Adding upstream version 2.2.0.upstream/2.2.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

29 files changed, 11242 insertions, 0 deletions

diff --git a/src/lib/http/tests/Makefile.am b/src/lib/http/tests/Makefile.am
new file mode 100644
index 0000000..c440fad
--- /dev/null
+++ b/src/lib/http/tests/Makefile.am
@@ -0,0 +1,78 @@
+SUBDIRS = .
+
+# Add to the tarball:
+EXTRA_DIST = testdata/empty
+EXTRA_DIST += testdata/hiddenp
+EXTRA_DIST += testdata/hiddens
+EXTRA_DIST += testdata/hiddenu
+
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES) $(CRYPTO_CFLAGS) $(CRYPTO_INCLUDES)
+TEST_CA_DIR = $(srcdir)/../../asiolink/testutils/ca
+AM_CPPFLAGS += -DTEST_DATA_BUILDDIR=\"$(TEST_CA_DIR)\"
+AM_CPPFLAGS += -DINSTALL_PROG=\"$(abs_top_srcdir)/install-sh\"
+AM_CPPFLAGS += -DDATA_DIR=\"$(abs_srcdir)/testdata\"
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+CLEANFILES = *.gcno *.gcda
+
+TESTS_ENVIRONMENT = \
+	$(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+TESTS =
+if HAVE_GTEST
+TESTS += libhttp_unittests
+
+libhttp_unittests_SOURCES  = basic_auth_unittests.cc
+libhttp_unittests_SOURCES += basic_auth_config_unittests.cc
+libhttp_unittests_SOURCES += connection_pool_unittests.cc
+libhttp_unittests_SOURCES += date_time_unittests.cc
+libhttp_unittests_SOURCES += http_header_unittests.cc
+libhttp_unittests_SOURCES += post_request_unittests.cc
+libhttp_unittests_SOURCES += post_request_json_unittests.cc
+libhttp_unittests_SOURCES += request_parser_unittests.cc
+libhttp_unittests_SOURCES += request_test.h
+libhttp_unittests_SOURCES += response_creator_unittests.cc
+libhttp_unittests_SOURCES += response_parser_unittests.cc
+libhttp_unittests_SOURCES += response_test.h
+libhttp_unittests_SOURCES += request_unittests.cc
+libhttp_unittests_SOURCES += response_unittests.cc
+libhttp_unittests_SOURCES += response_json_unittests.cc
+libhttp_unittests_SOURCES += run_unittests.cc
+libhttp_unittests_SOURCES += server_client_unittests.cc
+if HAVE_OPENSSL
+libhttp_unittests_SOURCES += tls_server_unittests.cc
+libhttp_unittests_SOURCES += tls_client_unittests.cc
+endif
+if HAVE_BOTAN_BOOST
+libhttp_unittests_SOURCES += tls_server_unittests.cc
+libhttp_unittests_SOURCES += tls_client_unittests.cc
+endif
+libhttp_unittests_SOURCES += url_unittests.cc
+libhttp_unittests_SOURCES += test_http_client.h
+libhttp_unittests_SOURCES += client_mt_unittests.cc
+libhttp_unittests_SOURCES += http_thread_pool_unittests.cc
+
+libhttp_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
+libhttp_unittests_CXXFLAGS = $(AM_CXXFLAGS)
+libhttp_unittests_LDFLAGS  = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
+
+libhttp_unittests_LDADD  = $(top_builddir)/src/lib/http/libkea-http.la
+libhttp_unittests_LDADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+libhttp_unittests_LDADD += $(top_builddir)/src/lib/testutils/libkea-testutils.la
+libhttp_unittests_LDADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+libhttp_unittests_LDADD += $(top_builddir)/src/lib/asiolink/testutils/libasiolinktest.la
+libhttp_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libhttp_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+libhttp_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+libhttp_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+libhttp_unittests_LDADD += $(LOG4CPLUS_LIBS)
+libhttp_unittests_LDADD += $(BOOST_LIBS) $(CRYPTO_LIBS) $(GTEST_LDADD)
+endif
+
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/lib/http/tests/Makefile.in b/src/lib/http/tests/Makefile.in
new file mode 100644
index 0000000..a1a5875
--- /dev/null
+++ b/src/lib/http/tests/Makefile.in
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+check: check-recursive
+all-am: Makefile $(PROGRAMS)
+installdirs: installdirs-recursive
+installdirs-am:
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/libhttp_unittests-basic_auth_config_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-basic_auth_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-client_mt_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-connection_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-date_time_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-http_header_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-http_thread_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-post_request_json_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-post_request_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-request_parser_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-request_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-response_creator_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-response_json_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-response_parser_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-response_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-server_client_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-tls_client_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-tls_server_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-url_unittests.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/libhttp_unittests-basic_auth_config_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-basic_auth_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-client_mt_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-connection_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-date_time_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-http_header_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-http_thread_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-post_request_json_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-post_request_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-request_parser_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-request_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-response_creator_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-response_json_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-response_parser_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-response_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-server_client_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-tls_client_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-tls_server_unittests.Po
+	-rm -f ./$(DEPDIR)/libhttp_unittests-url_unittests.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-TESTS check-am clean clean-generic \
+	clean-libtool clean-noinstPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/http/tests/basic_auth_config_unittests.cc b/src/lib/http/tests/basic_auth_config_unittests.cc
new file mode 100644
index 0000000..5df2170
--- /dev/null
+++ b/src/lib/http/tests/basic_auth_config_unittests.cc
@@ -0,0 +1,540 @@
+// Copyright (C) 2020-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <http/basic_auth_config.h>
+#include <testutils/gtest_utils.h>
+#include <testutils/test_to_element.h>
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::http;
+using namespace isc::test;
+using namespace std;
+
+namespace {
+
+string data_dir(DATA_DIR);
+
+// Test that basic auth client works as expected.
+TEST(BasicHttpAuthClientTest, basic) {
+    // Create a client.
+    ConstElementPtr ctx = Element::fromJSON("{ \"foo\": \"bar\" }");
+    BasicHttpAuthClient client("foo", "bar", ctx);
+
+    // Check it.
+    EXPECT_EQ("foo", client.getUser());
+    EXPECT_EQ("", client.getUserFile());
+    EXPECT_EQ("bar", client.getPassword());
+    EXPECT_EQ("", client.getPasswordFile());
+    EXPECT_FALSE(client.getPasswordFileOnly());
+    EXPECT_TRUE(ctx->equals(*client.getContext()));
+
+    // Check toElement.
+    ElementPtr expected = Element::createMap();
+    expected->set("user", Element::create(string("foo")));
+    expected->set("password", Element::create(string("bar")));
+    expected->set("user-context", ctx);
+    runToElementTest<BasicHttpAuthClient>(expected, client);
+}
+
+// Test that basic auth client with files works as expected.
+TEST(BasicHttpAuthClientTest, basicFiles) {
+    // Create a client.
+    ConstElementPtr ctx = Element::fromJSON("{ \"foo\": \"bar\" }");
+    BasicHttpAuthClient client("", "foo", "", "bar", false, ctx);
+
+    // Check it.
+    EXPECT_EQ("", client.getUser());
+    EXPECT_EQ("foo", client.getUserFile());
+    EXPECT_EQ("", client.getPassword());
+    EXPECT_EQ("bar", client.getPasswordFile());
+    EXPECT_FALSE(client.getPasswordFileOnly());
+    EXPECT_TRUE(ctx->equals(*client.getContext()));
+
+    // Check toElement.
+    ElementPtr expected = Element::createMap();
+    expected->set("user-file", Element::create(string("foo")));
+    expected->set("password-file", Element::create(string("bar")));
+    expected->set("user-context", ctx);
+    runToElementTest<BasicHttpAuthClient>(expected, client);
+}
+
+// Test that basic auth client with one file works as expected.
+TEST(BasicHttpAuthClientTest, basicOneFile) {
+    // Create a client.
+    ConstElementPtr ctx = Element::fromJSON("{ \"foo\": \"bar\" }");
+    BasicHttpAuthClient client("", "", "", "foobar", true, ctx);
+
+    // Check it.
+    EXPECT_EQ("", client.getUser());
+    EXPECT_EQ("", client.getUserFile());
+    EXPECT_EQ("", client.getPassword());
+    EXPECT_EQ("foobar", client.getPasswordFile());
+    EXPECT_TRUE(client.getPasswordFileOnly());
+    EXPECT_TRUE(ctx->equals(*client.getContext()));
+
+    // Check toElement.
+    ElementPtr expected = Element::createMap();
+    expected->set("password-file", Element::create(string("foobar")));
+    expected->set("user-context", ctx);
+    runToElementTest<BasicHttpAuthClient>(expected, client);
+}
+
+// Test that basic auth configuration works as expected.
+TEST(BasicHttpAuthConfigTest, basic) {
+    // Create a configuration.
+    BasicHttpAuthConfig config;
+
+    // Initial configuration is empty.
+    EXPECT_TRUE(config.empty());
+    EXPECT_TRUE(config.getRealm().empty());
+    EXPECT_TRUE(config.getDirectory().empty());
+    EXPECT_TRUE(config.getClientList().empty());
+    EXPECT_TRUE(config.getCredentialMap().empty());
+
+    // Set the realm, directory and user context.
+    EXPECT_NO_THROW(config.setRealm("my-realm"));
+    EXPECT_EQ("my-realm", config.getRealm());
+    EXPECT_NO_THROW(config.setDirectory("/tmp"));
+    EXPECT_EQ("/tmp", config.getDirectory());
+    ConstElementPtr horse = Element::fromJSON("{ \"value\": \"a horse\" }");
+    EXPECT_NO_THROW(config.setContext(horse));
+    EXPECT_TRUE(horse->equals(*config.getContext()));
+
+    // Add rejects user id with embedded ':'.
+    EXPECT_THROW(config.add("foo:", "", "bar", ""), BadValue);
+
+    // Add a client.
+    EXPECT_TRUE(config.empty());
+    ConstElementPtr ctx = Element::fromJSON("{ \"foo\": \"bar\" }");
+    EXPECT_NO_THROW(config.add("foo", "", "bar", "", false, ctx));
+    EXPECT_FALSE(config.empty());
+
+    // Check the client.
+    ASSERT_EQ(1, config.getClientList().size());
+    const BasicHttpAuthClient& client = config.getClientList().front();
+    EXPECT_EQ("foo", client.getUser());
+    EXPECT_EQ("bar", client.getPassword());
+    EXPECT_TRUE(ctx->equals(*client.getContext()));
+
+    // Check the credential.
+    ASSERT_NE(0, config.getCredentialMap().count("Zm9vOmJhcg=="));
+    string user;
+    EXPECT_NO_THROW(user = config.getCredentialMap().at("Zm9vOmJhcg=="));
+    EXPECT_EQ("foo", user);
+
+    // Check toElement.
+    ElementPtr expected = Element::createMap();
+    ElementPtr clients = Element::createList();
+    ElementPtr elem = Element::createMap();
+    elem->set("user", Element::create(string("foo")));
+    elem->set("password", Element::create(string("bar")));
+    elem->set("user-context", ctx);
+    clients->add(elem);
+    expected->set("type", Element::create(string("basic")));
+    expected->set("realm", Element::create(string("my-realm")));
+    expected->set("directory", Element::create(string("/tmp")));
+    expected->set("user-context", horse);
+    expected->set("clients", clients);
+    runToElementTest<BasicHttpAuthConfig>(expected, config);
+
+    // Add a second client and test it.
+    EXPECT_NO_THROW(config.add("test", "", "123\xa3", ""));
+    ASSERT_EQ(2, config.getClientList().size());
+    EXPECT_EQ("foo", config.getClientList().front().getUser());
+    EXPECT_EQ("test", config.getClientList().back().getUser());
+    ASSERT_NE(0, config.getCredentialMap().count("dGVzdDoxMjPCow=="));
+
+    // Check clear.
+    config.clear();
+    EXPECT_TRUE(config.empty());
+    expected->set("clients", Element::createList());
+    runToElementTest<BasicHttpAuthConfig>(expected, config);
+
+    // Add clients again.
+    EXPECT_NO_THROW(config.add("test", "", "123\xa3", ""));
+    EXPECT_NO_THROW(config.add("foo", "", "bar", "", false, ctx));
+
+    // Check that toElement keeps add order.
+    ElementPtr elem0 = Element::createMap();
+    elem0->set("user", Element::create(string("test")));
+    elem0->set("password", Element::create(string("123\xa3")));
+    clients = Element::createList();
+    clients->add(elem0);
+    clients->add(elem);
+    expected->set("clients", clients);
+    runToElementTest<BasicHttpAuthConfig>(expected, config);
+}
+
+// Test that basic auth configuration with files works as expected.
+TEST(BasicHttpAuthConfigTest, basicFiles) {
+    // Create a configuration.
+    BasicHttpAuthConfig config;
+
+    // Set the realm, directory and user context.
+    EXPECT_NO_THROW(config.setRealm("my-realm"));
+    EXPECT_EQ("my-realm", config.getRealm());
+    EXPECT_NO_THROW(config.setDirectory(data_dir));
+    EXPECT_EQ(data_dir, config.getDirectory());
+    ConstElementPtr horse = Element::fromJSON("{ \"value\": \"a horse\" }");
+    EXPECT_NO_THROW(config.setContext(horse));
+    EXPECT_TRUE(horse->equals(*config.getContext()));
+
+    // ':' in user id check is done during parsing
+
+    // Add a client.
+    EXPECT_TRUE(config.empty());
+    ConstElementPtr ctx = Element::fromJSON("{ \"foo\": \"bar\" }");
+    EXPECT_NO_THROW(config.add("foo", "", "", "hiddenp", false, ctx));
+    EXPECT_FALSE(config.empty());
+
+    // Check the client.
+    ASSERT_EQ(1, config.getClientList().size());
+    const BasicHttpAuthClient& client = config.getClientList().front();
+    EXPECT_EQ("foo", client.getUser());
+    EXPECT_EQ("", client.getUserFile());
+    EXPECT_EQ("", client.getPassword());
+    EXPECT_EQ("hiddenp", client.getPasswordFile());
+    EXPECT_FALSE(client.getPasswordFileOnly());
+    EXPECT_TRUE(ctx->equals(*client.getContext()));
+
+    // Check toElement.
+    ElementPtr expected = Element::createMap();
+    ElementPtr clients = Element::createList();
+    ElementPtr elem = Element::createMap();
+    elem->set("user", Element::create(string("foo")));
+    elem->set("password-file", Element::create(string("hiddenp")));
+    elem->set("user-context", ctx);
+    clients->add(elem);
+    expected->set("type", Element::create(string("basic")));
+    expected->set("realm", Element::create(string("my-realm")));
+    expected->set("directory", Element::create(data_dir));
+    expected->set("user-context", horse);
+    expected->set("clients", clients);
+    runToElementTest<BasicHttpAuthConfig>(expected, config);
+
+    // Add a second client and test it.
+    EXPECT_NO_THROW(config.add("", "hiddenu", "", "hiddenp"));
+    ASSERT_EQ(2, config.getClientList().size());
+    EXPECT_EQ("foo", config.getClientList().front().getUser());
+    EXPECT_EQ("hiddenu", config.getClientList().back().getUserFile());
+
+    // Check clear.
+    config.clear();
+    EXPECT_TRUE(config.empty());
+    expected->set("clients", Element::createList());
+    runToElementTest<BasicHttpAuthConfig>(expected, config);
+
+    // Add clients again.
+    EXPECT_NO_THROW(config.add("", "hiddenu", "", "hiddenp"));
+    EXPECT_NO_THROW(config.add("foo", "", "", "hiddenp", false, ctx));
+
+    // Check that toElement keeps add order.
+    ElementPtr elem0 = Element::createMap();
+    elem0->set("user-file", Element::create(string("hiddenu")));
+    elem0->set("password-file", Element::create(string("hiddenp")));
+    clients = Element::createList();
+    clients->add(elem0);
+    clients->add(elem);
+    expected->set("clients", clients);
+    runToElementTest<BasicHttpAuthConfig>(expected, config);
+}
+
+// Test that basic auth configuration parses.
+TEST(BasicHttpAuthConfigTest, parse) {
+    BasicHttpAuthConfig config;
+    ElementPtr cfg;
+
+    // No config is accepted.
+    EXPECT_NO_THROW(config.parse(cfg));
+    EXPECT_TRUE(config.empty());
+    EXPECT_TRUE(config.getClientList().empty());
+    EXPECT_TRUE(config.getCredentialMap().empty());
+    ElementPtr expected = Element::createMap();
+    expected->set("type", Element::create(string("basic")));
+    expected->set("realm", Element::create(string("")));
+    expected->set("directory", Element::create(string("")));
+    expected->set("clients", Element::createList());
+    runToElementTest<BasicHttpAuthConfig>(expected, config);
+
+    // The config must be a map.
+    cfg = Element::createList();
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "authentication must be a map (:0:0)");
+
+    // The type must be present.
+    cfg = Element::createMap();
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "type is required in authentication (:0:0)");
+
+    // The type must be a string.
+    cfg->set("type", Element::create(true));
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "type must be a string (:0:0)");
+
+    // The type must be basic.
+    cfg->set("type", Element::create(string("foobar")));
+    string errmsg = "only basic HTTP authentication is supported: type is ";
+    errmsg += "'foobar' not 'basic' (:0:0)";
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError, errmsg);
+    cfg->set("type", Element::create(string("basic")));
+    EXPECT_NO_THROW(config.parse(cfg));
+
+    // The realm must be a string.
+    cfg->set("realm", Element::createList());
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "realm must be a string (:0:0)");
+    cfg->set("realm", Element::create(string("my-realm")));
+    EXPECT_NO_THROW(config.parse(cfg));
+
+    // The directory must be a string.
+    cfg->set("directory", Element::createMap());
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "directory must be a string (:0:0)");
+    cfg->set("directory", Element::create(data_dir));
+    EXPECT_NO_THROW(config.parse(cfg));
+
+    // The user context must be a map.
+    ElementPtr ctx = Element::createList();
+    cfg->set("user-context", ctx);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "user-context must be a map (:0:0)");
+    ctx = Element::fromJSON("{ \"value\": \"a horse\" }");
+    cfg->set("user-context", ctx);
+    EXPECT_NO_THROW(config.parse(cfg));
+
+    // Clients must be a list.
+    ElementPtr clients_cfg = Element::createMap();
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "clients must be a list (:0:0)");
+
+    // The client config must be a map.
+    clients_cfg = Element::createList();
+    ElementPtr client_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "clients items must be maps (:0:0)");
+
+    // The user parameter is mandatory in client config
+    // without a password file.
+    client_cfg = Element::createMap();
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "user is required in clients items (:0:0)");
+
+    // The user parameter must be a string.
+    ElementPtr user_cfg = Element::create(1);
+    client_cfg = Element::createMap();
+    client_cfg->set("user", user_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "user must be a string (:0:0)");
+
+    // The user parameter must not be empty.
+    user_cfg = Element::create(string(""));
+    client_cfg = Element::createMap();
+    client_cfg->set("user", user_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "user must not be empty (:0:0)");
+
+    // The user parameter must not contain ':'.
+    user_cfg = Element::create(string("foo:bar"));
+    client_cfg = Element::createMap();
+    client_cfg->set("user", user_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "user must not contain a ':': 'foo:bar' (:0:0)");
+
+    // The user-file parameter must be a string.
+    ElementPtr user_file_cfg = Element::create(1);
+    client_cfg = Element::createMap();
+    client_cfg->set("user-file", user_file_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "user-file must be a string (:0:0)");
+
+    // The user and user-file parameters are incompatible.
+    client_cfg = Element::createMap();
+    client_cfg->set("user", user_cfg);
+    client_cfg->set("user-file", user_file_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "user (:0:0) and user-file (:0:0) are "
+                     "mutually exclusive");
+
+    // The user-file parameter must not be empty.
+    user_file_cfg = Element::create(string("empty"));
+    client_cfg = Element::createMap();
+    client_cfg->set("user-file", user_file_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "user must not be empty from user-file "
+                     "'empty' (:0:0)");
+
+    // The user-file parameter must not contain ':'.
+    user_file_cfg = Element::create(string("hiddens"));
+    client_cfg = Element::createMap();
+    client_cfg->set("user-file", user_file_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "user must not contain a ':' from user-file "
+                     "'hiddens' (:0:0)");
+
+    // Password is not required.
+    user_cfg = Element::create(string("foo"));
+    client_cfg = Element::createMap();
+    client_cfg->set("user", user_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_NO_THROW(config.parse(cfg));
+    ASSERT_EQ(1, config.getClientList().size());
+    EXPECT_EQ("", config.getClientList().front().getPassword());
+    config.clear();
+
+    // The password parameter must be a string.
+    ElementPtr password_cfg = Element::create(1);
+    client_cfg = Element::createMap();
+    client_cfg->set("password", password_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "password must be a string (:0:0)");
+
+    // Empty password is accepted.
+    password_cfg = Element::create(string(""));
+    client_cfg = Element::createMap();
+    client_cfg->set("user", user_cfg);
+    client_cfg->set("password", password_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_NO_THROW(config.parse(cfg));
+    ASSERT_EQ(1, config.getClientList().size());
+    EXPECT_EQ("", config.getClientList().front().getPassword());
+    config.clear();
+
+    // The password-file parameter must be a string.
+    ElementPtr password_file_cfg = Element::create(1);
+    client_cfg = Element::createMap();
+    // user is not required when password-file is here.
+    client_cfg->set("password-file", password_file_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "password-file must be a string (:0:0)");
+
+    // The password and password-file parameters are incompatible.
+    client_cfg = Element::createMap();
+    client_cfg->set("user", user_cfg);
+    client_cfg->set("password", password_cfg);
+    client_cfg->set("password-file", password_file_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "password (:0:0) and password-file (:0:0) are "
+                     "mutually exclusive");
+
+    // Empty password-file is accepted.
+    password_file_cfg = Element::create(string("empty"));
+    client_cfg = Element::createMap();
+    client_cfg->set("user", user_cfg);
+    client_cfg->set("password-file", password_file_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_NO_THROW(config.parse(cfg));
+    ASSERT_EQ(1, config.getClientList().size());
+    EXPECT_EQ("", config.getClientList().front().getPassword());
+    config.clear();
+
+    // password-file is enough.
+    password_file_cfg = Element::create(string("hiddens"));
+    client_cfg = Element::createMap();
+    client_cfg->set("password-file", password_file_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_NO_THROW(config.parse(cfg));
+    ASSERT_EQ(1, config.getClientList().size());
+    EXPECT_EQ("test", config.getClientList().front().getPassword());
+    config.clear();
+
+    // password-file only requires a ':' in the content.
+    password_file_cfg = Element::create(string("hiddenp"));
+    client_cfg = Element::createMap();
+    client_cfg->set("password-file", password_file_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "can't find the user id part in password-file "
+                     "'hiddenp' (:0:0)");
+
+    // User context must be a map.
+    password_cfg = Element::create(string("bar"));
+    ctx = Element::createList();
+    client_cfg = Element::createMap();
+    client_cfg->set("user", user_cfg);
+    client_cfg->set("password", password_cfg);
+    client_cfg->set("user-context", ctx);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_THROW_MSG(config.parse(cfg), DhcpConfigError,
+                     "user-context must be a map (:0:0)");
+
+    // Check a working not empty config.
+    ctx = Element::fromJSON("{ \"foo\": \"bar\" }");
+    client_cfg = Element::createMap();
+    client_cfg->set("user", user_cfg);
+    client_cfg->set("password", password_cfg);
+    client_cfg->set("user-context", ctx);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_NO_THROW(config.parse(cfg));
+    runToElementTest<BasicHttpAuthConfig>(cfg, config);
+
+    // Check a working not empty config with files.
+    config.clear();
+    client_cfg = Element::createMap();
+    user_file_cfg = Element::create(string("hiddenu"));
+    client_cfg->set("user-file", user_file_cfg);
+    client_cfg->set("password-file", password_file_cfg);
+    clients_cfg = Element::createList();
+    clients_cfg->add(client_cfg);
+    cfg->set("clients", clients_cfg);
+    EXPECT_NO_THROW(config.parse(cfg));
+    runToElementTest<BasicHttpAuthConfig>(cfg, config);
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/http/tests/basic_auth_unittests.cc b/src/lib/http/tests/basic_auth_unittests.cc
new file mode 100644
index 0000000..1c2693d
--- /dev/null
+++ b/src/lib/http/tests/basic_auth_unittests.cc
@@ -0,0 +1,65 @@
+// Copyright (C) 2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <http/basic_auth.h>
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::http;
+
+namespace {
+
+// Test that user name with a colon is rejected.
+TEST(BasicHttpAuthTest, userColon) {
+    BasicHttpAuthPtr basic_auth;
+    EXPECT_THROW(basic_auth.reset(new BasicHttpAuth("foo:bar", "")), BadValue);
+}
+
+// Test that secret without a colon is rejected.
+TEST(BasicHttpAuthTest, secretNoColon) {
+    BasicHttpAuthPtr basic_auth;
+    EXPECT_THROW(basic_auth.reset(new BasicHttpAuth("foo-bar")), BadValue);
+}
+
+// Test that valid user and password work.
+TEST(BasicHttpAuthTest, user) {
+    BasicHttpAuthPtr basic_auth;
+    EXPECT_NO_THROW(basic_auth.reset(new BasicHttpAuth("foo", "bar")));
+    ASSERT_TRUE(basic_auth);
+    EXPECT_EQ("foo:bar", basic_auth->getSecret());
+    EXPECT_EQ("Zm9vOmJhcg==", basic_auth->getCredential());
+}
+
+// Test that valid secret work.
+TEST(BasicHttpAuthTest, secret) {
+    BasicHttpAuthPtr basic_auth;
+    EXPECT_NO_THROW(basic_auth.reset(new BasicHttpAuth("foo:bar")));
+    ASSERT_TRUE(basic_auth);
+    EXPECT_EQ("foo:bar", basic_auth->getSecret());
+    EXPECT_EQ("Zm9vOmJhcg==", basic_auth->getCredential());
+}
+
+// Test that secret is encoded in UTF-8.
+TEST(BasicHttpAuthTest, utf8) {
+    BasicHttpAuthPtr basic_auth;
+    EXPECT_NO_THROW(basic_auth.reset(new BasicHttpAuth("foo\n", "b\ar")));
+    ASSERT_TRUE(basic_auth);
+    EXPECT_EQ("foo\n:b\ar", basic_auth->getSecret());
+    EXPECT_EQ("Zm9vCjpiB3I=", basic_auth->getCredential());
+}
+
+// Test that a header context for basic HTTP authentication can be created.
+TEST(BasicHttpAuthTest, headerContext) {
+    BasicHttpAuthPtr basic_auth;
+    EXPECT_NO_THROW(basic_auth.reset(new BasicHttpAuth("foo", "bar")));
+    ASSERT_TRUE(basic_auth);
+    BasicAuthHttpHeaderContext ctx(*basic_auth);
+    EXPECT_EQ("Authorization", ctx.name_);
+    EXPECT_EQ("Basic Zm9vOmJhcg==", ctx.value_);
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/http/tests/client_mt_unittests.cc b/src/lib/http/tests/client_mt_unittests.cc
new file mode 100644
index 0000000..0d8944a
--- /dev/null
+++ b/src/lib/http/tests/client_mt_unittests.cc
@@ -0,0 +1,1042 @@
+// Copyright (C) 2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/interval_timer.h>
+#include <cc/data.h>
+#include <http/client.h>
+#include <http/listener.h>
+#include <http/post_request_json.h>
+#include <http/response_creator.h>
+#include <http/response_creator_factory.h>
+#include <http/response_json.h>
+#include <http/url.h>
+#include <util/multi_threading_mgr.h>
+#include <testutils/gtest_utils.h>
+
+#include <boost/asio/ip/tcp.hpp>
+#include <boost/pointer_cast.hpp>
+#include <gtest/gtest.h>
+
+#include <functional>
+#include <sstream>
+#include <string>
+
+using namespace isc;
+using namespace isc::asiolink;
+using namespace isc::data;
+using namespace isc::http;
+using namespace isc::util;
+namespace ph = std::placeholders;
+
+namespace {
+
+/// @brief IP address to which HTTP service is bound.
+const std::string SERVER_ADDRESS = "127.0.0.1";
+
+/// @brief Port number to which HTTP service is bound.
+const unsigned short SERVER_PORT = 18123;
+
+/// @brief Test timeout (ms).
+const long TEST_TIMEOUT = 10000;
+
+/// @brief Container request/response pair handled by a given thread.
+struct ClientRR {
+    /// @brief Thread id of the client thread handling the request as a string.
+    std::string thread_id_;
+
+    /// @brief HTTP request submitted by the client thread.
+    PostHttpRequestJsonPtr request_;
+
+    /// @brief HTTP response received by the client thread.
+    HttpResponseJsonPtr response_;
+};
+
+/// @brief Pointer to a ClientRR instance.
+typedef boost::shared_ptr<ClientRR> ClientRRPtr;
+
+/// @brief Implementation of the @ref HttpResponseCreator.
+///
+/// Creates a response to a request containing body content
+/// as follows:
+///
+/// ```
+///     { "sequence" : nnnn }
+/// ```
+///
+/// The response will include the sequence number of the request
+/// as well as the server port passed into the creator's constructor:
+///
+/// ```
+///     { "sequence": nnnn, "server-port": xxxx }
+/// ```
+class TestHttpResponseCreator : public HttpResponseCreator {
+public:
+    /// @brief Constructor
+    ///
+    /// @param server_port integer value the server listens upon, it is
+    /// echoed back in responses as "server-port".
+    TestHttpResponseCreator(uint16_t server_port)
+    : server_port_(server_port) { }
+
+    /// @brief Create a new request.
+    ///
+    /// @return Pointer to the new instance of the @ref HttpRequest.
+    virtual HttpRequestPtr
+    createNewHttpRequest() const {
+        return (HttpRequestPtr(new PostHttpRequestJson()));
+    }
+
+private:
+    /// @brief Creates HTTP response.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @param status_code status code to include in the response.
+    ///
+    /// @return Pointer to the generated HTTP response.
+    virtual HttpResponsePtr
+    createStockHttpResponse(const HttpRequestPtr& request,
+                            const HttpStatusCode& status_code) const {
+        // The request hasn't been finalized so the request object
+        // doesn't contain any information about the HTTP version number
+        // used. But, the context should have this data (assuming the
+        // HTTP version is parsed OK).
+        HttpVersion http_version(request->context()->http_version_major_,
+                                 request->context()->http_version_minor_);
+        // This will generate the response holding JSON content.
+        HttpResponseJsonPtr response(new HttpResponseJson(http_version, status_code));
+        response->finalize();
+        return (response);
+    }
+
+    /// @brief Creates HTTP response.
+    ///
+    /// Generates a response which echoes the requests sequence
+    /// number as well as the creator's server port value. Responses
+    /// should appear as follows:
+    ///
+    /// ```
+    ///     { "sequence" : nnnn }
+    /// ```
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP OK response with no content.
+    virtual HttpResponsePtr
+    createDynamicHttpResponse(HttpRequestPtr request) {
+        // Request must always be JSON.
+        PostHttpRequestJsonPtr request_json =
+            boost::dynamic_pointer_cast<PostHttpRequestJson>(request);
+        if (!request_json) {
+            return (createStockHttpResponse(request, HttpStatusCode::BAD_REQUEST));
+        }
+
+        // Extract the sequence from the request.
+        ConstElementPtr sequence = request_json->getJsonElement("sequence");
+        if (!sequence) {
+            return (createStockHttpResponse(request, HttpStatusCode::BAD_REQUEST));
+        }
+
+        // Create the response.
+        HttpResponseJsonPtr response(new HttpResponseJson(request->getHttpVersion(),
+                                                          HttpStatusCode::OK));
+        // Construct the body.
+        ElementPtr body = Element::createMap();
+        body->set("server-port", Element::create(server_port_));
+        body->set("sequence", sequence);
+
+        // Echo request body back in the response.
+        response->setBodyAsJson(body);
+
+        response->finalize();
+        return (response);
+    }
+
+    /// @brief Port upon which this creator's server is listening.
+    ///
+    /// The intent is to use the value to determine which server generated
+    /// a given response.
+    uint16_t server_port_;
+};
+
+/// @brief Implementation of the test @ref HttpResponseCreatorFactory.
+///
+/// This factory class creates @ref TestHttpResponseCreator instances.
+class TestHttpResponseCreatorFactory : public HttpResponseCreatorFactory {
+public:
+
+    /// @brief Constructor
+    ///
+    /// @param server_port port upon with the server is listening. This
+    /// value will be included in responses such that each response
+    /// can be attributed to a specific server.
+    TestHttpResponseCreatorFactory(uint16_t server_port)
+    : server_port_(server_port) {};
+
+    /// @brief Creates @ref TestHttpResponseCreator instance.
+    virtual HttpResponseCreatorPtr create() const {
+        HttpResponseCreatorPtr response_creator(new TestHttpResponseCreator(server_port_));
+        return (response_creator);
+    }
+
+    /// @brief Port upon which this factory's server is listening.
+    ///
+    /// The intent is to use the value to determine which server generated
+    /// a given response.
+    uint16_t server_port_;
+};
+
+/// @brief Test fixture class for testing threading modes of HTTP client.
+class MultiThreadingHttpClientTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    MultiThreadingHttpClientTest()
+        : io_service_(), client_(), listener_(), factory_(), listeners_(), factories_(),
+          test_timer_(io_service_), num_threads_(0), num_batches_(0), num_listeners_(0),
+          expected_requests_(0), num_in_progress_(0), num_finished_(0), paused_(false),
+          pause_cnt_(0) {
+        test_timer_.setup(std::bind(&MultiThreadingHttpClientTest::timeoutHandler, this, true),
+                          TEST_TIMEOUT, IntervalTimer::ONE_SHOT);
+        MultiThreadingMgr::instance().setMode(true);
+    }
+
+    /// @brief Destructor.
+    ~MultiThreadingHttpClientTest() {
+        // Stop the client.
+        if (client_) {
+            client_->stop();
+        }
+
+        // Stop all listeners.
+        for (const auto& listener : listeners_) {
+            listener->stop();
+        }
+
+        MultiThreadingMgr::instance().setMode(false);
+    }
+
+    /// @brief Callback function to invoke upon test timeout.
+    ///
+    /// It stops the IO service and reports test timeout.
+    ///
+    /// @param fail_on_timeout Specifies if test failure should be reported.
+    void timeoutHandler(const bool fail_on_timeout) {
+        if (fail_on_timeout) {
+            ADD_FAILURE() << "Timeout occurred while running the test!";
+        }
+        io_service_.stop();
+    }
+
+    /// @brief Runs the test's IOService until the desired number of requests
+    /// have been carried out or the test fails.
+    void runIOService(size_t request_limit) {
+        while (getRRCount() < request_limit) {
+            // Always call reset() before we call run();
+            io_service_.restart();
+
+            // Run until a client stops the service.
+            io_service_.run();
+        }
+    }
+
+    /// @brief Creates an HTTP request with JSON body.
+    ///
+    /// It includes a JSON parameter with a specified value.
+    ///
+    /// @param parameter_name JSON parameter to be included.
+    /// @param value JSON parameter value.
+    /// @param version HTTP version to be used. Default is HTTP/1.1.
+    template<typename ValueType>
+    PostHttpRequestJsonPtr createRequest(const std::string& parameter_name,
+                                         const ValueType& value,
+                                         const HttpVersion& version = HttpVersion(1, 1)) {
+        // Create POST request with JSON body.
+        PostHttpRequestJsonPtr request(new PostHttpRequestJson(HttpRequest::Method::HTTP_POST,
+                                                               "/boo", version));
+        // Body is a map with a specified parameter included.
+        ElementPtr body = Element::createMap();
+        body->set(parameter_name, Element::create(value));
+        request->setBodyAsJson(body);
+        try {
+            request->finalize();
+        } catch (const std::exception& ex) {
+            ADD_FAILURE() << "failed to create request: " << ex.what();
+        }
+
+        return (request);
+    }
+
+    /// @brief Test that worker threads are not permitted to change thread pool
+    /// state.
+    void testIllegalThreadPoolActions() {
+        ASSERT_THROW(client_->start(), MultiThreadingInvalidOperation);
+        ASSERT_THROW(client_->pause(), MultiThreadingInvalidOperation);
+        ASSERT_THROW(client_->resume(), MultiThreadingInvalidOperation);
+    }
+
+    /// @brief Initiates a single HTTP request.
+    ///
+    /// Constructs an HTTP post whose body is a JSON map containing a
+    /// single integer element, "sequence".
+    ///
+    /// The request completion handler will block each requesting thread
+    /// until the number of in-progress threads reaches the number of
+    /// threads in the pool. At that point, the handler will unblock
+    /// until all threads have finished preparing their response and are
+    /// ready to return. The handler will then notify all pending threads
+    /// and invoke stop() on the test's main IO service thread.
+    ///
+    /// @param sequence value for the integer element, "sequence",
+    /// to send in the request.
+    void startRequest(int sequence, int port_offset = 0) {
+        // Create the URL on which the server can be reached.
+        std::stringstream ss;
+        ss << "http://" << SERVER_ADDRESS << ":" << (SERVER_PORT + port_offset);
+        Url url(ss.str());
+
+        // Initiate request to the server.
+        PostHttpRequestJsonPtr request_json = createRequest("sequence", sequence);
+        HttpResponseJsonPtr response_json = boost::make_shared<HttpResponseJson>();
+        ASSERT_NO_THROW(client_->asyncSendRequest(url, TlsContextPtr(),
+                                                  request_json, response_json,
+            [this, request_json, response_json](const boost::system::error_code& ec,
+                                                const HttpResponsePtr&,
+                                                const std::string&) {
+            // Bail on an error.
+            ASSERT_FALSE(ec) << "asyncSendRequest failed, ec: " << ec;
+
+            // Wait here until we have as many in progress as we have threads.
+            {
+                std::unique_lock<std::mutex> lck(test_mutex_);
+                ++num_in_progress_;
+                if (num_threads_ == 0 || num_in_progress_ == num_threads_) {
+                    // Everybody has one, let's go.
+                    num_finished_ = 0;
+                    test_cv_.notify_all();
+                } else {
+                    // I'm ready but others aren't wait here.
+                    bool ret = test_cv_.wait_for(lck, std::chrono::seconds(10),
+                                                 [&]() { return (num_in_progress_ == num_threads_); });
+                    if (!ret) {
+                        ADD_FAILURE() << "clients failed to start work";
+                    }
+                }
+            }
+
+            // If running on multiple threads, threads should be prohibited from
+            // changing the thread pool state.
+            if (num_threads_) {
+                testIllegalThreadPoolActions();
+            }
+
+            // Get stringified thread-id.
+            std::stringstream ss;
+            ss << std::this_thread::get_id();
+
+            // Create the ClientRR.
+            ClientRRPtr clientRR(new ClientRR());
+            clientRR->thread_id_ = ss.str();
+            clientRR->request_ = request_json;
+            clientRR->response_ = response_json;
+
+            // Wait here until we have as many ready to finish as we have threads.
+            {
+                std::unique_lock<std::mutex> lck(test_mutex_);
+                ++num_finished_;
+                clientRRs_.push_back(clientRR);
+                if (num_threads_ == 0 || num_finished_ == num_threads_) {
+                    // We're all done, notify the others and finish.
+                    num_in_progress_ = 0;
+                    test_cv_.notify_all();
+                    // Stop the test's IOService.
+                    io_service_.stop();
+                } else {
+                    // I'm done but others aren't wait here.
+                    bool ret = test_cv_.wait_for(lck, std::chrono::seconds(10),
+                                                 [&]() { return (num_finished_ == num_threads_); });
+                    if (!ret) {
+                        ADD_FAILURE() << "clients failed to finish work";
+                    }
+                }
+            }
+        }));
+    }
+
+    /// @brief Initiates a single HTTP request.
+    ///
+    /// Constructs an HTTP post whose body is a JSON map containing a
+    /// single integer element, "sequence".
+    ///
+    /// The request completion handler simply constructs the response,
+    /// and adds it the list of completed request/responses. If the
+    /// number of completed requests has reached the expected number
+    /// it stops the test IOService.
+    ///
+    /// @param sequence value for the integer element, "sequence",
+    /// to send in the request.
+    void startRequestSimple(int sequence, int port_offset = 0) {
+        // Create the URL on which the server can be reached.
+        std::stringstream ss;
+        ss << "http://" << SERVER_ADDRESS << ":" << (SERVER_PORT + port_offset);
+        Url url(ss.str());
+
+        // Initiate request to the server.
+        PostHttpRequestJsonPtr request_json = createRequest("sequence", sequence);
+        HttpResponseJsonPtr response_json = boost::make_shared<HttpResponseJson>();
+        ASSERT_NO_THROW(client_->asyncSendRequest(url, TlsContextPtr(),
+                                                  request_json, response_json,
+            [this, request_json, response_json](const boost::system::error_code& ec,
+                                                const HttpResponsePtr&,
+                                                const std::string&) {
+            // Bail on an error.
+            ASSERT_FALSE(ec) << "asyncSendRequest failed, ec: " << ec;
+
+            // Get stringified thread-id.
+            std::stringstream ss;
+            ss << std::this_thread::get_id();
+
+            // Create the ClientRR.
+            ClientRRPtr clientRR(new ClientRR());
+            clientRR->thread_id_ = ss.str();
+            clientRR->request_ = request_json;
+            clientRR->response_ = response_json;
+
+            {
+                std::unique_lock<std::mutex> lck(test_mutex_);
+                clientRRs_.push_back(clientRR);
+                ++num_finished_;
+                if ((num_finished_ >= expected_requests_) && !io_service_.stopped()) {
+                    io_service_.stop();
+                }
+            }
+
+        }));
+    }
+
+    /// @brief Carries out HTTP requests via HttpClient to HTTP listener(s).
+    ///
+    /// This function creates one HttpClient with the given number
+    /// of threads and then the given number of HttpListeners. It then
+    /// initiates the given number of request batches where each batch
+    /// contains one request per thread per listener.
+    ///
+    /// Then it iteratively runs the test's IOService until all
+    /// the requests have been responded to, an error occurs, or the
+    /// test times out.
+    ///
+    /// Each request carries a single integer element, "sequence", which
+    /// uniquely identifies the request. Each response is expected to
+    /// contain this value echoed back along with the listener's server
+    /// port number. Thus each response can be matched to it's request
+    /// and to the listener that handled the request.
+    ///
+    /// After all requests have been conducted, the function verifies
+    /// that:
+    ///
+    /// 1. The number of requests conducted is correct
+    /// 2. The sequence numbers in request-response pairs match
+    /// 3. Each client thread handled the same number of requests
+    /// 4. Each listener handled the same number of requests
+    ///
+    /// @param num_threads number of threads the HttpClient should use.
+    /// A value of 0 puts the HttpClient in single-threaded mode.
+    /// @param num_batches number of batches of requests that should be
+    /// conducted.
+    /// @param num_listeners number of HttpListeners to create. Defaults
+    /// to 1.
+    void threadRequestAndReceive(size_t num_threads, size_t num_batches,
+                                 size_t num_listeners = 1) {
+        ASSERT_TRUE(num_batches);
+        ASSERT_TRUE(num_listeners);
+        num_threads_ = num_threads;
+        num_batches_ = num_batches;
+        num_listeners_ = num_listeners;
+
+        // Client in ST is, in effect, 1 thread.
+        size_t effective_threads = (num_threads_ == 0 ? 1 : num_threads_);
+
+        // Calculate the expected number of requests.
+        expected_requests_ = (num_batches_ * num_listeners_ * effective_threads);
+
+        for (auto i = 0; i < num_listeners_; ++i) {
+            // Make a factory
+            HttpResponseCreatorFactoryPtr factory(new TestHttpResponseCreatorFactory(SERVER_PORT + i));
+            factories_.push_back(factory);
+
+            // Need to create a Listener on
+            HttpListenerPtr listener(new HttpListener(io_service_,
+                                                      IOAddress(SERVER_ADDRESS), (SERVER_PORT + i),
+                                                      TlsContextPtr(), factory,
+                                                      HttpListener::RequestTimeout(10000),
+                                                      HttpListener::IdleTimeout(10000)));
+            listeners_.push_back(listener);
+
+            // Start the server.
+            ASSERT_NO_THROW(listener->start());
+        }
+
+        // Create an MT client with num_threads
+        ASSERT_NO_THROW_LOG(client_.reset(new HttpClient(io_service_, num_threads)));
+        ASSERT_TRUE(client_);
+
+        if (num_threads_ == 0) {
+            // If we single-threaded client should not have it's own IOService.
+            ASSERT_FALSE(client_->getThreadIOService());
+        } else {
+            // If we multi-threaded client should have it's own IOService.
+            ASSERT_TRUE(client_->getThreadIOService());
+        }
+
+        // Verify the pool size and number of threads are as expected.
+        ASSERT_EQ(client_->getThreadPoolSize(), num_threads);
+        ASSERT_EQ(client_->getThreadCount(), num_threads);
+
+        // Start the requisite number of requests:
+        //   batch * listeners * threads.
+        int sequence = 0;
+        for (auto b = 0; b < num_batches; ++b) {
+            for (auto l = 0; l < num_listeners_; ++l) {
+                for (auto t = 0; t < effective_threads; ++t) {
+                    startRequest(++sequence, l);
+                }
+            }
+        }
+
+        // Loop until the clients are done, an error occurs, or the time runs out.
+        runIOService(expected_requests_);
+
+        // Client should stop without issue.
+        ASSERT_NO_THROW(client_->stop());
+
+        // Listeners should stop without issue.
+        for (const auto& listener : listeners_) {
+            ASSERT_NO_THROW(listener->stop());
+        }
+
+        // We should have a response for each request.
+        ASSERT_EQ(getRRCount(), expected_requests_);
+
+        // Create a map to track number of responses for each client thread.
+        std::map<std::string, int> responses_per_thread;
+
+        // Create a map to track number of responses for each listener port.
+        std::map<uint16_t, int> responses_per_listener;
+
+        // Get the stringified thread-id of the test's main thread.
+        std::stringstream ss;
+        ss << std::this_thread::get_id();
+        std::string main_thread_id = ss.str();
+
+        // Iterate over the client request/response pairs.
+        for (auto const& clientRR : clientRRs_) {
+            // Make sure it's whole.
+            ASSERT_FALSE(clientRR->thread_id_.empty());
+            ASSERT_TRUE(clientRR->request_);
+            ASSERT_TRUE(clientRR->response_);
+
+            // Request should contain an integer sequence number.
+            int request_sequence;
+            ConstElementPtr sequence = clientRR->request_->getJsonElement("sequence");
+            ASSERT_TRUE(sequence);
+            ASSERT_NO_THROW(request_sequence = sequence->intValue());
+
+            // Response should contain an integer sequence number.
+            int response_sequence;
+            sequence = clientRR->response_->getJsonElement("sequence");
+            ASSERT_TRUE(sequence);
+            ASSERT_NO_THROW(response_sequence = sequence->intValue());
+
+            // Request and Response sequence numbers should match.
+            ASSERT_EQ(request_sequence, response_sequence);
+
+            ConstElementPtr server_port_elem = clientRR->response_->getJsonElement("server-port");
+            ASSERT_TRUE(server_port_elem);
+            uint16_t server_port = server_port_elem->intValue();
+
+            if (num_threads_ == 0) {
+                // For ST mode thread id should always be the main thread.
+                ASSERT_EQ(clientRR->thread_id_, main_thread_id);
+            } else {
+                // For MT mode the thread id should never be the main thread.
+                ASSERT_NE(clientRR->thread_id_, main_thread_id);
+            }
+
+            // Bump the response count for the given client thread-id.
+            auto rit = responses_per_thread.find(clientRR->thread_id_);
+            if (rit != responses_per_thread.end()) {
+                responses_per_thread[clientRR->thread_id_] = rit->second + 1;
+            } else {
+                responses_per_thread[clientRR->thread_id_] = 1;
+            }
+
+            // Bump the response count for the given server port.
+            auto lit = responses_per_listener.find(server_port);
+            if (lit != responses_per_listener.end()) {
+                responses_per_listener[server_port] = lit->second + 1;
+            } else {
+                responses_per_listener[server_port] = 1;
+            }
+        }
+
+        // Make sure that all client threads received responses.
+        ASSERT_EQ(responses_per_thread.size(), effective_threads);
+
+        // Make sure that each client thread received the same number of responses.
+        for (auto const& it : responses_per_thread) {
+            EXPECT_EQ(it.second, (num_batches_ * num_listeners_))
+                      << "thread-id: " << it.first
+                      << ", responses: " << it.second << std::endl;
+        }
+
+        // Make sure that all listeners generated responses.
+        ASSERT_EQ(responses_per_listener.size(), num_listeners_);
+
+        // Make sure Each listener generated the same number of responses.
+        for (auto const& it : responses_per_listener) {
+            EXPECT_EQ(it.second, (num_batches_ * effective_threads))
+                      << "server-port: " << it.first
+                      << ", responses: " << it.second << std::endl;
+        }
+    }
+
+    /// @brief Verifies the client can be paused and resumed repeatedly
+    /// while doing multi-threaded work.
+    ///
+    /// @param num_threads number of threads the HttpClient should use.
+    /// Must be greater than zero, this test does not make sense for a
+    /// single threaded client.
+    /// @param num_batches number of batches of requests that should be
+    /// conducted.
+    /// @param num_listeners number of HttpListeners to create.
+    /// @param num_pauses number of pauses to conduct.
+    void workPauseResumeShutdown(size_t num_threads, size_t num_batches,
+                                 size_t num_listeners, size_t num_pauses) {
+        ASSERT_TRUE(num_threads);
+        ASSERT_TRUE(num_batches);
+        ASSERT_TRUE(num_listeners);
+        num_threads_ = num_threads;
+        num_batches_ = num_batches;
+        num_listeners_ = num_listeners;
+
+        // Calculate the total expected number of requests.
+        size_t total_requests = (num_batches_ * num_listeners_ * num_threads_);
+
+        // Create the listeners.
+        for (auto i = 0; i < num_listeners_; ++i) {
+            // Make a factory
+            HttpResponseCreatorFactoryPtr factory(new TestHttpResponseCreatorFactory(SERVER_PORT + i));
+            factories_.push_back(factory);
+
+            // Need to create a Listener on
+            HttpListenerPtr listener(new HttpListener(io_service_,
+                                                      IOAddress(SERVER_ADDRESS), (SERVER_PORT + i),
+                                                      TlsContextPtr(), factory,
+                                                      HttpListener::RequestTimeout(10000),
+                                                      HttpListener::IdleTimeout(10000)));
+            listeners_.push_back(listener);
+
+            // Start the server.
+            ASSERT_NO_THROW(listener->start());
+        }
+
+        // Create an instant start, MT client with num_threads
+        ASSERT_NO_THROW_LOG(client_.reset(new HttpClient(io_service_, num_threads)));
+        ASSERT_TRUE(client_);
+
+        // Client should be running. Check convenience functions.
+        ASSERT_TRUE(client_->isRunning());
+        ASSERT_FALSE(client_->isPaused());
+        ASSERT_FALSE(client_->isStopped());
+
+        // Verify the pool size and number of threads are as expected.
+        ASSERT_EQ(client_->getThreadPoolSize(), num_threads);
+        ASSERT_EQ(client_->getThreadCount(), num_threads);
+
+        // Start the requisite number of requests:
+        //   batch * listeners * threads.
+        int sequence = 0;
+        for (auto b = 0; b < num_batches; ++b) {
+            for (auto l = 0; l < num_listeners_; ++l) {
+                for (auto t = 0; t < num_threads_; ++t) {
+                    startRequestSimple(++sequence, l);
+                }
+            }
+        }
+
+        size_t rr_count = 0;
+        while (rr_count < total_requests) {
+            size_t request_limit = (pause_cnt_ < num_pauses ?
+                                    (rr_count + ((total_requests - rr_count) / num_pauses))
+                                    : total_requests);
+
+            // Run test IOService until we hit the limit.
+            runIOService(request_limit);
+
+            // If we've done all our pauses we should be through.
+            if (pause_cnt_ == num_pauses) {
+                break;
+            }
+
+            // Pause the client.
+            ASSERT_NO_THROW(client_->pause());
+            ASSERT_TRUE(client_->isPaused());
+            ++pause_cnt_;
+
+            // Check our progress.
+            rr_count = getRRCount();
+            ASSERT_GE(rr_count, request_limit);
+
+            // Resume the client.
+            ASSERT_NO_THROW(client_->resume());
+            ASSERT_TRUE(client_->isRunning());
+        }
+
+        // Client should stop without issue.
+        ASSERT_NO_THROW(client_->stop());
+        ASSERT_TRUE(client_->isStopped());
+
+        // We should have finished all our requests.
+        ASSERT_EQ(getRRCount(), total_requests);
+
+        // Stopping again should be harmless.
+        ASSERT_NO_THROW(client_->stop());
+
+        // Listeners should stop without issue.
+        for (const auto& listener : listeners_) {
+            ASSERT_NO_THROW(listener->stop());
+        }
+
+        // Get the stringified thread-id of the test's main thread.
+        std::stringstream ss;
+        ss << std::this_thread::get_id();
+        std::string main_thread_id = ss.str();
+
+        // Tracks the number for requests fulfilled by main thread.
+        size_t worked_by_main = 0;
+
+        // Iterate over the client request/response pairs.
+        for (auto const& clientRR : clientRRs_) {
+            // Make sure it's whole.
+            ASSERT_FALSE(clientRR->thread_id_.empty());
+            ASSERT_TRUE(clientRR->request_);
+            ASSERT_TRUE(clientRR->response_);
+
+            // Request should contain an integer sequence number.
+            int request_sequence;
+            ConstElementPtr sequence = clientRR->request_->getJsonElement("sequence");
+            ASSERT_TRUE(sequence);
+            ASSERT_NO_THROW(request_sequence = sequence->intValue());
+
+            // Response should contain an integer sequence number.
+            int response_sequence;
+            sequence = clientRR->response_->getJsonElement("sequence");
+            ASSERT_TRUE(sequence);
+            ASSERT_NO_THROW(response_sequence = sequence->intValue());
+
+            // Request and Response sequence numbers should match.
+            ASSERT_EQ(request_sequence, response_sequence);
+
+            ConstElementPtr server_port_elem = clientRR->response_->getJsonElement("server-port");
+            ASSERT_TRUE(server_port_elem);
+
+            // Track how many requests were completed by the main thread.
+            // These can occur when pausing calls IOService::poll.
+            if (clientRR->thread_id_ == main_thread_id) {
+                ++worked_by_main;
+            }
+        }
+
+        // Make sure the majority of the requests were worked by
+        // worker threads.  In theory, the number of calls to poll
+        // times the number of threads is the limit for responses
+        // built by the main thread.
+        ASSERT_LE(worked_by_main, num_pauses * num_threads);
+    }
+
+    /// @brief Fetch the number of completed requests.
+    ///
+    /// @return number of completed requests.
+    size_t getRRCount() {
+        std::lock_guard<std::mutex> lck(test_mutex_);
+        return (clientRRs_.size());
+    }
+
+    /// @brief IO service used in the tests.
+    IOService io_service_;
+
+    /// @brief Instance of the client used in the tests.
+    HttpClientPtr client_;
+
+    /// @brief Instance of the listener used in the tests.
+    HttpListenerPtr listener_;
+
+    /// @brief Pointer to the response creator factory.
+    HttpResponseCreatorFactoryPtr factory_;
+
+    /// @brief List of listeners.
+    std::vector<HttpListenerPtr> listeners_;
+
+    /// @brief List of response factories.
+    std::vector<HttpResponseCreatorFactoryPtr> factories_;
+
+    /// @brief Asynchronous timer service to detect timeouts.
+    IntervalTimer test_timer_;
+
+    /// @brief Number of threads HttpClient should use.
+    size_t num_threads_;
+
+    /// @brief Number of request batches to conduct.
+    size_t num_batches_;
+
+    /// @brief Number of listeners to start.
+    size_t num_listeners_;
+
+    /// @brief Number of expected requests to carry out.
+    size_t expected_requests_;
+
+    /// @brief Number of requests that are in progress.
+    size_t num_in_progress_;
+
+    /// @brief Number of requests that have been completed.
+    size_t num_finished_;
+
+    /// @brief a List of client request-response pairs.
+    std::vector<ClientRRPtr> clientRRs_;
+
+    /// @brief Mutex for locking.
+    std::mutex test_mutex_;
+
+    /// @brief Condition variable used to make client threads wait
+    /// until number of in-progress requests reaches the number
+    /// of client requests.
+    std::condition_variable test_cv_;
+
+    /// @brief Indicates if client threads are currently "paused".
+    bool paused_;
+
+    /// @brief Number of times client has been paused during the test.
+    size_t pause_cnt_;
+};
+
+// Verifies we can construct and destruct, in both single
+// and multi-threaded modes.
+TEST_F(MultiThreadingHttpClientTest, basics) {
+    MultiThreadingMgr::instance().setMode(false);
+    HttpClientPtr client;
+
+    // Value of 0 for thread_pool_size means single-threaded.
+    ASSERT_NO_THROW_LOG(client.reset(new HttpClient(io_service_, 0)));
+    ASSERT_TRUE(client);
+
+    ASSERT_FALSE(client->getThreadIOService());
+    ASSERT_EQ(client->getThreadPoolSize(), 0);
+    ASSERT_EQ(client->getThreadCount(), 0);
+
+    // Make sure destruction doesn't throw.
+    ASSERT_NO_THROW_LOG(client.reset());
+
+    // Non-zero thread-pool-size means multi-threaded mode, should throw.
+    ASSERT_THROW_MSG(client.reset(new HttpClient(io_service_, 1)), InvalidOperation,
+                                  "HttpClient thread_pool_size must be zero"
+                                  "when Kea core multi-threading is disabled");
+    ASSERT_FALSE(client);
+
+    // Enable Kea core multi-threading.
+    MultiThreadingMgr::instance().setMode(true);
+
+    // Multi-threaded construction should work now.
+    ASSERT_NO_THROW_LOG(client.reset(new HttpClient(io_service_, 3)));
+    ASSERT_TRUE(client);
+
+    // Verify that it has an internal IOService and that thread pool size
+    // and thread count match.
+    ASSERT_TRUE(client->getThreadIOService());
+    EXPECT_FALSE(client->getThreadIOService()->stopped());
+    ASSERT_EQ(client->getThreadPoolSize(), 3);
+    ASSERT_EQ(client->getThreadCount(), 3);
+
+    // Check convenience functions.
+    ASSERT_TRUE(client->isRunning());
+    ASSERT_FALSE(client->isPaused());
+    ASSERT_FALSE(client->isStopped());
+
+    // Verify stop doesn't throw.
+    ASSERT_NO_THROW_LOG(client->stop());
+
+    // Verify we're stopped.
+    ASSERT_TRUE(client->getThreadIOService());
+    EXPECT_TRUE(client->getThreadIOService()->stopped());
+    ASSERT_EQ(client->getThreadPoolSize(), 3);
+    ASSERT_EQ(client->getThreadCount(), 0);
+
+    // Check convenience functions.
+    ASSERT_FALSE(client->isRunning());
+    ASSERT_FALSE(client->isPaused());
+    ASSERT_TRUE(client->isStopped());
+
+    // Verify a second call to stop() doesn't throw.
+    ASSERT_NO_THROW_LOG(client->stop());
+
+    // Make sure destruction doesn't throw.
+    ASSERT_NO_THROW_LOG(client.reset());
+
+    // Create another multi-threaded instance.
+    ASSERT_NO_THROW_LOG(client.reset(new HttpClient(io_service_, 3)));
+
+    // Make sure destruction doesn't throw.
+    ASSERT_NO_THROW_LOG(client.reset());
+}
+
+// Verifies we can construct with deferred start.
+TEST_F(MultiThreadingHttpClientTest, deferredStart) {
+    MultiThreadingMgr::instance().setMode(true);
+    HttpClientPtr client;
+    size_t thread_pool_size = 3;
+
+    // Create MT client with deferred start.
+    ASSERT_NO_THROW_LOG(client.reset(new HttpClient(io_service_, thread_pool_size, true)));
+    ASSERT_TRUE(client);
+
+    // Client should be STOPPED, with no threads.
+    ASSERT_TRUE(client->getThreadIOService());
+    ASSERT_EQ(client->getThreadPoolSize(), thread_pool_size);
+    ASSERT_EQ(client->getThreadCount(), 0);
+
+    // Check convenience functions.
+    ASSERT_FALSE(client->isRunning());
+    ASSERT_FALSE(client->isPaused());
+    ASSERT_TRUE(client->isStopped());
+
+    // We should be able to start it.
+    ASSERT_NO_THROW(client->start());
+
+    // Verify we have threads and run state is RUNNING.
+    ASSERT_EQ(client->getThreadCount(), 3);
+    ASSERT_TRUE(client->getThreadIOService());
+    ASSERT_FALSE(client->getThreadIOService()->stopped());
+
+    // Check convenience functions.
+    ASSERT_TRUE(client->isRunning());
+    ASSERT_FALSE(client->isPaused());
+    ASSERT_FALSE(client->isStopped());
+
+    // Second call to start should be harmless.
+    ASSERT_NO_THROW_LOG(client->start());
+
+    // Verify we didn't break it.
+    ASSERT_EQ(client->getThreadCount(), 3);
+    ASSERT_TRUE(client->isRunning());
+
+    // Make sure destruction doesn't throw.
+    ASSERT_NO_THROW_LOG(client.reset());
+}
+
+// Verifies we can restart after stop.
+TEST_F(MultiThreadingHttpClientTest, restartAfterStop) {
+    MultiThreadingMgr::instance().setMode(true);
+    HttpClientPtr client;
+    size_t thread_pool_size = 3;
+
+    // Create MT client with instant start.
+    ASSERT_NO_THROW_LOG(client.reset(new HttpClient(io_service_, thread_pool_size)));
+    ASSERT_TRUE(client);
+
+    // Verify we're started.
+    ASSERT_EQ(client->getThreadCount(), 3);
+    ASSERT_TRUE(client->getThreadIOService());
+    ASSERT_FALSE(client->getThreadIOService()->stopped());
+    ASSERT_TRUE(client->isRunning());
+
+    // Stop should succeed.
+    ASSERT_NO_THROW_LOG(client->stop());
+
+    // Verify we're stopped.
+    ASSERT_EQ(client->getThreadCount(), 0);
+    ASSERT_TRUE(client->getThreadIOService());
+    ASSERT_TRUE(client->getThreadIOService()->stopped());
+    ASSERT_TRUE(client->isStopped());
+
+    // Starting again should succeed.
+    ASSERT_NO_THROW_LOG(client->start());
+
+    // Verify we didn't break it.
+    ASSERT_EQ(client->getThreadCount(), 3);
+    ASSERT_TRUE(client->getThreadIOService());
+    ASSERT_FALSE(client->getThreadIOService()->stopped());
+    ASSERT_TRUE(client->isRunning());
+
+    // Make sure destruction doesn't throw.
+    ASSERT_NO_THROW_LOG(client.reset());
+}
+
+// Now we'll run some permutations of the number of client threads,
+// requests, and listeners.
+
+// Single-threaded, three batches, one listener.
+TEST_F(MultiThreadingHttpClientTest, zeroByThreeByOne) {
+    size_t num_threads = 0; // Zero threads = ST mode.
+    size_t num_batches = 3;
+    threadRequestAndReceive(num_threads, num_batches);
+}
+
+// Single-threaded, three batches, three listeners.
+TEST_F(MultiThreadingHttpClientTest, zeroByThreeByThree) {
+    size_t num_threads = 0; // Zero threads = ST mode.
+    size_t num_batches = 3;
+    size_t num_listeners = 3;
+    threadRequestAndReceive(num_threads, num_batches, num_listeners);
+}
+
+// Multi-threaded with one thread, three batches, one listener
+TEST_F(MultiThreadingHttpClientTest, oneByThreeByOne) {
+    size_t num_threads = 1;
+    size_t num_batches = 3;
+    threadRequestAndReceive(num_threads, num_batches);
+}
+
+// Multi-threaded with three threads, three batches, one listener
+TEST_F(MultiThreadingHttpClientTest, threeByThreeByOne) {
+    size_t num_threads = 3;
+    size_t num_batches = 3;
+    threadRequestAndReceive(num_threads, num_batches);
+}
+
+// Multi-threaded with three threads, nine batches, one listener
+TEST_F(MultiThreadingHttpClientTest, threeByNineByOne) {
+    size_t num_threads = 3;
+    size_t num_batches = 9;
+    threadRequestAndReceive(num_threads, num_batches);
+}
+
+// Multi-threaded with two threads, four batches, two listeners
+TEST_F(MultiThreadingHttpClientTest, twoByFourByTwo) {
+    size_t num_threads = 2;
+    size_t num_batches = 4;
+    size_t num_listeners = 2;
+    threadRequestAndReceive(num_threads, num_batches, num_listeners);
+}
+
+// Multi-threaded with four threads, four batches, two listeners
+TEST_F(MultiThreadingHttpClientTest, fourByFourByTwo) {
+    size_t num_threads = 4;
+    size_t num_batches = 4;
+    size_t num_listeners = 2;
+    threadRequestAndReceive(num_threads, num_batches, num_listeners);
+}
+
+// Verifies that we can cleanly pause, resume, and shutdown while doing
+// multi-threaded work.
+TEST_F(MultiThreadingHttpClientTest, workPauseResumeShutdown) {
+    size_t num_threads = 4;
+    size_t num_batches = 4;
+    size_t num_listeners = 4;
+    size_t num_pauses = 3;
+    workPauseResumeShutdown(num_threads, num_batches, num_listeners, num_pauses);
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/http/tests/connection_pool_unittests.cc b/src/lib/http/tests/connection_pool_unittests.cc
new file mode 100644
index 0000000..b8337c3
--- /dev/null
+++ b/src/lib/http/tests/connection_pool_unittests.cc
@@ -0,0 +1,270 @@
+// Copyright (C) 2017-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_service.h>
+#include <http/http_acceptor.h>
+#include <http/connection.h>
+#include <http/connection_pool.h>
+#include <http/post_request_json.h>
+#include <http/response_creator.h>
+#include <http/response_json.h>
+#include <http/tests/response_test.h>
+#include <util/multi_threading_mgr.h>
+
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <algorithm>
+
+using namespace isc::asiolink;
+using namespace isc::http;
+using namespace isc::http::test;
+using namespace isc::util;
+
+namespace {
+
+/// @brief Test HTTP response.
+typedef TestHttpResponseBase<HttpResponseJson> Response;
+
+/// @brief Pointer to test HTTP response.
+typedef boost::shared_ptr<Response> ResponsePtr;
+
+/// @brief Request timeout used in tests.
+const long CONN_REQUEST_TIMEOUT = 1000;
+
+/// @brief Idle connection timeout used in tests.
+const long CONN_IDLE_TIMEOUT = 1000;
+
+/// @brief Implementation of the @ref HttpResponseCreator.
+class TestHttpResponseCreator : public HttpResponseCreator {
+public:
+
+    /// @brief Create a new request.
+    ///
+    /// @return Pointer to the new instance of the @ref HttpRequest.
+    virtual HttpRequestPtr
+    createNewHttpRequest() const {
+        return (HttpRequestPtr(new PostHttpRequestJson()));
+    }
+
+private:
+
+    /// @brief Creates HTTP response.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP response.
+    virtual HttpResponsePtr
+    createStockHttpResponse(const HttpRequestPtr& request,
+                            const HttpStatusCode& status_code) const {
+        // The request hasn't been finalized so the request object
+        // doesn't contain any information about the HTTP version number
+        // used. But, the context should have this data (assuming the
+        // HTTP version is parsed ok).
+        HttpVersion http_version(request->context()->http_version_major_,
+                                 request->context()->http_version_minor_);
+        // This will generate the response holding JSON content.
+        ResponsePtr response(new Response(http_version, status_code));
+        return (response);
+    }
+
+    /// @brief Creates HTTP response.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP OK response with no content.
+    virtual HttpResponsePtr
+    createDynamicHttpResponse(HttpRequestPtr request) {
+        // The simplest thing is to create a response with no content.
+        // We don't need content to test our class.
+        ResponsePtr response(new Response(request->getHttpVersion(),
+                                          HttpStatusCode::OK));
+        return (response);
+    }
+};
+
+/// @brief Derivation of @ref HttpConnectionPool exposing protected member.
+class TestHttpConnectionPool : public HttpConnectionPool {
+public:
+
+    using HttpConnectionPool::connections_;
+
+    /// @brief Checks if specified connection belongs to the pool.
+    bool hasConnection(const HttpConnectionPtr& conn) const {
+        return (std::find(connections_.begin(), connections_.end(), conn)
+                != connections_.end());
+    }
+
+};
+
+/// @brief Test fixture class for @ref HttpConnectionPool.
+class HttpConnectionPoolTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    HttpConnectionPoolTest()
+        : io_service_(),
+          acceptor_(new HttpAcceptor(io_service_)),
+          connection_pool_(),
+          response_creator_(new TestHttpResponseCreator()) {
+        MultiThreadingMgr::instance().setMode(false);
+    }
+
+    /// @brief Destructor.
+    ~HttpConnectionPoolTest() {
+        MultiThreadingMgr::instance().setMode(false);
+    }
+
+    /// @brief Verifies that connections can be added to the pool and removed.
+    void startStopTest() {
+        // Create two distinct connections.
+        HttpConnectionPtr conn1(new HttpConnection(io_service_, acceptor_,
+                                                   TlsContextPtr(),
+                                                   connection_pool_,
+                                                   response_creator_,
+                                                   HttpAcceptorCallback(),
+                                                   CONN_REQUEST_TIMEOUT,
+                                                   CONN_IDLE_TIMEOUT));
+
+        HttpConnectionPtr conn2(new HttpConnection(io_service_, acceptor_,
+                                                   TlsContextPtr(),
+                                                   connection_pool_,
+                                                   response_creator_,
+                                                   HttpAcceptorCallback(),
+                                                   CONN_REQUEST_TIMEOUT,
+                                                   CONN_IDLE_TIMEOUT));
+        // The pool should be initially empty.
+        TestHttpConnectionPool pool;
+        ASSERT_TRUE(pool.connections_.empty());
+
+        // Start first connection and check that it has been added to the pool.
+        ASSERT_NO_THROW(pool.start(conn1));
+        ASSERT_EQ(1, pool.connections_.size());
+        ASSERT_EQ(1, pool.hasConnection(conn1));
+
+        // Start second connection and check that it also has been added.
+        ASSERT_NO_THROW(pool.start(conn2));
+        ASSERT_EQ(2, pool.connections_.size());
+        ASSERT_EQ(1, pool.hasConnection(conn2));
+
+        // Stop first connection.
+        ASSERT_NO_THROW(pool.stop(conn1));
+        ASSERT_EQ(1, pool.connections_.size());
+        // Check that it has been removed but the second connection is still
+        // there.
+        ASSERT_EQ(0, pool.hasConnection(conn1));
+        ASSERT_EQ(1, pool.hasConnection(conn2));
+
+        // Remove second connection and verify.
+        ASSERT_NO_THROW(pool.stop(conn2));
+        EXPECT_TRUE(pool.connections_.empty());
+    }
+
+    /// @brief Verifies that all connections can be remove with a single call.
+    void stopAllTest() {
+        // Create two distinct connections.
+        HttpConnectionPtr conn1(new HttpConnection(io_service_, acceptor_,
+                                                   TlsContextPtr(),
+                                                   connection_pool_,
+                                                   response_creator_,
+                                                   HttpAcceptorCallback(),
+                                                   CONN_REQUEST_TIMEOUT,
+                                                   CONN_IDLE_TIMEOUT));
+
+        HttpConnectionPtr conn2(new HttpConnection(io_service_, acceptor_,
+                                                   TlsContextPtr(),
+                                                   connection_pool_,
+                                                   response_creator_,
+                                                   HttpAcceptorCallback(),
+                                                   CONN_REQUEST_TIMEOUT,
+                                                   CONN_IDLE_TIMEOUT));
+        TestHttpConnectionPool pool;
+        ASSERT_NO_THROW(pool.start(conn1));
+        ASSERT_NO_THROW(pool.start(conn2));
+
+        // There are two distinct connections in the pool.
+        ASSERT_EQ(2, pool.connections_.size());
+
+        // This should remove all connections.
+        ASSERT_NO_THROW(pool.stopAll());
+        EXPECT_TRUE(pool.connections_.empty());
+    }
+
+    /// @brief Verifies that stopping a non-existing connection is no-op.
+    void stopInvalidTest() {
+        HttpConnectionPtr conn1(new HttpConnection(io_service_, acceptor_,
+                                                   TlsContextPtr(),
+                                                   connection_pool_,
+                                                   response_creator_,
+                                                   HttpAcceptorCallback(),
+                                                   CONN_REQUEST_TIMEOUT,
+                                                   CONN_IDLE_TIMEOUT));
+
+        HttpConnectionPtr conn2(new HttpConnection(io_service_, acceptor_,
+                                                   TlsContextPtr(),
+                                                   connection_pool_,
+                                                   response_creator_,
+                                                   HttpAcceptorCallback(),
+                                                   CONN_REQUEST_TIMEOUT,
+                                                   CONN_IDLE_TIMEOUT));
+        TestHttpConnectionPool pool;
+        ASSERT_NO_THROW(pool.start(conn1));
+        ASSERT_NO_THROW(pool.stop(conn2));
+        ASSERT_EQ(1, pool.connections_.size());
+        ASSERT_EQ(1, pool.hasConnection(conn1));
+    }
+
+    IOService io_service_;                      ///< IO service.
+    HttpAcceptorPtr acceptor_;                  ///< Test acceptor.
+    HttpConnectionPool connection_pool_;        ///< Test connection pool.
+    HttpResponseCreatorPtr response_creator_;   ///< Test response creator.
+
+};
+
+// Verifies that connections can be added to the pool and removed.
+// with MultiThreading disabled.
+TEST_F(HttpConnectionPoolTest, startStopTest) {
+    ASSERT_FALSE(MultiThreadingMgr::instance().getMode());
+    startStopTest();
+}
+
+// Verifies that connections can be added to the pool and removed
+// with MultiThreading enabled.
+TEST_F(HttpConnectionPoolTest, startStopTestMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    startStopTest();
+}
+
+// Check that all connections can be remove with a single call.
+// with MultiThreading disabled.
+TEST_F(HttpConnectionPoolTest, stopAll) {
+    ASSERT_FALSE(MultiThreadingMgr::instance().getMode());
+    stopAllTest();
+}
+
+// Check that all connections can be remove with a single call
+// with MultiThreading enabled.
+TEST_F(HttpConnectionPoolTest, stopAllMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_TRUE(MultiThreadingMgr::instance().getMode());
+    stopAllTest();
+}
+
+// Check that stopping non-existing connection is no-op.
+// with MultiThreading disabled.
+TEST_F(HttpConnectionPoolTest, stopInvalid) {
+    ASSERT_FALSE(MultiThreadingMgr::instance().getMode());
+    stopInvalidTest();
+}
+
+// Check that stopping non-existing connection is no-op.
+// with MultiThreading enabled.
+TEST_F(HttpConnectionPoolTest, stopInvalidMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_TRUE(MultiThreadingMgr::instance().getMode());
+    stopInvalidTest();
+}
+
+}
diff --git a/src/lib/http/tests/date_time_unittests.cc b/src/lib/http/tests/date_time_unittests.cc
new file mode 100644
index 0000000..59d75b1
--- /dev/null
+++ b/src/lib/http/tests/date_time_unittests.cc
@@ -0,0 +1,190 @@
+// Copyright (C) 2016-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <http/date_time.h>
+#include <boost/date_time/gregorian/gregorian.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <gtest/gtest.h>
+
+using namespace boost::gregorian;
+using namespace boost::posix_time;
+using namespace isc::http;
+
+namespace {
+
+/// @brief Test fixture class for @ref HttpDateTime.
+class HttpDateTimeTest : public ::testing::Test {
+public:
+
+    /// @brief Checks time value against expected values.
+    ///
+    /// This method uses value of @ref date_time_ for the test.
+    ///
+    /// @param exp_day_of_week Expected day of week.
+    /// @param exp_day Expected day of month.
+    /// @param exp_month Expected month.
+    /// @param exp_year Expected year.
+    /// @param exp_hours Expected hour value.
+    /// @param exp_minutes Expected minutes value.
+    /// @param exp_seconds Expected seconds value.
+    void testDateTime(const unsigned short exp_day_of_week,
+                      const unsigned short exp_day,
+                      const unsigned short exp_month,
+                      const unsigned short exp_year,
+                      const long exp_hours,
+                      const long exp_minutes,
+                      const long exp_seconds) {
+        // Retrieve @c boost::posix_time::ptime value.
+        ptime as_ptime = date_time_.getPtime();
+        // Date is contained within this object.
+        date date_part = as_ptime.date();
+
+        // Verify weekday.
+        greg_weekday day_of_week = date_part.day_of_week();
+        EXPECT_EQ(exp_day_of_week, day_of_week.as_number());
+
+        // Verify day of month.
+        greg_day day = date_part.day();
+        EXPECT_EQ(exp_day, day.as_number());
+
+        // Verify month.
+        greg_month month = date_part.month();
+        EXPECT_EQ(exp_month, month.as_number());
+
+        // Verify year.
+        greg_year year = date_part.year();
+        EXPECT_EQ(exp_year, static_cast<unsigned short>(year));
+
+        // Retrieve time of the day and verify hour, minute and second.
+        time_duration time_of_day = as_ptime.time_of_day();
+        EXPECT_EQ(exp_hours, time_of_day.hours());
+        EXPECT_EQ(exp_minutes, time_of_day.minutes());
+        EXPECT_EQ(exp_seconds, time_of_day.seconds());
+    }
+
+    /// @brief Date/time value which should be set by the tests.
+    HttpDateTime date_time_;
+
+};
+
+// Test formatting as specified in RFC 1123.
+TEST_F(HttpDateTimeTest, rfc1123Format) {
+    date gdate(greg_year(2002), greg_month(1), greg_day(20));
+    time_duration tm(23, 59, 59, 0);
+    ptime t = ptime(gdate, tm);
+    HttpDateTime date_time(t);
+    std::string formatted;
+    ASSERT_NO_THROW(formatted = date_time.rfc1123Format());
+    EXPECT_EQ("Sun, 20 Jan 2002 23:59:59 GMT", formatted);
+}
+
+// Test formatting as specified in RFC 850.
+TEST_F(HttpDateTimeTest, rfc850Format) {
+    date gdate(greg_year(1994), greg_month(8), greg_day(6));
+    time_duration tm(11, 12, 13, 0);
+    ptime t = ptime(gdate, tm);
+
+    HttpDateTime date_time(t);
+    std::string formatted;
+    ASSERT_NO_THROW(formatted = date_time.rfc850Format());
+    EXPECT_EQ("Saturday, 06-Aug-94 11:12:13 GMT", formatted);
+}
+
+// Test formatting as output of asctime().
+TEST_F(HttpDateTimeTest, asctimeFormat) {
+    date gdate(greg_year(1999), greg_month(11), greg_day(2));
+    time_duration tm(03, 57, 12, 0);
+    ptime t = ptime(gdate, tm);
+
+    HttpDateTime date_time(t);
+    std::string formatted;
+    ASSERT_NO_THROW(formatted = date_time.asctimeFormat());
+    EXPECT_EQ("Tue Nov  2 03:57:12 1999", formatted);
+}
+
+// Test parsing time in RFC 1123 format.
+TEST_F(HttpDateTimeTest, fromRfc1123) {
+    ASSERT_NO_THROW(
+        date_time_ = HttpDateTime::fromRfc1123("Wed, 21 Dec 2016 18:53:45 GMT")
+    );
+    testDateTime(3, 21, 12, 2016, 18, 53, 45);
+    EXPECT_THROW(HttpDateTime::fromRfc1123("Wed, 21 Dex 2016 18:53:45 GMT"),
+                 HttpTimeConversionError);
+    EXPECT_THROW(HttpDateTime::fromRfc1123("Wed, 43 Dec 2016 18:53:45 GMT"),
+                 HttpTimeConversionError);
+    EXPECT_THROW(HttpDateTime::fromRfc1123("Wed, 21 Dec 16 18:53:45 GMT"),
+                 HttpTimeConversionError);
+    EXPECT_THROW(HttpDateTime::fromRfc1123("Wed, 21 Dec 2016 18:53:45"),
+                 HttpTimeConversionError);
+    EXPECT_THROW(HttpDateTime::fromRfc1123("Wed, 21 Dec 2016 1853:45 GMT"),
+                 HttpTimeConversionError);
+}
+
+// Test parsing time in RFC 850 format.
+TEST_F(HttpDateTimeTest, fromRfc850) {
+    ASSERT_NO_THROW(
+        date_time_ = HttpDateTime::fromRfc850("Wednesday, 21-Dec-16 18:53:45 GMT");
+    );
+    testDateTime(3, 21, 12, 2016, 18, 53, 45);
+    EXPECT_THROW(HttpDateTime::fromRfc850("Wednesday, 55-Dec-16 18:53:45 GMT"),
+                 HttpTimeConversionError);
+    EXPECT_THROW(HttpDateTime::fromRfc850("Wednesday, 21-Dex-16 18:53:45 GMT"),
+                 HttpTimeConversionError);
+    EXPECT_THROW(HttpDateTime::fromRfc850("Wednesday, 21-Dec-2016 18:53:45 GMT"),
+                 HttpTimeConversionError);
+    EXPECT_THROW(HttpDateTime::fromRfc850("Wednesday, 21-Dec-16 1853:45 GMT"),
+                 HttpTimeConversionError);
+}
+
+// Test parsing time in asctime() format.
+TEST_F(HttpDateTimeTest, fromRfcAsctime) {
+    ASSERT_NO_THROW(
+        date_time_ = HttpDateTime::fromAsctime("Wed Dec 21 08:49:37 2016");
+    );
+    testDateTime(3, 21, 12, 2016, 8, 49, 37);
+    EXPECT_THROW(HttpDateTime::fromAsctime("Wed Dex 21 08:49:37 2016"),
+                 HttpTimeConversionError);
+    EXPECT_THROW(HttpDateTime::fromAsctime("Wed Dec 55 08:49:37 2016"),
+                 HttpTimeConversionError);
+    EXPECT_THROW(HttpDateTime::fromAsctime("Wed Dec 21 08:49:37 16"),
+                 HttpTimeConversionError);
+    EXPECT_THROW(HttpDateTime::fromAsctime("Wed Dec 21 08:4937 2016"),
+                 HttpTimeConversionError);
+}
+
+// Test parsing time in RFC 1123 format using HttpDateTime::fromAny().
+TEST_F(HttpDateTimeTest, fromAnyRfc1123) {
+    ASSERT_NO_THROW(
+        date_time_ = HttpDateTime::fromAny("Thu, 05 Jan 2017 09:15:06 GMT");
+    );
+    testDateTime(4, 5, 1, 2017, 9, 15, 06);
+}
+
+// Test parsing time in RFC 850 format using HttpDateTime::fromAny().
+TEST_F(HttpDateTimeTest, fromAnyRfc850) {
+    ASSERT_NO_THROW(
+        date_time_ = HttpDateTime::fromAny("Saturday, 18-Feb-17 01:02:10 GMT");
+    );
+    testDateTime(6, 18, 2, 2017, 1, 2, 10);
+}
+
+// Test parsing time in asctime() format using HttpDateTime::fromAny().
+TEST_F(HttpDateTimeTest, fromAnyAsctime) {
+    ASSERT_NO_THROW(
+        date_time_ = HttpDateTime::fromAny("Wed Mar  1 15:45:07 2017 GMT");
+    );
+    testDateTime(3, 1, 3, 2017, 15, 45, 7);
+}
+
+// Test that HttpDateTime::fromAny throws exception if unsupported format is
+// used.
+TEST_F(HttpDateTimeTest, fromAnyInvalidFormat) {
+    EXPECT_THROW(HttpDateTime::fromAsctime("20020131T235959"),
+                 HttpTimeConversionError);
+}
+
+}
diff --git a/src/lib/http/tests/http_header_unittests.cc b/src/lib/http/tests/http_header_unittests.cc
new file mode 100644
index 0000000..df9d5bb
--- /dev/null
+++ b/src/lib/http/tests/http_header_unittests.cc
@@ -0,0 +1,54 @@
+// Copyright (C) 2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <exceptions/exceptions.h>
+#include <http/http_header.h>
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::http;
+
+namespace {
+
+// Test that HTTP header can be created.
+TEST(HttpHeader, create) {
+    HttpHeader hdr("Content-Type", "application/json");
+    EXPECT_EQ("Content-Type", hdr.getName());
+    EXPECT_EQ("application/json", hdr.getValue());
+}
+
+// Test that the numeric value can be retrieved from a header and that
+// an exception is thrown if the header value is not a valid number.
+TEST(HttpHeader, getUint64Value) {
+    HttpHeader hdr64("Content-Length", "64");
+    EXPECT_EQ(64, hdr64.getUint64Value());
+
+    HttpHeader hdr_foo("Content-Length", "foo");
+    EXPECT_THROW(hdr_foo.getUint64Value(), isc::BadValue);
+}
+
+// Test that header name can be retrieved in lower case.
+TEST(HttpHeader, getLowerCaseName) {
+    HttpHeader hdr("ConnectioN", "Keep-Alive");
+    EXPECT_EQ("connection", hdr.getLowerCaseName());
+}
+
+// Test that header value can be retrieved in lower case.
+TEST(HttpHeader, getLowerCaseValue) {
+    HttpHeader hdr("Connection", "Keep-Alive");
+    EXPECT_EQ("keep-alive", hdr.getLowerCaseValue());
+}
+
+// Test that header value comparison is case insensitive.
+TEST(HttpHeader, equalsCaseInsensitive) {
+    HttpHeader hdr("Connection", "KeEp-ALIve");
+    EXPECT_TRUE(hdr.isValueEqual("keep-alive"));
+    EXPECT_TRUE(hdr.isValueEqual("KEEP-ALIVE"));
+    EXPECT_TRUE(hdr.isValueEqual("kEeP-AlIvE"));
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/http/tests/http_thread_pool_unittests.cc b/src/lib/http/tests/http_thread_pool_unittests.cc
new file mode 100644
index 0000000..aa08ada
--- /dev/null
+++ b/src/lib/http/tests/http_thread_pool_unittests.cc
@@ -0,0 +1,265 @@
+// Copyright (C) 2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/interval_timer.h>
+#include <asiolink/io_service.h>
+#include <exceptions/exceptions.h>
+#include <http/http_thread_pool.h>
+#include <testutils/gtest_utils.h>
+
+#include <gtest/gtest.h>
+#include <string>
+
+using namespace isc;
+using namespace isc::asiolink;
+using namespace isc::http;
+
+namespace {
+
+/// @brief Test timeout (ms).
+const long TEST_TIMEOUT = 10000;
+
+/// @brief Simple test fixture for testing HttpThreadPool.
+class HttpThreadPoolTest : public ::testing::Test {
+public:
+    /// @brief Constructor.
+    HttpThreadPoolTest()
+        : io_service_(new IOService()) {
+    }
+
+    /// @brief Destructor.
+    virtual ~HttpThreadPoolTest() {
+        io_service_->stop();
+    }
+
+    /// @brief IOService instance used by thread pools.
+    IOServicePtr io_service_;
+};
+
+// URL contains scheme and hostname.
+TEST_F(HttpThreadPoolTest, invalidConstruction) {
+    HttpThreadPoolPtr pool;
+
+    // Constructing with pool size of 0 should fail.
+    ASSERT_THROW_MSG(pool.reset(new HttpThreadPool(io_service_, 0)), BadValue,
+                     "pool_size must be non 0");
+}
+
+// Verifies that a pool can be created without starting it.
+TEST_F(HttpThreadPoolTest, deferredStartConstruction) {
+    HttpThreadPoolPtr pool;
+
+    ASSERT_NO_THROW_LOG(pool.reset(new HttpThreadPool(io_service_, 3, true)));
+
+    // State should be stopped.
+    // Pool size should be 3.
+    // IOService should be there.
+    // IOService is new, so it should not be stopped.
+    // No threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_EQ(pool->getPoolSize(), 3);
+    ASSERT_TRUE(pool->getIOService());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Destructor should not throw.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that a pool can be started within the constructor.
+TEST_F(HttpThreadPoolTest, startDuringConstruction) {
+    HttpThreadPoolPtr pool;
+
+    ASSERT_NO_THROW_LOG(pool.reset(new HttpThreadPool(io_service_, 3)));
+
+    // State should be running.
+    // Pool size should be 3.
+    // IOService should be there.
+    // IOService is new, so it should not be stopped.
+    // Should have 3 threads in the pool.
+    ASSERT_TRUE(pool->isRunning());
+    EXPECT_EQ(pool->getPoolSize(), 3);
+    ASSERT_TRUE(pool->getIOService());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Destructor should not throw.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that pool can move from STOPPED to RUNNING.
+TEST_F(HttpThreadPoolTest, stoppedToRunning) {
+    HttpThreadPoolPtr pool;
+
+    // Create a stopped pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new HttpThreadPool(io_service_, 3, true)));
+    ASSERT_TRUE(pool->isStopped());
+
+    // Call run from STOPPED.
+    ASSERT_NO_THROW_LOG(pool->run());
+
+    // State should be RUNNING, IOService should not be stopped, we should
+    // have 3 threads in the pool.
+    ASSERT_TRUE(pool->isRunning());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Calling run again should be harmless.
+    ASSERT_NO_THROW_LOG(pool->run());
+
+    // State should be RUNNING, IOService should not be stopped, we should
+    // have 3 threads in the pool.
+    ASSERT_TRUE(pool->isRunning());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that pool can move from RUNNING to STOPPED.
+TEST_F(HttpThreadPoolTest, runningToStopped) {
+    HttpThreadPoolPtr pool;
+
+    // Create a running pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new HttpThreadPool(io_service_, 3, false)));
+    ASSERT_TRUE(pool->isRunning());
+
+    // Call stop.
+    ASSERT_NO_THROW_LOG(pool->stop());
+
+    // State should be STOPPED, IOService should be stopped, we should
+    // have 0 threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_TRUE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Calling stop again should be harmless.
+    ASSERT_NO_THROW_LOG(pool->stop());
+
+    // State should be STOPPED, IOService should be stopped, we should
+    // have 0 threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_TRUE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that pool can move from RUNNING to PAUSED.
+TEST_F(HttpThreadPoolTest, runningToPaused) {
+    HttpThreadPoolPtr pool;
+
+    // Create a running pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new HttpThreadPool(io_service_, 3, false)));
+    ASSERT_TRUE(pool->isRunning());
+
+    // Call pause from RUNNING.
+    ASSERT_NO_THROW_LOG(pool->pause());
+
+    // State should be PAUSED, IOService should be stopped, we should
+    // have 3 threads in the pool.
+    ASSERT_TRUE(pool->isPaused());
+    EXPECT_TRUE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Calling pause again should be harmless.
+    ASSERT_NO_THROW_LOG(pool->pause());
+
+    // State should be PAUSED, IOService should be stopped, we should
+    // have 3 threads in the pool.
+    ASSERT_TRUE(pool->isPaused());
+    EXPECT_TRUE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that pool can move from PAUSED to RUNNING.
+TEST_F(HttpThreadPoolTest, pausedToRunning) {
+    HttpThreadPoolPtr pool;
+
+    // Create a running pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new HttpThreadPool(io_service_, 3, false)));
+    ASSERT_TRUE(pool->isRunning());
+
+    // Call pause from RUNNING.
+    ASSERT_NO_THROW_LOG(pool->pause());
+    ASSERT_TRUE(pool->isPaused());
+
+    // Call run.
+    ASSERT_NO_THROW_LOG(pool->run());
+
+    // State should be RUNNING, IOService should not be stopped, we should
+    // have 3 threads in the pool.
+    ASSERT_TRUE(pool->isRunning());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that pool can move from PAUSED to STOPPED.
+TEST_F(HttpThreadPoolTest, pausedToStopped) {
+    HttpThreadPoolPtr pool;
+
+    // Create a running pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new HttpThreadPool(io_service_, 3, false)));
+    ASSERT_TRUE(pool->isRunning());
+
+    // Call pause from RUNNING.
+    ASSERT_NO_THROW_LOG(pool->pause());
+    ASSERT_TRUE(pool->isPaused());
+
+    // Call stop.
+    ASSERT_NO_THROW_LOG(pool->stop());
+
+    // State should be STOPPED, IOService should be stopped, we should
+    // have 0 threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_TRUE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that attempting to pause a STOPPED pool has no effect.
+TEST_F(HttpThreadPoolTest, stoppedToPaused) {
+    HttpThreadPoolPtr pool;
+
+    // Create a stopped pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new HttpThreadPool(io_service_, 3, true)));
+    ASSERT_TRUE(pool->isStopped());
+
+    // State should be STOPPED, IOService won't be stopped because it was
+    // never started. We should have 0 threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Call pause from STOPPED.
+    ASSERT_NO_THROW_LOG(pool->pause());
+
+    // Should have no effect.
+    ASSERT_TRUE(pool->isStopped());
+
+    // State should be STOPPED, IOService won't be stopped because it was
+    // never started. We should have 0 threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+}
diff --git a/src/lib/http/tests/post_request_json_unittests.cc b/src/lib/http/tests/post_request_json_unittests.cc
new file mode 100644
index 0000000..bb717cd
--- /dev/null
+++ b/src/lib/http/tests/post_request_json_unittests.cc
@@ -0,0 +1,197 @@
+// Copyright (C) 2016-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cc/data.h>
+#include <http/http_types.h>
+#include <http/post_request_json.h>
+#include <http/tests/request_test.h>
+#include <gtest/gtest.h>
+#include <map>
+#include <sstream>
+
+using namespace isc::data;
+using namespace isc::http;
+using namespace isc::http::test;
+
+namespace {
+
+/// @brief Test fixture class for @ref PostHttpRequestJson.
+class PostHttpRequestJsonTest :
+        public HttpRequestTestBase<PostHttpRequestJson> {
+public:
+
+    /// @brief Constructor.
+    PostHttpRequestJsonTest()
+        : HttpRequestTestBase<PostHttpRequestJson>(),
+        json_body_("{ \"service\": \"dhcp4\", \"param1\": \"foo\" }") {
+    }
+
+    /// @brief Sets new JSON body for the HTTP request context.
+    ///
+    /// If the body parameter is empty, it will use the value of
+    /// @ref json_body_ member. Otherwise, it will assign the body
+    /// provided as parameter.
+    ///
+    /// @param body new body value.
+    void setBody(const std::string& body = "") {
+        request_->context()->body_ = body.empty() ? json_body_ : body;
+    }
+
+    /// @brief Default value of the JSON body.
+    std::string json_body_;
+};
+
+// This test verifies that PostHttpRequestJson class only accepts
+// POST messages.
+TEST_F(PostHttpRequestJsonTest, requiredPost) {
+    // Use a GET method that is not supported.
+    setContextBasics("GET", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+
+    ASSERT_THROW(request_->create(), HttpRequestError);
+
+    // Now use POST. It should be accepted.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+
+    EXPECT_NO_THROW(request_->create());
+}
+
+// This test verifies that PostHttpRequest requires "Content-Length"
+// header equal to "application/json".
+TEST_F(PostHttpRequestJsonTest, requireContentTypeJson) {
+    // Specify "Content-Type" other than "application/json".
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "text/html");
+
+    ASSERT_THROW(request_->create(), HttpRequestError);
+
+    // This time specify correct "Content-Type". It should pass.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+
+    EXPECT_NO_THROW(request_->create());
+}
+
+// This test verifies that PostHttpRequest requires "Content-Length"
+// header.
+TEST_F(PostHttpRequestJsonTest, requireContentLength) {
+    // "Content-Length" is not specified initially. It should fail.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Type", "text/html");
+
+    ASSERT_THROW(request_->create(), HttpRequestError);
+
+    // Specify "Content-Length". It should pass.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+}
+
+// This test verifies that JSON body can be retrieved from the
+// HTTP request.
+TEST_F(PostHttpRequestJsonTest, getBodyAsJson) {
+    // Create HTTP POST request with JSON body.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+    setBody();
+
+    ASSERT_NO_THROW(request_->finalize());
+
+    // Try to retrieve pointer to the root element of the JSON body.
+    ConstElementPtr json = request_->getBodyAsJson();
+    ASSERT_TRUE(json);
+
+    // Iterate over JSON values and store them in a simple map.
+    std::map<std::string, std::string> config_values;
+    for (auto config_element = json->mapValue().begin();
+         config_element != json->mapValue().end();
+         ++config_element) {
+        ASSERT_FALSE(config_element->first.empty());
+        ASSERT_TRUE(config_element->second);
+        config_values[config_element->first] = config_element->second->stringValue();
+    }
+
+    // Verify the values.
+    EXPECT_EQ("dhcp4", config_values["service"]);
+    EXPECT_EQ("foo", config_values["param1"]);
+}
+
+// This test verifies that an attempt to parse/retrieve malformed
+// JSON structure will cause an exception.
+TEST_F(PostHttpRequestJsonTest, getBodyAsJsonMalformed) {
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+    // No colon before 123.
+    setBody("{ \"command\" 123 }" );
+
+    EXPECT_THROW(request_->finalize(), HttpRequestJsonError);
+}
+
+// This test verifies that NULL pointer is returned when trying to
+// retrieve root element of the empty JSON structure.
+TEST_F(PostHttpRequestJsonTest, getEmptyJsonBody) {
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+
+    ASSERT_NO_THROW(request_->finalize());
+
+    ConstElementPtr json = request_->getBodyAsJson();
+    EXPECT_FALSE(json);
+}
+
+// This test verifies that the specific JSON element can be retrieved.
+TEST_F(PostHttpRequestJsonTest, getJsonElement) {
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+    setBody();
+
+    ASSERT_NO_THROW(request_->finalize());
+
+    ConstElementPtr element;
+    ASSERT_NO_THROW(element = request_->getJsonElement("service"));
+    ASSERT_TRUE(element);
+    EXPECT_EQ("dhcp4", element->stringValue());
+
+    // An attempt to retrieve non-existing element should return NULL.
+    EXPECT_FALSE(request_->getJsonElement("bar"));
+}
+
+// This test verifies that it is possible to create client side request
+// containing JSON body.
+TEST_F(PostHttpRequestJsonTest, clientRequest) {
+    request_->setDirection(HttpMessage::OUTBOUND);
+
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Type", "application/json");
+
+    ElementPtr json = Element::fromJSON(json_body_);
+    request_->setBodyAsJson(json);
+
+    // Commit and validate the data.
+    ASSERT_NO_THROW(request_->finalize());
+
+    std::ostringstream expected_request_text;
+    expected_request_text << "POST /isc/org HTTP/1.0\r\n"
+        "Content-Length: " << json->str().size() << "\r\n"
+        "Content-Type: application/json\r\n"
+        "\r\n"
+        << json->str();
+
+    EXPECT_EQ(expected_request_text.str(), request_->toString());
+}
+
+}
diff --git a/src/lib/http/tests/post_request_unittests.cc b/src/lib/http/tests/post_request_unittests.cc
new file mode 100644
index 0000000..18f2fda
--- /dev/null
+++ b/src/lib/http/tests/post_request_unittests.cc
@@ -0,0 +1,83 @@
+// Copyright (C) 2016-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <http/post_request.h>
+#include <http/tests/request_test.h>
+#include <gtest/gtest.h>
+
+using namespace isc::http;
+using namespace isc::http::test;
+
+namespace {
+
+/// @brief Test fixture class for @ref PostHttpRequest.
+class PostHttpRequestTest : public HttpRequestTestBase<PostHttpRequest> {
+public:
+
+    /// @brief Constructor.
+    PostHttpRequestTest()
+        : HttpRequestTestBase<PostHttpRequest>(),
+        json_body_("{ \"service\": \"dhcp4\", \"param1\": \"foo\" }") {
+    }
+
+    /// @brief Default value of the JSON body.
+    std::string json_body_;
+};
+
+// This test verifies that PostHttpRequest class only accepts POST
+// messages.
+TEST_F(PostHttpRequestTest, requirePost) {
+    // Use a GET method that is not supported.
+    setContextBasics("GET", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+
+    ASSERT_THROW(request_->create(), HttpRequestError);
+
+    // Now use POST. It should be accepted.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+
+    EXPECT_NO_THROW(request_->create());
+}
+
+// This test verifies that PostHttpRequest requires "Content-Length"
+// header.
+TEST_F(PostHttpRequestTest, requireContentType) {
+    // No "Content-Type". It should fail.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+
+    ASSERT_THROW(request_->create(), HttpRequestError);
+
+    // There is "Content-Type". It should pass.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "text/html");
+
+    EXPECT_NO_THROW(request_->create());
+
+}
+
+// This test verifies that PostHttpRequest requires "Content-Type"
+// header.
+TEST_F(PostHttpRequestTest, requireContentLength) {
+    // No "Content-Length". It should fail.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Type", "text/html");
+
+    ASSERT_THROW(request_->create(), HttpRequestError);
+
+    // There is "Content-Length". It should pass.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body_.length());
+    addHeaderToContext("Content-Type", "application/json");
+}
+
+}
diff --git a/src/lib/http/tests/request_parser_unittests.cc b/src/lib/http/tests/request_parser_unittests.cc
new file mode 100644
index 0000000..0756711
--- /dev/null
+++ b/src/lib/http/tests/request_parser_unittests.cc
@@ -0,0 +1,387 @@
+// Copyright (C) 2016-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cc/data.h>
+#include <http/http_types.h>
+#include <http/request_parser.h>
+#include <http/post_request_json.h>
+#include <gtest/gtest.h>
+#include <sstream>
+
+using namespace isc::data;
+using namespace isc::http;
+
+namespace {
+
+/// @brief Test fixture class for @ref HttpRequestParser.
+class HttpRequestParserTest : public ::testing::Test {
+public:
+
+    /// @brief Creates HTTP request string.
+    ///
+    /// @param preamble A string including HTTP request's first line
+    /// and all headers except "Content-Length".
+    /// @param payload A string containing HTTP request payload.
+    std::string createRequestString(const std::string& preamble,
+                                    const std::string& payload) {
+        std::ostringstream s;
+        s << preamble;
+        s << "Content-Length: " << payload.length() << "\r\n\r\n"
+          << payload;
+        return (s.str());
+    }
+
+    /// @brief Parses the HTTP request and checks that parsing was
+    /// successful.
+    ///
+    /// @param http_req HTTP request string.
+    void doParse(const std::string& http_req) {
+        HttpRequestParser parser(request_);
+        ASSERT_NO_THROW(parser.initModel());
+
+        parser.postBuffer(&http_req[0], http_req.size());
+        ASSERT_NO_THROW(parser.poll());
+
+        ASSERT_FALSE(parser.needData());
+        ASSERT_TRUE(parser.httpParseOk());
+        EXPECT_TRUE(parser.getErrorMessage().empty());
+    }
+
+    /// @brief Tests that parsing fails when malformed HTTP request
+    /// is received.
+    ///
+    /// @param http_req HTTP request string.
+    void testInvalidHttpRequest(const std::string& http_req) {
+        HttpRequestParser parser(request_);
+        ASSERT_NO_THROW(parser.initModel());
+
+        parser.postBuffer(&http_req[0], http_req.size());
+        ASSERT_NO_THROW(parser.poll());
+
+        EXPECT_FALSE(parser.needData());
+        EXPECT_FALSE(parser.httpParseOk());
+        EXPECT_FALSE(parser.getErrorMessage().empty());
+    }
+
+    /// @brief Instance of the HttpRequest used by the unit tests.
+    HttpRequest request_;
+};
+
+// Test test verifies that an HTTP request including JSON body is parsed
+// successfully.
+TEST_F(HttpRequestParserTest, postHttpRequestWithJson) {
+    std::string http_req = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n";
+    std::string json = "{ \"service\": \"dhcp4\", \"command\": \"shutdown\" }";
+
+    http_req = createRequestString(http_req, json);
+
+    // Create HTTP request which accepts POST method and JSON as a body.
+    PostHttpRequestJson request;
+
+    // Create a parser and make it use the request we created.
+    HttpRequestParser parser(request);
+    ASSERT_NO_THROW(parser.initModel());
+
+    // Simulate receiving HTTP request in chunks.
+    for (size_t i = 0; i < http_req.size(); i += http_req.size() / 10) {
+        bool done = false;
+        // Get the size of the data chunk. 
+        size_t chunk = http_req.size() / 10;
+        // When we're near the end of the data stream, the chunk length may
+        // vary.
+        if (i + chunk > http_req.size()) {
+            chunk = http_req.size() - i;
+            done = true;
+        }
+        // Feed the parser with a data chunk and parse it.
+        parser.postBuffer(&http_req[i], chunk);
+        parser.poll();
+        if (!done) {
+            ASSERT_TRUE(parser.needData());
+        }
+    }
+
+    // Parser should have parsed the request and should expect no more data.
+    ASSERT_FALSE(parser.needData());
+    // Parsing should be successful.
+    ASSERT_TRUE(parser.httpParseOk());
+    // There should be no error message.
+    EXPECT_TRUE(parser.getErrorMessage().empty());
+
+    // Verify parsed headers etc.
+    EXPECT_EQ(HttpRequest::Method::HTTP_POST, request.getMethod());
+    EXPECT_EQ("/foo/bar", request.getUri());
+    EXPECT_EQ("application/json", request.getHeaderValue("Content-Type"));
+    EXPECT_EQ(json.length(), request.getHeaderValueAsUint64("Content-Length"));
+    EXPECT_EQ(1, request.getHttpVersion().major_);
+    EXPECT_EQ(0, request.getHttpVersion().minor_);
+
+    // Try to retrieve values carried in JSON payload.
+    ConstElementPtr json_element;
+    ASSERT_NO_THROW(json_element = request.getJsonElement("service"));
+    EXPECT_EQ("dhcp4", json_element->stringValue());
+
+    ASSERT_NO_THROW(json_element = request.getJsonElement("command"));
+    EXPECT_EQ("shutdown", json_element->stringValue());
+}
+
+// This test verifies that extraneous data in the request will not cause
+// an error if "Content-Length" value refers to the length of the valid
+// part of the request.
+TEST_F(HttpRequestParserTest, extraneousDataInRequest) {
+    std::string http_req = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n";
+    std::string json = "{ \"service\": \"dhcp4\", \"command\": \"shutdown\" }";
+
+    // Create valid request;
+    http_req = createRequestString(http_req, json);
+
+    // Add some garbage at the end.
+    http_req += "some stuff which, if parsed, will cause errors";
+
+    // Create HTTP request which accepts POST method and JSON as a body.
+    PostHttpRequestJson request;
+
+    // Create a parser and make it use the request we created.
+    HttpRequestParser parser(request);
+    ASSERT_NO_THROW(parser.initModel());
+
+    // Feed the parser with the request containing some garbage at the end.
+    parser.postBuffer(&http_req[0], http_req.size());
+    ASSERT_NO_THROW(parser.poll());
+
+    // The parser should only parse the valid part of the request as indicated
+    // by the Content-Length.
+    ASSERT_FALSE(parser.needData());
+    ASSERT_TRUE(parser.httpParseOk());
+    // There should be no error message.
+    EXPECT_TRUE(parser.getErrorMessage().empty());
+
+    // Do another poll() to see if the parser will parse the garbage. We
+    // expect that it doesn't.
+    ASSERT_NO_THROW(parser.poll());
+    EXPECT_FALSE(parser.needData());
+    EXPECT_TRUE(parser.httpParseOk());
+    EXPECT_TRUE(parser.getErrorMessage().empty());
+}
+
+
+// This test verifies that LWS is parsed correctly. The LWS marks line breaks
+// in the HTTP header values.
+TEST_F(HttpRequestParserTest, getLWS) {
+    // "User-Agent" header contains line breaks with whitespaces in the new
+    // lines to mark continuation of the header value.
+    std::string http_req = "GET /foo/bar HTTP/1.1\r\n"
+        "Content-Type: text/html\r\n"
+        "User-Agent: Kea/1.2 Command \r\n"
+        " Control \r\n"
+        "\tClient\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_req));
+
+    // Verify parsed values.
+    EXPECT_EQ(HttpRequest::Method::HTTP_GET, request_.getMethod());
+    EXPECT_EQ("/foo/bar", request_.getUri());
+    EXPECT_EQ("text/html", request_.getHeaderValue("Content-Type"));
+    EXPECT_EQ("Kea/1.2 Command Control Client",
+              request_.getHeaderValue("User-Agent"));
+    EXPECT_EQ(1, request_.getHttpVersion().major_);
+    EXPECT_EQ(1, request_.getHttpVersion().minor_);
+}
+
+// This test verifies that the HTTP request with no headers is
+// parsed correctly.
+TEST_F(HttpRequestParserTest, noHeaders) {
+    std::string http_req = "GET /foo/bar HTTP/1.1\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_req));
+
+    // Verify the values.
+    EXPECT_EQ(HttpRequest::Method::HTTP_GET, request_.getMethod());
+    EXPECT_EQ("/foo/bar", request_.getUri());
+    EXPECT_EQ(1, request_.getHttpVersion().major_);
+    EXPECT_EQ(1, request_.getHttpVersion().minor_);
+}
+
+// This test verifies that the HTTP method can be specified in lower
+// case.
+TEST_F(HttpRequestParserTest, getLowerCase) {
+    std::string http_req = "get /foo/bar HTTP/1.1\r\n"
+        "Content-Type: text/html\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_req));
+
+    EXPECT_EQ(HttpRequest::Method::HTTP_GET, request_.getMethod());
+    EXPECT_EQ("/foo/bar", request_.getUri());
+    EXPECT_EQ("text/html", request_.getHeaderValue("Content-Type"));
+    EXPECT_EQ(1, request_.getHttpVersion().major_);
+    EXPECT_EQ(1, request_.getHttpVersion().minor_);
+}
+
+// This test verifies that headers are case insensitive.
+TEST_F(HttpRequestParserTest, headersCaseInsensitive) {
+    std::string http_req = "get /foo/bar HTTP/1.1\r\n"
+        "Content-type: text/html\r\n"
+        "connection: keep-Alive\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_req));
+
+    EXPECT_EQ(HttpRequest::Method::HTTP_GET, request_.getMethod());
+    EXPECT_EQ("/foo/bar", request_.getUri());
+    EXPECT_EQ("text/html", request_.getHeader("Content-Type")->getValue());
+    EXPECT_EQ("keep-alive", request_.getHeader("Connection")->getLowerCaseValue());
+    EXPECT_EQ(1, request_.getHttpVersion().major_);
+    EXPECT_EQ(1, request_.getHttpVersion().minor_);
+}
+
+// This test verifies that other value of the HTTP version can be
+// specified in the request.
+TEST_F(HttpRequestParserTest, http20) {
+    std::string http_req = "get /foo/bar HTTP/2.0\r\n"
+        "Content-Type: text/html\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_req));
+
+    EXPECT_EQ(HttpRequest::Method::HTTP_GET, request_.getMethod());
+    EXPECT_EQ("/foo/bar", request_.getUri());
+    EXPECT_EQ("text/html", request_.getHeaderValue("Content-Type"));
+    EXPECT_EQ(2, request_.getHttpVersion().major_);
+    EXPECT_EQ(0, request_.getHttpVersion().minor_);
+}
+
+// This test verifies that the header with no whitespace between the
+// colon and header value is accepted.
+TEST_F(HttpRequestParserTest, noHeaderWhitespace) {
+    std::string http_req = "get /foo/bar HTTP/1.0\r\n"
+        "Content-Type:text/html\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_req));
+
+    EXPECT_EQ(HttpRequest::Method::HTTP_GET, request_.getMethod());
+    EXPECT_EQ("/foo/bar", request_.getUri());
+    EXPECT_EQ("text/html", request_.getHeaderValue("Content-Type"));
+    EXPECT_EQ(1, request_.getHttpVersion().major_);
+    EXPECT_EQ(0, request_.getHttpVersion().minor_);
+}
+
+// This test verifies that the header value preceded with multiple
+// whitespaces is accepted.
+TEST_F(HttpRequestParserTest, multipleLeadingHeaderWhitespaces) {
+    std::string http_req = "get /foo/bar HTTP/1.0\r\n"
+        "Content-Type:     text/html\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_req));
+
+    EXPECT_EQ(HttpRequest::Method::HTTP_GET, request_.getMethod());
+    EXPECT_EQ("/foo/bar", request_.getUri());
+    EXPECT_EQ("text/html", request_.getHeaderValue("Content-Type"));
+    EXPECT_EQ(1, request_.getHttpVersion().major_);
+    EXPECT_EQ(0, request_.getHttpVersion().minor_);
+}
+
+// This test verifies that error is reported when unsupported HTTP
+// method is used.
+TEST_F(HttpRequestParserTest, unsupportedMethod) {
+    std::string http_req = "POSTX /foo/bar HTTP/2.0\r\n"
+        "Content-Type: text/html\r\n\r\n";
+    testInvalidHttpRequest(http_req);
+}
+
+// This test verifies that error is reported when URI contains
+// an invalid character.
+TEST_F(HttpRequestParserTest, invalidUri) {
+    std::string http_req = "POST /foo/\r HTTP/2.0\r\n"
+        "Content-Type: text/html\r\n\r\n";
+    testInvalidHttpRequest(http_req);
+}
+
+// This test verifies that the request containing a typo in the
+// HTTP version string causes parsing error.
+TEST_F(HttpRequestParserTest, invalidHTTPString) {
+    std::string http_req = "POST /foo/ HTLP/2.0\r\n"
+        "Content-Type: text/html\r\n\r\n";
+    testInvalidHttpRequest(http_req);
+}
+
+// This test verifies that error is reported when the HTTP version
+// string doesn't contain a slash character.
+TEST_F(HttpRequestParserTest, invalidHttpVersionNoSlash) {
+    std::string http_req = "POST /foo/ HTTP 1.1\r\n"
+        "Content-Type: text/html\r\n\r\n";
+    testInvalidHttpRequest(http_req);
+}
+
+// This test verifies that error is reported when HTTP version string
+// doesn't contain the minor version number.
+TEST_F(HttpRequestParserTest, invalidHttpNoMinorVersion) {
+    std::string http_req = "POST /foo/ HTTP/1\r\n"
+        "Content-Type: text/html\r\n\r\n";
+    testInvalidHttpRequest(http_req);
+}
+
+// This test verifies that error is reported when HTTP header name
+// contains an invalid character.
+TEST_F(HttpRequestParserTest, invalidHeaderName) {
+    std::string http_req = "POST /foo/ HTTP/1.1\r\n"
+        "Content-;: text/html\r\n\r\n";
+    testInvalidHttpRequest(http_req);
+}
+
+// This test verifies that error is reported when HTTP header value
+// is not preceded with the colon character.
+TEST_F(HttpRequestParserTest, noColonInHttpHeader) {
+    std::string http_req = "POST /foo/ HTTP/1.1\r\n"
+        "Content-Type text/html\r\n\r\n";
+    testInvalidHttpRequest(http_req);
+}
+
+// This test verifies that the input buffer of the HTTP request can be
+// retrieved as text formatted for logging.
+TEST_F(HttpRequestParserTest, getBufferAsString) {
+    std::string http_req = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n";
+
+    // Create HTTP request.
+    PostHttpRequestJson request;
+
+    // Create a parser and make it use the request we created.
+    HttpRequestParser parser(request);
+    ASSERT_NO_THROW(parser.initModel());
+
+    // Insert data into the request.
+    ASSERT_NO_THROW(parser.postBuffer(&http_req[0], http_req.size()));
+
+    // limit = 0 means no limit
+    EXPECT_EQ(http_req, parser.getBufferAsString(0));
+
+    // large enough limit should not cause the truncation.
+    EXPECT_EQ(http_req, parser.getBufferAsString(1024));
+
+    // Only 3 characters requested. The request should be truncated.
+    EXPECT_EQ("POS.........\n(truncating HTTP message larger than 3 characters)\n",
+              parser.getBufferAsString(3));
+}
+
+TEST_F(HttpRequestParserTest, parseEmptyRequest) {
+    std::string http_req = "POST / HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n";
+    std::string json = "";
+
+    http_req = createRequestString(http_req, json);
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_req));
+
+    EXPECT_EQ(HttpRequest::Method::HTTP_POST, request_.getMethod());
+    EXPECT_EQ("/", request_.getUri());
+    EXPECT_EQ("", request_.getBody());
+    EXPECT_EQ(1, request_.getHttpVersion().major_);
+    EXPECT_EQ(1, request_.getHttpVersion().minor_);
+}
+
+}
diff --git a/src/lib/http/tests/request_test.h b/src/lib/http/tests/request_test.h
new file mode 100644
index 0000000..f73b31f
--- /dev/null
+++ b/src/lib/http/tests/request_test.h
@@ -0,0 +1,82 @@
+// Copyright (C) 2016-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef HTTP_REQUEST_TEST_H
+#define HTTP_REQUEST_TEST_H
+
+#include <http/http_types.h>
+#include <http/request.h>
+#include <boost/lexical_cast.hpp>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <string>
+#include <utility>
+
+namespace isc {
+namespace http {
+namespace test {
+
+/// @brief Base test fixture class for testing @ref HttpRequest class and its
+/// derivations.
+///
+/// @tparam HttpRequestType Class under test.
+template<typename HttpRequestType>
+class HttpRequestTestBase : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// Creates HTTP request to be used in unit tests.
+    HttpRequestTestBase()
+        : request_(new HttpRequestType()) {
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Does nothing.
+    virtual ~HttpRequestTestBase() {
+    }
+
+    /// @brief Initializes HTTP request context with basic information.
+    ///
+    /// It sets:
+    /// - HTTP method,
+    /// - URI,
+    /// - HTTP version number.
+    ///
+    /// @param method HTTP method as string.
+    /// @param uri URI.
+    /// @param version A pair of values of which the first is the major HTTP
+    /// version and the second is the minor HTTP version.
+    void setContextBasics(const std::string& method, const std::string& uri,
+                          const HttpVersion& version) {
+        request_->context()->method_ = method;
+        request_->context()->uri_ = uri;
+        request_->context()->http_version_major_ = version.major_;
+        request_->context()->http_version_minor_ = version.minor_;
+    }
+
+    /// @brief Adds HTTP header to the context.
+    ///
+    /// @param header_name HTTP header name.
+    /// @param header_value HTTP header value. This value will be converted to
+    /// a string using @c boost::lexical_cast.
+    /// @tparam ValueType Header value type.
+    template<typename ValueType>
+    void addHeaderToContext(const std::string& header_name,
+                            const ValueType& header_value) {
+        request_->context()->headers_.push_back(HttpHeaderContext(header_name, header_value));
+    }
+
+    /// @brief Instance of the @ref HttpRequest or its derivation.
+    boost::shared_ptr<HttpRequestType> request_;
+};
+
+} // namespace test
+} // namespace http
+} // namespace isc
+
+#endif
diff --git a/src/lib/http/tests/request_unittests.cc b/src/lib/http/tests/request_unittests.cc
new file mode 100644
index 0000000..f902400
--- /dev/null
+++ b/src/lib/http/tests/request_unittests.cc
@@ -0,0 +1,422 @@
+// Copyright (C) 2016-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <http/request.h>
+#include <http/date_time.h>
+#include <http/http_header.h>
+#include <http/http_types.h>
+#include <http/tests/request_test.h>
+#include <boost/lexical_cast.hpp>
+#include <gtest/gtest.h>
+#include <utility>
+
+using namespace isc::http;
+using namespace isc::http::test;
+
+namespace {
+
+/// @brief Test fixture class for @c HttpRequest class.
+class HttpRequestTest : public HttpRequestTestBase<HttpRequest> {
+public:
+
+    /// @brief Tests connection persistence for the given HTTP version
+    /// and header value.
+    ///
+    /// This method creates a dummy HTTP request and sets the specified
+    /// version and header. Next, it returns the value if @c isPersistent
+    /// method for this request. The unit test verifies this value for
+    /// correctness.
+    ///
+    /// @param http_version HTTP version.
+    /// @param http_header HTTP header to be included in the request. If
+    /// the header has an empty value, it is not included.
+    ///
+    /// @return true if request indicates that connection is to be
+    /// persistent.
+    bool isPersistent(const HttpVersion& http_version,
+                      const HttpHeader& http_header = HttpHeader("Connection")) {
+        try {
+            // We need to add some JSON body.
+            std::string json_body = "{ \"param1\": \"foo\" }";
+
+            // Set method, path, version and content length.
+            setContextBasics("POST", "/isc/org", http_version);
+            addHeaderToContext("Content-Length", json_body.length());
+
+            // If additional header has been specified (typically "Connection"),
+            // include it.
+            if (!http_header.getValue().empty()) {
+                addHeaderToContext(http_header.getName(), http_header.getValue());
+            }
+            // Attach JSON body.
+            request_->context()->body_ = json_body;
+            request_->create();
+
+        } catch (...) {
+            ADD_FAILURE() << "failed to create HTTP request while testing"
+                " connection persistence";
+        }
+
+        return (request_->isPersistent());
+    }
+
+};
+
+// This test verifies that a minimal request can be created.
+TEST_F(HttpRequestTest, minimal) {
+    setContextBasics("GET", "/isc/org", HttpVersion(1, 1));
+    ASSERT_NO_THROW(request_->create());
+
+    EXPECT_EQ(HttpRequest::Method::HTTP_GET, request_->getMethod());
+    EXPECT_EQ("/isc/org", request_->getUri());
+    EXPECT_EQ(1, request_->getHttpVersion().major_);
+    EXPECT_EQ(1, request_->getHttpVersion().minor_);
+    EXPECT_TRUE(request_->getRemote().empty());
+    request_->setRemote("127.0.0.1");
+    EXPECT_EQ("127.0.0.1", request_->getRemote());
+
+    EXPECT_THROW(request_->getHeaderValue("Content-Length"),
+                 HttpMessageNonExistingHeader);
+}
+
+// This test verifies that empty Host header is included in the
+// request if it is not explicitly specified.
+TEST_F(HttpRequestTest, hostHeaderDefault) {
+    ASSERT_NO_THROW(request_.reset(new HttpRequest(HttpRequest::Method::HTTP_GET,
+                                                   "/isc/org",
+                                                   HttpVersion(1, 0))));
+
+    ASSERT_NO_THROW(request_->finalize());
+
+    EXPECT_EQ(HttpRequest::Method::HTTP_GET, request_->getMethod());
+    EXPECT_EQ("/isc/org", request_->getUri());
+    EXPECT_EQ(1, request_->getHttpVersion().major_);
+    EXPECT_EQ(0, request_->getHttpVersion().minor_);
+
+    std::string host_hdr;
+    ASSERT_NO_THROW(host_hdr = request_->getHeaderValue("Host"));
+    EXPECT_TRUE(host_hdr.empty());
+}
+
+// This test verifies that it is possible to explicitly specify a
+// Host header value while creating a request.
+TEST_F(HttpRequestTest, hostHeaderCustom) {
+    ASSERT_NO_THROW(request_.reset(new HttpRequest(HttpRequest::Method::HTTP_GET,
+                                                   "/isc/org",
+                                                   HttpVersion(1, 1),
+                                                   HostHttpHeader("www.example.org"))));
+
+    ASSERT_NO_THROW(request_->finalize());
+
+    EXPECT_EQ(HttpRequest::Method::HTTP_GET, request_->getMethod());
+    EXPECT_EQ("/isc/org", request_->getUri());
+    EXPECT_EQ(1, request_->getHttpVersion().major_);
+    EXPECT_EQ(1, request_->getHttpVersion().minor_);
+
+    std::string host_hdr;
+    ASSERT_NO_THROW(host_hdr = request_->getHeaderValue("Host"));
+    EXPECT_EQ("www.example.org", host_hdr);
+}
+
+// This test verifies that headers can be included in a request.
+TEST_F(HttpRequestTest, includeHeaders) {
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", "1024");
+    addHeaderToContext("Content-Type", "application/json");
+    ASSERT_NO_THROW(request_->create());
+
+    EXPECT_EQ(HttpRequest::Method::HTTP_POST, request_->getMethod());
+    EXPECT_EQ("/isc/org", request_->getUri());
+    EXPECT_EQ(1, request_->getHttpVersion().major_);
+    EXPECT_EQ(0, request_->getHttpVersion().minor_);
+
+    std::string content_type;
+    ASSERT_NO_THROW(content_type = request_->getHeaderValue("Content-Type"));
+    EXPECT_EQ("application/json", content_type);
+
+    uint64_t content_length;
+    ASSERT_NO_THROW(
+        content_length = request_->getHeaderValueAsUint64("Content-Length")
+    );
+    EXPECT_EQ(1024, content_length);
+}
+
+// This test verifies that it is possible to specify required
+// methods for the request and that an error is thrown if the
+// selected method doesn't match.
+TEST_F(HttpRequestTest, requiredMethods) {
+    request_->requireHttpMethod(HttpRequest::Method::HTTP_GET);
+    request_->requireHttpMethod(HttpRequest::Method::HTTP_POST);
+
+    setContextBasics("GET", "/isc/org", HttpVersion(1, 1));
+
+    ASSERT_NO_THROW(request_->create());
+
+    request_->context()->method_ = "POST";
+    ASSERT_NO_THROW(request_->create());
+
+    request_->context()->method_ = "PUT";
+    EXPECT_THROW(request_->create(), HttpRequestError);
+}
+
+// This test verifies that it is possible to specify required
+// HTTP version for the request and that an error is thrown if
+// the selected HTTP version doesn't match.
+TEST_F(HttpRequestTest, requiredHttpVersion) {
+    request_->requireHttpVersion(HttpVersion(1, 0));
+    request_->requireHttpVersion(HttpVersion(1, 1));
+
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    EXPECT_NO_THROW(request_->create());
+
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 1));
+    EXPECT_NO_THROW(request_->create());
+
+    setContextBasics("POST", "/isc/org", HttpVersion(2, 0));
+    EXPECT_THROW(request_->create(), HttpRequestError);
+}
+
+// This test verifies that it is possible to specify required
+// HTTP headers for the request and that an error is thrown if
+// the required header is not included.
+TEST_F(HttpRequestTest, requiredHeader) {
+    request_->requireHeader("Content-Length");
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+
+    ASSERT_THROW(request_->create(), HttpRequestError);
+
+    addHeaderToContext("Content-Type", "application/json");
+    ASSERT_THROW(request_->create(), HttpRequestError);
+
+    addHeaderToContext("Content-Length", "2048");
+    EXPECT_NO_THROW(request_->create());
+}
+
+// This test verifies that it is possible to specify required
+// HTTP header value for the request and that an error is thrown
+// if the value doesn't match.
+TEST_F(HttpRequestTest, requiredHeaderValue) {
+    request_->requireHeaderValue("Content-Type", "application/json");
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Type", "text/html");
+
+    ASSERT_THROW(request_->create(), HttpRequestError);
+
+    addHeaderToContext("Content-Type", "application/json");
+
+    EXPECT_NO_THROW(request_->create());
+}
+
+// This test verifies that an error is thrown upon an attempt to
+// fetch request properties before the request is finalized.
+TEST_F(HttpRequestTest, notCreated) {
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Type", "text/html");
+    addHeaderToContext("Content-Length", "1024");
+
+    EXPECT_THROW(static_cast<void>(request_->getMethod()), HttpMessageError);
+    EXPECT_THROW(static_cast<void>(request_->getHttpVersion()),
+                 HttpMessageError);
+    EXPECT_THROW(static_cast<void>(request_->getUri()), HttpMessageError);
+    EXPECT_THROW(static_cast<void>(request_->getHeaderValue("Content-Type")),
+                 HttpMessageError);
+    EXPECT_THROW(static_cast<void>(request_->getHeaderValueAsUint64("Content-Length")),
+                 HttpMessageError);
+    EXPECT_THROW(static_cast<void>(request_->getBody()), HttpMessageError);
+
+    ASSERT_NO_THROW(request_->finalize());
+
+    EXPECT_NO_THROW(static_cast<void>(request_->getMethod()));
+    EXPECT_NO_THROW(static_cast<void>(request_->getHttpVersion()));
+    EXPECT_NO_THROW(static_cast<void>(request_->getUri()));
+    EXPECT_NO_THROW(static_cast<void>(request_->getHeaderValue("Content-Type")));
+    EXPECT_NO_THROW(
+        static_cast<void>(request_->getHeaderValueAsUint64("Content-Length"))
+    );
+    EXPECT_NO_THROW(static_cast<void>(request_->getBody()));
+}
+
+// This test verifies that it is possible to fetch the request
+// body.
+TEST_F(HttpRequestTest, getBody) {
+    std::string json_body = "{ \"param1\": \"foo\" }";
+
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 0));
+    addHeaderToContext("Content-Length", json_body.length());
+
+    request_->context()->body_ = json_body;
+
+    ASSERT_NO_THROW(request_->finalize());
+
+    EXPECT_EQ(json_body, request_->getBody());
+}
+
+// This test verifies the behavior of the requiresBody function.
+TEST_F(HttpRequestTest, requiresBody) {
+    ASSERT_FALSE(request_->requiresBody());
+    request_->requireHeader("Content-Length");
+    EXPECT_TRUE(request_->requiresBody());
+}
+
+// This test verifies that HTTP/1.0 connections are not persistent
+// by default.
+TEST_F(HttpRequestTest, isPersistentHttp10) {
+    // In HTTP 1.0 the connection is by default non-persistent.
+    EXPECT_FALSE(isPersistent(HttpVersion(1, 0)));
+}
+
+// This test verifies that HTTP/1.1 connections are persistent
+// by default.
+TEST_F(HttpRequestTest, isPersistentHttp11) {
+    // In HTTP 1.1 the connection is by default persistent.
+    EXPECT_TRUE(isPersistent(HttpVersion(1, 1)));
+}
+
+// This test verifies that HTTP/1.0 connection becomes persistent
+// when keep-alive value of the Connection header is included.
+TEST_F(HttpRequestTest, isPersistentHttp10KeepAlive) {
+    // In HTTP 1.0 the client indicates that the connection is desired to be
+    // persistent by including "Connection: keep-alive" header.
+    EXPECT_TRUE(
+        isPersistent(HttpVersion(1, 0), HttpHeader("Connection", "Keep-alive"))
+    );
+}
+
+// This test verifies that HTTP/1.1 connection is closed when the
+// close value of the Connection header is included.
+TEST_F(HttpRequestTest, isPersistentHttp11Close) {
+    // In HTTP 1.1 the client would include "Connection: close" header if it
+    // desires to close the connection.
+    EXPECT_FALSE(
+        isPersistent(HttpVersion(1, 1), HttpHeader("Connection", "close"))
+    );
+}
+
+// This test verifies the contents of the HTTP outbound request.
+TEST_F(HttpRequestTest, clientRequest) {
+    ASSERT_NO_THROW(
+        request_.reset(new HttpRequest(HttpRequest::Method::HTTP_POST,
+                                       "/isc/org",
+                                       HttpVersion(1, 0),
+                                       HostHttpHeader("www.example.org")));
+    );
+
+    // Capture current date and time.
+    HttpDateTime date_time;
+
+    // Add headers.
+    request_->context()->headers_.push_back(HttpHeaderContext("Date", date_time.rfc1123Format()));
+    request_->context()->headers_.push_back(HttpHeaderContext("Content-Type", "text/html"));
+    request_->context()->headers_.push_back(HttpHeaderContext("Accept", "text/html"));
+    // Add a body.
+    request_->context()->body_ = "<html></html>";
+    // Commit and validate the data.
+    ASSERT_NO_THROW(request_->finalize());
+
+    // Check that the HTTP request in the textual format is correct. Note that
+    // it should include "Content-Length", even though we haven't explicitly set
+    // this header. It is dynamically computed from the body size.
+    EXPECT_EQ("POST /isc/org HTTP/1.0\r\n"
+              "Host: www.example.org\r\n"
+              "Accept: text/html\r\n"
+              "Content-Length: 13\r\n"
+              "Content-Type: text/html\r\n"
+              "Date: " + date_time.rfc1123Format() + "\r\n"
+              "\r\n"
+              "<html></html>",
+              request_->toString());
+}
+
+// This test verifies the contents of the HTTP outbound request
+// which lacks body.
+TEST_F(HttpRequestTest, clientRequestNoBody) {
+    setContextBasics("GET", "/isc/org", HttpVersion(1, 1));
+    // Add headers.
+    request_->context()->headers_.push_back(HttpHeaderContext("Content-Type", "text/html"));
+    // Commit and validate the data.
+    ASSERT_NO_THROW(request_->finalize());
+
+    // Check that the HTTP request in the textual format is correct. Note that
+    // there should be no Content-Length included, because the body is empty.
+    EXPECT_EQ("GET /isc/org HTTP/1.1\r\n"
+              "Content-Type: text/html\r\n"
+              "\r\n",
+              request_->toString());
+}
+
+// This test verifies the first line of the HTTP request.
+TEST_F(HttpRequestTest, toBriefString) {
+    // Create the request.
+    setContextBasics("POST", "/isc/org", HttpVersion(1, 1));
+    // Add headers.
+    request_->context()->headers_.push_back(HttpHeaderContext("Content-Type", "application/json"));
+    // Must be finalized before can be used.
+    ASSERT_NO_THROW(request_->finalize());
+    // Check that the brief string is correct.
+    EXPECT_EQ("POST /isc/org HTTP/1.1", request_->toBriefString());
+}
+
+// This test verifies that no basic HTTP authentication is supported.
+TEST_F(HttpRequestTest, noBasicAuth) {
+    ASSERT_NO_THROW(request_.reset(new HttpRequest(HttpRequest::Method::HTTP_GET,
+                                                   "/isc/org",
+                                                   HttpVersion(1, 1),
+                                                   HostHttpHeader("www.example.org"))));
+
+    ASSERT_NO_THROW(request_->finalize());
+    ASSERT_THROW(request_->getHeader("Authorization"),
+                 HttpMessageNonExistingHeader);
+}
+
+// This test verifies that basic HTTP authentication works as expected.
+TEST_F(HttpRequestTest, basicAuth) {
+    BasicHttpAuthPtr basic_auth;
+    EXPECT_NO_THROW(basic_auth.reset(new BasicHttpAuth("foo", "bar")));
+    ASSERT_TRUE(basic_auth);
+
+    ASSERT_NO_THROW(request_.reset(new HttpRequest(HttpRequest::Method::HTTP_GET,
+                                                   "/isc/org",
+                                                   HttpVersion(1, 1),
+                                                   HostHttpHeader("www.example.org"),
+                                                   basic_auth)));
+
+    ASSERT_NO_THROW(request_->finalize());
+
+    std::string value;
+    EXPECT_NO_THROW(value = request_->getHeaderValue("Authorization"));
+    EXPECT_EQ(value, "Basic " + basic_auth->getCredential());
+}
+
+/// This test verifies that access parameters are handled as expected.
+TEST_F(HttpRequestTest, parameters) {
+    setContextBasics("GET", "/isc/org", HttpVersion(1, 1));
+    ASSERT_NO_THROW(request_->create());
+
+    EXPECT_TRUE(request_->getRemote().empty());
+    EXPECT_FALSE(request_->getTls());
+    EXPECT_TRUE(request_->getSubject().empty());
+    EXPECT_TRUE(request_->getIssuer().empty());
+    EXPECT_TRUE(request_->getBasicAuth().empty());
+    EXPECT_TRUE(request_->getCustom().empty());
+
+    request_->setRemote("my-remote");
+    request_->setTls(true);
+    request_->setSubject("my-subject");
+    request_->setIssuer("my-issuer");
+    request_->setBasicAuth("foo");
+    request_->setCustom("bar");
+
+    EXPECT_EQ("my-remote", request_->getRemote());
+    EXPECT_TRUE(request_->getTls());
+    EXPECT_EQ("my-subject", request_->getSubject());
+    EXPECT_EQ("my-issuer", request_->getIssuer());
+    EXPECT_EQ("foo", request_->getBasicAuth());
+    EXPECT_EQ("bar", request_->getCustom());
+}
+
+}
diff --git a/src/lib/http/tests/response_creator_unittests.cc b/src/lib/http/tests/response_creator_unittests.cc
new file mode 100644
index 0000000..c5370cf
--- /dev/null
+++ b/src/lib/http/tests/response_creator_unittests.cc
@@ -0,0 +1,340 @@
+// Copyright (C) 2016-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <http/basic_auth.h>
+#include <http/basic_auth_config.h>
+#include <http/http_types.h>
+#include <http/request.h>
+#include <http/response.h>
+#include <http/response_creator.h>
+#include <http/response_json.h>
+#include <http/tests/response_test.h>
+#include <testutils/log_utils.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace isc::dhcp::test;
+using namespace isc::http;
+using namespace isc::http::test;
+using namespace std;
+
+namespace {
+
+/// @brief Test HTTP response.
+typedef TestHttpResponseBase<HttpResponseJson> Response;
+
+/// @brief Pointer to test HTTP response.
+typedef boost::shared_ptr<Response> ResponsePtr;
+
+/// @brief Implementation of the @ref HttpResponseCreator.
+class TestHttpResponseCreator : public HttpResponseCreator {
+public:
+
+    /// @brief Create a new request.
+    ///
+    /// @return Pointer to the new instance of the @ref HttpRequest.
+    virtual HttpRequestPtr
+    createNewHttpRequest() const {
+        return (HttpRequestPtr(new HttpRequest()));
+    }
+
+private:
+
+    /// @brief Creates HTTP response.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP response.
+    virtual HttpResponsePtr
+    createStockHttpResponse(const HttpRequestPtr& request,
+                            const HttpStatusCode& status_code) const {
+        // The request hasn't been finalized so the request object
+        // doesn't contain any information about the HTTP version number
+        // used. But, the context should have this data (assuming the
+        // HTTP version is parsed ok).
+        HttpVersion http_version(request->context()->http_version_major_,
+                                 request->context()->http_version_minor_);
+        // This will generate the response holding JSON content.
+        ResponsePtr response(new Response(http_version, status_code));
+        response->finalize();
+        return (response);
+    }
+
+    /// @brief Creates HTTP response.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP OK response with no content.
+    virtual HttpResponsePtr
+    createDynamicHttpResponse(HttpRequestPtr request) {
+        // The simplest thing is to create a response with no content.
+        // We don't need content to test our class.
+        ResponsePtr response(new Response(request->getHttpVersion(),
+                                          HttpStatusCode::OK));
+        response->finalize();
+        return (response);
+    }
+};
+
+/// @brief Pointer to test HTTP response creator.
+typedef boost::shared_ptr<TestHttpResponseCreator> TestHttpResponseCreatorPtr;
+
+// This test verifies that Bad Request status is generated when the request
+// hasn't been finalized.
+TEST(HttpResponseCreatorTest, badRequest) {
+    HttpResponsePtr response;
+    // Create a request but do not finalize it.
+    HttpRequestPtr request(new HttpRequest());
+    request->context()->http_version_major_ = 1;
+    request->context()->http_version_minor_ = 0;
+    request->context()->method_ = "GET";
+    request->context()->uri_ = "/foo";
+
+    // Use test specific implementation of Response Creator. It should
+    // generate HTTP error 400.
+    TestHttpResponseCreator creator;
+    ASSERT_NO_THROW(response = creator.createHttpResponse(request));
+    ASSERT_TRUE(response);
+
+    EXPECT_EQ("HTTP/1.0 400 Bad Request\r\n"
+              "Content-Length: 40\r\n"
+              "Content-Type: application/json\r\n"
+              "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n\r\n"
+              "{ \"result\": 400, \"text\": \"Bad Request\" }",
+              response->toString());
+}
+
+// This test verifies that response is generated successfully from the
+// finalized/parsed request.
+TEST(HttpResponseCreatorTest, goodRequest) {
+    // There is no credentials so it checks also what happens when
+    // authentication is not required.
+
+    HttpResponsePtr response;
+    // Create request and finalize it.
+    HttpRequestPtr request(new HttpRequest());
+    request->context()->http_version_major_ = 1;
+    request->context()->http_version_minor_ = 0;
+    request->context()->method_ = "GET";
+    request->context()->uri_ = "/foo";
+    ASSERT_NO_THROW(request->finalize());
+
+    // Use test specific implementation of the Response Creator to generate
+    // a response.
+    TestHttpResponseCreator creator;
+    ASSERT_NO_THROW(response = creator.createHttpResponse(request));
+    ASSERT_TRUE(response);
+
+    EXPECT_EQ("HTTP/1.0 200 OK\r\n"
+              "Content-Length: 0\r\n"
+              "Content-Type: application/json\r\n"
+              "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n\r\n",
+              response->toString());
+}
+
+/// @brief Test fixture for HTTP response creator authentication.
+class HttpResponseCreatorAuthTest : public LogContentTest { };
+
+// This test verifies that missing required authentication header gives
+// unauthorized error.
+TEST_F(HttpResponseCreatorAuthTest, noAuth) {
+    // Create basic HTTP authentication configuration.
+    BasicHttpAuthConfigPtr auth_config(new BasicHttpAuthConfig());
+    EXPECT_NO_THROW(auth_config->add("test", "", "123\xa3", ""));
+    const BasicHttpAuthMap& credentials = auth_config->getCredentialMap();
+    auto cred = credentials.find("dGVzdDoxMjPCow==");
+    EXPECT_NE(cred, credentials.end());
+    EXPECT_EQ(cred->second, "test");
+    auth_config->setRealm("ISC.ORG");
+
+    // Create request and finalize it.
+    HttpRequestPtr request(new HttpRequest());
+    request->context()->http_version_major_ = 1;
+    request->context()->http_version_minor_ = 0;
+    request->context()->method_ = "GET";
+    request->context()->uri_ = "/foo";
+    ASSERT_NO_THROW(request->finalize());
+    HttpRequest::recordBasicAuth_ = true;
+
+    HttpResponsePtr response;
+    TestHttpResponseCreatorPtr creator(new TestHttpResponseCreator());;
+    ASSERT_NO_THROW(response = auth_config->checkAuth(*creator, request));
+    ASSERT_TRUE(response);
+
+    EXPECT_EQ("HTTP/1.0 401 Unauthorized\r\n"
+              "Content-Length: 41\r\n"
+              "Content-Type: application/json\r\n"
+              "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+              "WWW-Authenticate: Basic realm=\"ISC.ORG\"\r\n\r\n"
+              "{ \"result\": 401, \"text\": \"Unauthorized\" }",
+              response->toString());
+
+    EXPECT_TRUE(request->getBasicAuth().empty());
+    addString("HTTP_CLIENT_REQUEST_NO_AUTH_HEADER received HTTP request "
+              "without required authentication header");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies that too short authentication header is rejected.
+TEST_F(HttpResponseCreatorAuthTest, authTooShort) {
+    // Create basic HTTP authentication configuration.
+    BasicHttpAuthConfigPtr auth_config(new BasicHttpAuthConfig());
+    EXPECT_NO_THROW(auth_config->add("test", "", "123\xa3", ""));
+    const BasicHttpAuthMap& credentials = auth_config->getCredentialMap();
+    auto cred = credentials.find("dGVzdDoxMjPCow==");
+    EXPECT_NE(cred, credentials.end());
+    EXPECT_EQ(cred->second, "test");
+    auth_config->setRealm("ISC.ORG");
+
+    // Create request and finalize it.
+    HttpRequestPtr request(new HttpRequest());
+    request->context()->http_version_major_ = 1;
+    request->context()->http_version_minor_ = 0;
+    request->context()->method_ = "GET";
+    request->context()->uri_ = "/foo";
+    HttpHeaderContext auth("Authorization", "Basic =");
+    request->context()->headers_.push_back(auth);
+    ASSERT_NO_THROW(request->finalize());
+    HttpRequest::recordBasicAuth_ = true;
+
+    HttpResponsePtr response;
+    TestHttpResponseCreatorPtr creator(new TestHttpResponseCreator());;
+    ASSERT_NO_THROW(response = auth_config->checkAuth(*creator, request));
+    ASSERT_TRUE(response);
+
+    EXPECT_EQ("HTTP/1.0 401 Unauthorized\r\n"
+              "Content-Length: 41\r\n"
+              "Content-Type: application/json\r\n"
+              "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+              "WWW-Authenticate: Basic realm=\"ISC.ORG\"\r\n\r\n"
+              "{ \"result\": 401, \"text\": \"Unauthorized\" }",
+              response->toString());
+
+    EXPECT_TRUE(request->getBasicAuth().empty());
+    addString("HTTP_CLIENT_REQUEST_BAD_AUTH_HEADER received HTTP request "
+              "with malformed authentication header: "
+              "header content is too short");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies that another authentication schema is rejected.
+TEST_F(HttpResponseCreatorAuthTest, badScheme) {
+    // Create basic HTTP authentication configuration.
+    BasicHttpAuthConfigPtr auth_config(new BasicHttpAuthConfig());
+    EXPECT_NO_THROW(auth_config->add("test", "", "123\xa3", ""));
+    const BasicHttpAuthMap& credentials = auth_config->getCredentialMap();
+    auto cred = credentials.find("dGVzdDoxMjPCow==");
+    EXPECT_NE(cred, credentials.end());
+    EXPECT_EQ(cred->second, "test");
+    auth_config->setRealm("ISC.ORG");
+
+    // Create request and finalize it.
+    HttpRequestPtr request(new HttpRequest());
+    request->context()->http_version_major_ = 1;
+    request->context()->http_version_minor_ = 0;
+    request->context()->method_ = "GET";
+    request->context()->uri_ = "/foo";
+    HttpHeaderContext auth("Authorization", "Basis dGVzdDoxMjPCow==");
+    request->context()->headers_.push_back(auth);
+    ASSERT_NO_THROW(request->finalize());
+    HttpRequest::recordBasicAuth_ = true;
+
+    HttpResponsePtr response;
+    TestHttpResponseCreatorPtr creator(new TestHttpResponseCreator());;
+    ASSERT_NO_THROW(response = auth_config->checkAuth(*creator, request));
+    ASSERT_TRUE(response);
+
+    EXPECT_EQ("HTTP/1.0 401 Unauthorized\r\n"
+              "Content-Length: 41\r\n"
+              "Content-Type: application/json\r\n"
+              "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+              "WWW-Authenticate: Basic realm=\"ISC.ORG\"\r\n\r\n"
+              "{ \"result\": 401, \"text\": \"Unauthorized\" }",
+              response->toString());
+
+    EXPECT_TRUE(request->getBasicAuth().empty());
+    addString("HTTP_CLIENT_REQUEST_BAD_AUTH_HEADER received HTTP request "
+              "with malformed authentication header: "
+              "not basic authentication");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies that not matching credential is rejected.
+TEST_F(HttpResponseCreatorAuthTest, notMatching) {
+    // Create basic HTTP authentication configuration.
+    BasicHttpAuthConfigPtr auth_config(new BasicHttpAuthConfig());
+    EXPECT_NO_THROW(auth_config->add("test", "", "123\xa3", ""));
+    const BasicHttpAuthMap& credentials = auth_config->getCredentialMap();
+    auto cred = credentials.find("dGVzdDoxMjPCow==");
+    EXPECT_NE(cred, credentials.end());
+    EXPECT_EQ(cred->second, "test");
+    auth_config->setRealm("ISC.ORG");
+
+    // Create request and finalize it.
+    HttpRequestPtr request(new HttpRequest());
+    request->context()->http_version_major_ = 1;
+    request->context()->http_version_minor_ = 0;
+    request->context()->method_ = "GET";
+    request->context()->uri_ = "/foo";
+    // Slightly different credential...
+    HttpHeaderContext auth("Authorization", "Basic dGvZdDoxMjPcOw==");
+    request->context()->headers_.push_back(auth);
+    ASSERT_NO_THROW(request->finalize());
+    HttpRequest::recordBasicAuth_ = true;
+
+    HttpResponsePtr response;
+    TestHttpResponseCreatorPtr creator(new TestHttpResponseCreator());;
+    ASSERT_NO_THROW(response = auth_config->checkAuth(*creator, request));
+    ASSERT_TRUE(response);
+
+    EXPECT_EQ("HTTP/1.0 401 Unauthorized\r\n"
+              "Content-Length: 41\r\n"
+              "Content-Type: application/json\r\n"
+              "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+              "WWW-Authenticate: Basic realm=\"ISC.ORG\"\r\n\r\n"
+              "{ \"result\": 401, \"text\": \"Unauthorized\" }",
+              response->toString());
+
+    EXPECT_TRUE(request->getBasicAuth().empty());
+    addString("HTTP_CLIENT_REQUEST_NOT_AUTHORIZED received HTTP request "
+              "with not matching authentication header");
+    EXPECT_TRUE(checkFile());
+}
+
+// This test verifies that matching credential is accepted.
+TEST_F(HttpResponseCreatorAuthTest, matching) {
+    // Create basic HTTP authentication configuration.
+    BasicHttpAuthConfigPtr auth_config(new BasicHttpAuthConfig());
+    EXPECT_NO_THROW(auth_config->add("test", "", "123\xa3", ""));
+    const BasicHttpAuthMap& credentials = auth_config->getCredentialMap();
+    auto cred = credentials.find("dGVzdDoxMjPCow==");
+    EXPECT_NE(cred, credentials.end());
+    EXPECT_EQ(cred->second, "test");
+    auth_config->setRealm("ISC.ORG");
+
+    // Create request and finalize it.
+    HttpRequestPtr request(new HttpRequest());
+    request->context()->http_version_major_ = 1;
+    request->context()->http_version_minor_ = 0;
+    request->context()->method_ = "GET";
+    request->context()->uri_ = "/foo";
+    HttpHeaderContext auth("Authorization", "Basic dGVzdDoxMjPCow==");
+    request->context()->headers_.push_back(auth);
+    ASSERT_NO_THROW(request->finalize());
+    HttpRequest::recordBasicAuth_ = true;
+
+    HttpResponsePtr response;
+    TestHttpResponseCreatorPtr creator(new TestHttpResponseCreator());;
+    ASSERT_NO_THROW(response = auth_config->checkAuth(*creator, request));
+    EXPECT_FALSE(response);
+
+    EXPECT_EQ("test", request->getBasicAuth());
+    addString("HTTP_CLIENT_REQUEST_AUTHORIZED received HTTP request "
+              "authorized for 'test'");
+    EXPECT_TRUE(checkFile());
+    HttpRequest::recordBasicAuth_ = false;
+}
+
+}
diff --git a/src/lib/http/tests/response_json_unittests.cc b/src/lib/http/tests/response_json_unittests.cc
new file mode 100644
index 0000000..e3829b5
--- /dev/null
+++ b/src/lib/http/tests/response_json_unittests.cc
@@ -0,0 +1,151 @@
+// Copyright (C) 2016-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <cc/data.h>
+#include <http/http_types.h>
+#include <http/response_json.h>
+#include <http/tests/response_test.h>
+#include <gtest/gtest.h>
+#include <sstream>
+
+using namespace isc::data;
+using namespace isc::http;
+using namespace isc::http::test;
+
+namespace {
+
+/// @brief Response type used in tests.
+typedef TestHttpResponseBase<HttpResponseJson> TestHttpResponseJson;
+
+/// @brief Test fixture class for @ref HttpResponseJson.
+class HttpResponseJsonTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// Initializes the following class members:
+    /// - json_string_ - which is a pretty formatted JSON content,
+    /// - json_ - A structure of Element objects representing the JSON,
+    /// - json_string_from_json_ - which is a JSON text converted back from
+    ///   the json_ data structure. It is the same content as json_string_
+    ///   but has different whitespaces.
+    HttpResponseJsonTest()
+        : json_(), json_string_(), json_string_from_json_() {
+        json_string_ =
+            "["
+            "  {"
+            "    \"pid\": 8080,"
+            "    \"status\": 10,"
+            "    \"comment\": \"Nice comment from 8080\""
+            "  },"
+            "  {"
+            "    \"pid\": 8081,"
+            "    \"status\": 12,"
+            "    \"comment\": \"A comment from 8081\""
+            "  }"
+            "]";
+
+        json_ = Element::fromJSON(json_string_);
+        json_string_from_json_ = json_->str();
+    }
+
+    /// @brief Test that the response format is correct.
+    ///
+    /// @param status_code HTTP status code for which the response should
+    /// be tested.
+    /// @param status_message HTTP status message.
+    void testGenericResponse(const HttpStatusCode& status_code,
+                             const std::string& status_message) {
+        TestHttpResponseJson response(HttpVersion(1, 0), status_code);
+        ASSERT_NO_THROW(response.finalize());
+        std::ostringstream status_message_json;
+        // Build the expected content.
+        status_message_json << "{ \"result\": "
+                            << static_cast<uint16_t>(status_code)
+                            << ", \"text\": "
+                            << "\"" << status_message << "\" }";
+        std::ostringstream response_string;
+        response_string <<
+            "HTTP/1.0 " << static_cast<uint16_t>(status_code) << " "
+            << status_message << "\r\n";
+
+        // The content must only be generated for error codes.
+        if (HttpResponse::isClientError(status_code) ||
+            HttpResponse::isServerError(status_code)) {
+            response_string << "Content-Length: " << status_message_json.str().size()
+                            << "\r\n";
+        } else {
+            response_string << "Content-Length: 0\r\n";
+        }
+
+        // Content-Type and Date are automatically included.
+        response_string << "Content-Type: application/json\r\n"
+            "Date: " << response.getDateHeaderValue() << "\r\n\r\n";
+
+        if (HttpResponse::isClientError(status_code) ||
+            HttpResponse::isServerError(status_code)) {
+            response_string << status_message_json.str();
+        }
+
+        // Check that the output is as expected.
+        EXPECT_EQ(response_string.str(), response.toString());
+    }
+
+    /// @brief JSON content represented as structure of Element objects.
+    ConstElementPtr json_;
+
+    /// @brief Pretty formatted JSON content.
+    std::string json_string_;
+
+    /// @brief JSON content parsed back from json_ structure.
+    std::string json_string_from_json_;
+
+};
+
+// Test that the response with custom JSON content is generated properly.
+TEST_F(HttpResponseJsonTest, responseWithContent) {
+    TestHttpResponseJson response(HttpVersion(1, 1), HttpStatusCode::OK);
+    ASSERT_NO_THROW(response.setBodyAsJson(json_));
+    ASSERT_NO_THROW(response.finalize());
+
+    std::ostringstream response_string;
+    response_string <<
+        "HTTP/1.1 200 OK\r\n"
+        "Content-Length: " << json_string_from_json_.length() << "\r\n"
+        "Content-Type: application/json\r\n"
+        "Date: " << response.getDateHeaderValue() << "\r\n\r\n"
+                    << json_string_from_json_;
+    EXPECT_EQ(response_string.str(), response.toString());
+}
+
+// Test that generic responses are created properly.
+TEST_F(HttpResponseJsonTest, genericResponse) {
+    testGenericResponse(HttpStatusCode::OK, "OK");
+    testGenericResponse(HttpStatusCode::CREATED, "Created");
+    testGenericResponse(HttpStatusCode::ACCEPTED, "Accepted");
+    testGenericResponse(HttpStatusCode::NO_CONTENT, "No Content");
+    testGenericResponse(HttpStatusCode::MULTIPLE_CHOICES,
+                        "Multiple Choices");
+    testGenericResponse(HttpStatusCode::MOVED_PERMANENTLY,
+                        "Moved Permanently");
+    testGenericResponse(HttpStatusCode::MOVED_TEMPORARILY,
+                        "Moved Temporarily");
+    testGenericResponse(HttpStatusCode::NOT_MODIFIED, "Not Modified");
+    testGenericResponse(HttpStatusCode::BAD_REQUEST, "Bad Request");
+    testGenericResponse(HttpStatusCode::UNAUTHORIZED, "Unauthorized");
+    testGenericResponse(HttpStatusCode::FORBIDDEN, "Forbidden");
+    testGenericResponse(HttpStatusCode::NOT_FOUND, "Not Found");
+    testGenericResponse(HttpStatusCode::REQUEST_TIMEOUT, "Request Timeout");
+    testGenericResponse(HttpStatusCode::INTERNAL_SERVER_ERROR,
+                        "Internal Server Error");
+    testGenericResponse(HttpStatusCode::NOT_IMPLEMENTED, "Not Implemented");
+    testGenericResponse(HttpStatusCode::BAD_GATEWAY, "Bad Gateway");
+    testGenericResponse(HttpStatusCode::SERVICE_UNAVAILABLE,
+                        "Service Unavailable");
+}
+
+}
diff --git a/src/lib/http/tests/response_parser_unittests.cc b/src/lib/http/tests/response_parser_unittests.cc
new file mode 100644
index 0000000..58d479d
--- /dev/null
+++ b/src/lib/http/tests/response_parser_unittests.cc
@@ -0,0 +1,351 @@
+// Copyright (C) 2017-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cc/data.h>
+#include <http/response_json.h>
+#include <http/response_parser.h>
+#include <gtest/gtest.h>
+#include <string>
+
+using namespace isc;
+using namespace isc::data;
+using namespace isc::http;
+
+namespace {
+
+/// @brief Test fixture class for @ref HttpResponseParser.
+class HttpResponseParserTest : public ::testing::Test {
+public:
+
+    /// @brief Creates HTTP response string.
+    ///
+    /// @param preamble A string including HTTP response's first line
+    /// and all headers except "Content-Length".
+    /// @param payload A string containing HTTP response payload.
+    std::string createResponseString(const std::string& preamble,
+                                     const std::string& payload) {
+        std::ostringstream s;
+        s << preamble;
+        s << "Content-Length: " << payload.length() << "\r\n\r\n"
+          << payload;
+        return (s.str());
+    }
+
+    /// @brief Parses the HTTP response and checks that parsing was
+    /// successful.
+    ///
+    /// @param http_resp HTTP response string.
+    void doParse(const std::string& http_resp) {
+        HttpResponseParser parser(response_);
+        ASSERT_NO_THROW(parser.initModel());
+
+        parser.postBuffer(&http_resp[0], http_resp.size());
+        ASSERT_NO_THROW(parser.poll());
+
+        ASSERT_FALSE(parser.needData());
+        ASSERT_TRUE(parser.httpParseOk());
+        EXPECT_TRUE(parser.getErrorMessage().empty());
+    }
+
+    /// @brief Tests that parsing fails when malformed HTTP response
+    /// is received.
+    ///
+    /// @param http_resp HTTP response string.
+    void testInvalidHttpResponse(const std::string& http_resp) {
+        HttpResponseParser parser(response_);
+        ASSERT_NO_THROW(parser.initModel());
+
+        parser.postBuffer(&http_resp[0], http_resp.size());
+        ASSERT_NO_THROW(parser.poll());
+
+        EXPECT_FALSE(parser.needData());
+        EXPECT_FALSE(parser.httpParseOk());
+        EXPECT_FALSE(parser.getErrorMessage().empty());
+    }
+
+    /// @brief Tests that the response specified with (header, body) can
+    ///        be parsed properly.
+    ///
+    /// @param header specifies the header of the response to be parsed
+    /// @param json specifies the body of the response (JSON in text format) to be parsed
+    /// @param expect_success whether the parsing is expected to be successful
+    ///
+    /// @return a parser that parsed the response for further inspection
+    HttpResponseJson testResponseWithJson(const std::string& header,
+                                          const std::string& json,
+                                          bool expect_success = true) {
+        std::string http_resp = createResponseString(header, json);
+
+        // Create HTTP response which accepts JSON as a body.
+        HttpResponseJson response;
+
+        // Create a parser and make it use the response we created.
+        HttpResponseParser parser(response);
+        EXPECT_NO_THROW(parser.initModel());
+
+        // Simulate receiving HTTP response in chunks.
+        const unsigned chunk_size = 10;
+        while (!http_resp.empty()) {
+            size_t chunk = http_resp.size() % chunk_size;
+            if (chunk == 0) {
+                chunk = chunk_size;
+            }
+
+            parser.postBuffer(&http_resp[0], chunk);
+            http_resp.erase(0, chunk);
+            parser.poll();
+            if (chunk < chunk_size) {
+                EXPECT_TRUE(parser.needData());
+                if (!parser.needData()) {
+                    ADD_FAILURE() << "Parser completed prematurely";
+                    return (response);
+                }
+            }
+        }
+
+        if (expect_success) {
+            // Parser should have parsed the response and should expect no more data.
+            EXPECT_FALSE(parser.needData());
+            // Parsing should be successful.
+            EXPECT_TRUE(parser.httpParseOk()) << parser.getErrorMessage();
+            // There should be no error message.
+            EXPECT_TRUE(parser.getErrorMessage().empty());
+        }
+
+        return (response);
+    }
+
+    /// @brief Instance of the HttpResponse used by the unit tests.
+    HttpResponse response_;
+};
+
+// Test test verifies that an HTTP response including JSON body is parsed
+// successfully.
+TEST_F(HttpResponseParserTest, responseWithJson) {
+    std::string http_resp = "HTTP/1.1 408 Request Timeout\r\n"
+        "Content-Type: application/json\r\n";
+    std::string json = "{ \"result\": 0, \"text\": \"All ok\" }";
+
+    HttpResponseJson response = testResponseWithJson(http_resp, json);
+
+    // Verify HTTP version, status code and phrase.
+    EXPECT_EQ(1, response.getHttpVersion().major_);
+    EXPECT_EQ(1, response.getHttpVersion().minor_);
+    EXPECT_EQ(HttpStatusCode::REQUEST_TIMEOUT, response.getStatusCode());
+    EXPECT_EQ("Request Timeout", response.getStatusPhrase());
+
+    // Try to retrieve values carried in JSON payload.
+    ConstElementPtr json_element;
+    ASSERT_NO_THROW(json_element = response.getJsonElement("result"));
+    EXPECT_EQ(0, json_element->intValue());
+
+    ASSERT_NO_THROW(json_element = response.getJsonElement("text"));
+    EXPECT_EQ("All ok", json_element->stringValue());
+}
+
+// This test verifies that extraneous data in the response will not cause
+// an error if "Content-Length" value refers to the length of the valid
+// part of the response.
+TEST_F(HttpResponseParserTest, extraneousDataInResponse) {
+    std::string http_resp = "HTTP/1.0 200 OK\r\n"
+        "Content-Type: application/json\r\n";
+    std::string json = "{ \"service\": \"dhcp4\", \"command\": \"shutdown\" }";
+
+    // Create valid response.
+    http_resp = createResponseString(http_resp, json);
+
+    // Add some garbage at the end.
+    http_resp += "some stuff which, if parsed, will cause errors";
+
+    // Create HTTP response which accepts JSON as a body.
+    HttpResponseJson response;
+
+    // Create a parser and make it use the response we created.
+    HttpResponseParser parser(response);
+    ASSERT_NO_THROW(parser.initModel());
+
+    // Feed the parser with the response containing some garbage at the end.
+    parser.postBuffer(&http_resp[0], http_resp.size());
+    ASSERT_NO_THROW(parser.poll());
+
+    // The parser should only parse the valid part of the response as indicated
+    // by the Content-Length.
+    ASSERT_FALSE(parser.needData());
+    ASSERT_TRUE(parser.httpParseOk());
+    // There should be no error message.
+    EXPECT_TRUE(parser.getErrorMessage().empty());
+
+    // Do another poll() to see if the parser will parse the garbage. We
+    // expect that it doesn't.
+    ASSERT_NO_THROW(parser.poll());
+    EXPECT_FALSE(parser.needData());
+    EXPECT_TRUE(parser.httpParseOk());
+    EXPECT_TRUE(parser.getErrorMessage().empty());
+}
+
+// This test verifies that LWS is parsed correctly. The LWS (linear white
+// space) marks line breaks in the HTTP header values.
+TEST_F(HttpResponseParserTest, getLWS) {
+    // "User-Agent" header contains line breaks with whitespaces in the new
+    // lines to mark continuation of the header value.
+    std::string http_resp = "HTTP/1.1 200 OK\r\n"
+        "Content-Type: text/html\r\n"
+        "User-Agent: Kea/1.2 Command \r\n"
+        " Control \r\n"
+        "\tClient\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_resp));
+
+    // Verify parsed values.
+    EXPECT_EQ(1, response_.getHttpVersion().major_);
+    EXPECT_EQ(1, response_.getHttpVersion().minor_);
+    EXPECT_EQ(HttpStatusCode::OK, response_.getStatusCode());
+    EXPECT_EQ("OK", response_.getStatusPhrase());
+    EXPECT_EQ("text/html", response_.getHeaderValue("Content-Type"));
+    EXPECT_EQ("Kea/1.2 Command Control Client",
+              response_.getHeaderValue("User-Agent"));
+}
+
+// This test verifies that the HTTP response with no headers is
+// parsed correctly.
+TEST_F(HttpResponseParserTest, noHeaders) {
+    std::string http_resp = "HTTP/1.1 204 No Content\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_resp));
+
+    // Verify the values.
+    EXPECT_EQ(1, response_.getHttpVersion().major_);
+    EXPECT_EQ(1, response_.getHttpVersion().minor_);
+    EXPECT_EQ(HttpStatusCode::NO_CONTENT, response_.getStatusCode());
+}
+
+// This test verifies that headers are case insensitive.
+TEST_F(HttpResponseParserTest, headersCaseInsensitive) {
+    std::string http_resp = "HTTP/1.1 200 OK\r\n"
+        "Content-type: text/html\r\n"
+        "connection: clOSe\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_resp));
+
+    EXPECT_EQ("text/html", response_.getHeader("Content-Type")->getValue());
+    EXPECT_EQ("close", response_.getHeader("Connection")->getLowerCaseValue());
+    EXPECT_EQ(1, response_.getHttpVersion().major_);
+    EXPECT_EQ(1, response_.getHttpVersion().minor_);
+    EXPECT_EQ(HttpStatusCode::OK, response_.getStatusCode());
+    EXPECT_EQ("OK", response_.getStatusPhrase());
+}
+
+// This test verifies that the header with no whitespace between the
+// colon and header value is accepted.
+TEST_F(HttpResponseParserTest, noHeaderWhitespace) {
+    std::string http_resp = "HTTP/1.0 200 OK\r\n"
+        "Content-Type:text/html\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_resp));
+
+    EXPECT_EQ("text/html", response_.getHeaderValue("Content-Type"));
+    EXPECT_EQ(1, response_.getHttpVersion().major_);
+    EXPECT_EQ(0, response_.getHttpVersion().minor_);
+    EXPECT_EQ(HttpStatusCode::OK, response_.getStatusCode());
+    EXPECT_EQ("OK", response_.getStatusPhrase());
+}
+
+// This test verifies that the header value preceded with multiple
+// whitespaces is accepted.
+TEST_F(HttpResponseParserTest, multipleLeadingHeaderWhitespaces) {
+    std::string http_resp = "HTTP/1.0 200 OK\r\n"
+        "Content-Type:     text/html\r\n\r\n";
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_resp));
+
+    EXPECT_EQ("text/html", response_.getHeaderValue("Content-Type"));
+    EXPECT_EQ(1, response_.getHttpVersion().major_);
+    EXPECT_EQ(0, response_.getHttpVersion().minor_);
+    EXPECT_EQ(HttpStatusCode::OK, response_.getStatusCode());
+    EXPECT_EQ("OK", response_.getStatusPhrase());
+}
+
+// This test verifies that the response containing a typo in the
+// HTTP version string causes parsing error.
+TEST_F(HttpResponseParserTest, invalidHTTPString) {
+    std::string http_resp = "HTLP/2.0 100 OK\r\n"
+        "Content-Type: text/html\r\n\r\n";
+    testInvalidHttpResponse(http_resp);
+}
+
+// This test verifies that error is reported when the HTTP version
+// string doesn't contain a slash character.
+TEST_F(HttpResponseParserTest, invalidHttpVersionNoSlash) {
+    std::string http_resp = "HTTP 1.1 100 OK\r\n"
+        "Content-Type: text/html\r\n\r\n";
+    testInvalidHttpResponse(http_resp);
+}
+
+// This test verifies that error is reported when HTTP version string
+// doesn't contain the minor version number.
+TEST_F(HttpResponseParserTest, invalidHttpNoMinorVersion) {
+    std::string http_resp = "HTTP/1 200 OK\r\n"
+        "Content-Type: text/html\r\n\r\n";
+    testInvalidHttpResponse(http_resp);
+}
+
+// This test verifies that error is reported when HTTP header name
+// contains an invalid character.
+TEST_F(HttpResponseParserTest, invalidHeaderName) {
+    std::string http_resp = "HTTP/1.1 200 OK\r\n"
+        "Content-;: text/html\r\n\r\n";
+    testInvalidHttpResponse(http_resp);
+}
+
+// This test verifies that error is reported when HTTP header value
+// is not preceded with the colon character.
+TEST_F(HttpResponseParserTest, noColonInHttpHeader) {
+    std::string http_resp = "HTTP/1.1 200 OK\r\n"
+        "Content-Type text/html\r\n\r\n";
+    testInvalidHttpResponse(http_resp);
+}
+
+// This test verifies that the HTTP response is formatted for logging.
+TEST_F(HttpResponseParserTest, logFormatHttpMessage) {
+    std::string message = "POST / HTTP/1.1\r\n"
+        "Host: 127.0.0.1:8080\r\n"
+        "User-Agent: curl/7.59.0\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 51\r\n\r\n"
+        "{ \"command\": \"config-get\", \"service\": [ \"dhcp4\" ] }";
+
+    // limit = 0 means no limit
+    EXPECT_EQ(message, HttpResponseParser::logFormatHttpMessage(message, 0));
+
+    // large enough limit should not cause the truncation.
+    EXPECT_EQ(message, HttpResponseParser::logFormatHttpMessage(message, 1024));
+
+    // Only 3 characters requested. The request should be truncated.
+    EXPECT_EQ("POS.........\n(truncating HTTP message larger than 3 characters)\n",
+              HttpResponseParser::logFormatHttpMessage(message, 3));
+}
+
+TEST_F(HttpResponseParserTest, parseEmptyResponse) {
+    std::string http_resp = "HTTP/1.1 200 OK\r\n"
+        "Content-Type: application/json\r\n";
+    std::string json = "";
+
+    http_resp = createResponseString(http_resp, json);
+
+    ASSERT_NO_FATAL_FAILURE(doParse(http_resp));
+
+    HttpResponseJson response = testResponseWithJson(http_resp, json);
+
+    EXPECT_EQ("", response_.getBody());
+    EXPECT_EQ(1, response_.getHttpVersion().major_);
+    EXPECT_EQ(1, response_.getHttpVersion().minor_);
+    EXPECT_EQ(HttpStatusCode::OK, response_.getStatusCode());
+    EXPECT_EQ("OK", response_.getStatusPhrase());
+}
+
+}
diff --git a/src/lib/http/tests/response_test.h b/src/lib/http/tests/response_test.h
new file mode 100644
index 0000000..d342a64
--- /dev/null
+++ b/src/lib/http/tests/response_test.h
@@ -0,0 +1,62 @@
+// Copyright (C) 2016-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef HTTP_RESPONSE_TEST_H
+#define HTTP_RESPONSE_TEST_H
+
+#include <http/http_types.h>
+#include <http/response.h>
+#include <boost/lexical_cast.hpp>
+#include <cstdint>
+
+namespace isc {
+namespace http {
+namespace test {
+
+/// @brief Base class for test HTTP response.
+template<typename HttpResponseType>
+class TestHttpResponseBase : public HttpResponseType {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param version HTTP version for the response.
+    /// @param status_code HTTP status code.
+    TestHttpResponseBase(const HttpVersion& version,
+                         const HttpStatusCode& status_code)
+        : HttpResponseType(version, status_code) {
+    }
+
+    /// @brief Returns fixed header value.
+    ///
+    /// Including fixed header value in the response makes the
+    /// response deterministic, which is critical for the unit
+    /// tests.
+    virtual std::string getDateHeaderValue() const {
+        return ("Tue, 19 Dec 2016 18:53:35 GMT");
+    }
+
+    /// @brief Returns date header value.
+    std::string generateDateHeaderValue() const {
+        return (HttpResponseType::getDateHeaderValue());
+    }
+
+    /// @brief Sets custom content length.
+    ///
+    /// @param content_length Content length value.
+    void setContentLength(const uint64_t content_length) {
+        HttpHeaderPtr length_header(new HttpHeader("Content-Length",
+                                                   boost::lexical_cast<std::string>
+                                                   (content_length)));
+        HttpResponseType::headers_["content-length"] = length_header;
+    }
+};
+
+} // namespace test
+} // namespace http
+} // namespace isc
+
+#endif
diff --git a/src/lib/http/tests/response_unittests.cc b/src/lib/http/tests/response_unittests.cc
new file mode 100644
index 0000000..f54e65d
--- /dev/null
+++ b/src/lib/http/tests/response_unittests.cc
@@ -0,0 +1,169 @@
+// Copyright (C) 2016-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <http/date_time.h>
+#include <http/http_types.h>
+#include <http/response.h>
+#include <http/tests/response_test.h>
+#include <gtest/gtest.h>
+#include <sstream>
+#include <string>
+
+using namespace boost::posix_time;
+using namespace isc::http;
+using namespace isc::http::test;
+
+namespace {
+
+/// @brief Response type used in tests.
+typedef TestHttpResponseBase<HttpResponse> TestHttpResponse;
+
+/// @brief Test fixture class for @ref HttpResponse.
+class HttpResponseTest : public ::testing::Test {
+public:
+
+    /// @brief Checks if the format of the response is correct.
+    ///
+    /// @param status_code HTTP status code in the response.
+    /// @param status_message HTTP status message in the response.
+    void testResponse(const HttpStatusCode& status_code,
+                      const std::string& status_message) {
+        // Create the response. Because we're using derived class
+        // it returns the fixed value of the Date header, which is
+        // very useful in unit tests.
+        TestHttpResponse response(HttpVersion(1, 0), status_code);
+        response.context()->headers_.push_back(HttpHeaderContext("Content-Type", "text/html"));
+        ASSERT_NO_THROW(response.finalize());
+        std::ostringstream response_string;
+        response_string << "HTTP/1.0 " << static_cast<uint16_t>(status_code)
+            << " " << status_message;
+        EXPECT_EQ(response_string.str(), response.toBriefString());
+
+        response_string
+            << "\r\nContent-Length: 0\r\n"
+            << "Content-Type: text/html\r\n"
+            << "Date: " << response.getDateHeaderValue() << "\r\n\r\n";
+        EXPECT_EQ(response_string.str(), response.toString());
+    }
+};
+
+// Test the case of HTTP OK message.
+TEST_F(HttpResponseTest, responseOK) {
+    // Include HTML body.
+    const std::string sample_body =
+        "<html>"
+        "<head><title>Kea page title</title></head>"
+        "<body><h1>Some header</h1></body>"
+        "</html>";
+
+    // Create the message and add some headers.
+    TestHttpResponse response(HttpVersion(1, 0), HttpStatusCode::OK);
+    response.context()->headers_.push_back(HttpHeaderContext("Content-Type", "text/html"));
+    response.context()->headers_.push_back(HttpHeaderContext("Host", "kea.example.org"));
+    response.context()->body_ = sample_body;
+    ASSERT_NO_THROW(response.finalize());
+
+    // Create a string holding expected response. Note that the Date
+    // is a fixed value returned by the customized TestHttpResponse
+    // class.
+    std::ostringstream response_string;
+    response_string <<
+        "HTTP/1.0 200 OK\r\n"
+        "Content-Length: " << sample_body.length() << "\r\n"
+        "Content-Type: text/html\r\n"
+        "Date: " << response.getDateHeaderValue() << "\r\n"
+        "Host: kea.example.org\r\n\r\n" << sample_body;
+
+    EXPECT_EQ(response_string.str(), response.toString());
+}
+
+// Test generic responses for various status codes.
+TEST_F(HttpResponseTest, genericResponse) {
+    testResponse(HttpStatusCode::OK, "OK");
+    testResponse(HttpStatusCode::CREATED, "Created");
+    testResponse(HttpStatusCode::ACCEPTED, "Accepted");
+    testResponse(HttpStatusCode::NO_CONTENT, "No Content");
+    testResponse(HttpStatusCode::MULTIPLE_CHOICES, "Multiple Choices");
+    testResponse(HttpStatusCode::MOVED_PERMANENTLY, "Moved Permanently");
+    testResponse(HttpStatusCode::MOVED_TEMPORARILY, "Moved Temporarily");
+    testResponse(HttpStatusCode::NOT_MODIFIED, "Not Modified");
+    testResponse(HttpStatusCode::BAD_REQUEST, "Bad Request");
+    testResponse(HttpStatusCode::UNAUTHORIZED, "Unauthorized");
+    testResponse(HttpStatusCode::FORBIDDEN, "Forbidden");
+    testResponse(HttpStatusCode::NOT_FOUND, "Not Found");
+    testResponse(HttpStatusCode::REQUEST_TIMEOUT, "Request Timeout");
+    testResponse(HttpStatusCode::INTERNAL_SERVER_ERROR, "Internal Server Error");
+    testResponse(HttpStatusCode::NOT_IMPLEMENTED, "Not Implemented");
+    testResponse(HttpStatusCode::BAD_GATEWAY, "Bad Gateway");
+    testResponse(HttpStatusCode::SERVICE_UNAVAILABLE, "Service Unavailable");
+}
+
+// Test if the class correctly identifies client errors.
+TEST_F(HttpResponseTest, isClientError) {
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::OK));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::CREATED));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::ACCEPTED));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::NO_CONTENT));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::MULTIPLE_CHOICES));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::MOVED_PERMANENTLY));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::MOVED_TEMPORARILY));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::NOT_MODIFIED));
+    EXPECT_TRUE(HttpResponse::isClientError(HttpStatusCode::BAD_REQUEST));
+    EXPECT_TRUE(HttpResponse::isClientError(HttpStatusCode::UNAUTHORIZED));
+    EXPECT_TRUE(HttpResponse::isClientError(HttpStatusCode::FORBIDDEN));
+    EXPECT_TRUE(HttpResponse::isClientError(HttpStatusCode::NOT_FOUND));
+    EXPECT_TRUE(HttpResponse::isClientError(HttpStatusCode::REQUEST_TIMEOUT));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::INTERNAL_SERVER_ERROR));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::NOT_IMPLEMENTED));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::BAD_GATEWAY));
+    EXPECT_FALSE(HttpResponse::isClientError(HttpStatusCode::SERVICE_UNAVAILABLE));
+}
+
+// Test if the class correctly identifies server errors.
+TEST_F(HttpResponseTest, isServerError) {
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::OK));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::CREATED));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::ACCEPTED));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::NO_CONTENT));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::MULTIPLE_CHOICES));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::MOVED_PERMANENTLY));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::MOVED_TEMPORARILY));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::NOT_MODIFIED));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::BAD_REQUEST));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::UNAUTHORIZED));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::FORBIDDEN));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::NOT_FOUND));
+    EXPECT_FALSE(HttpResponse::isServerError(HttpStatusCode::REQUEST_TIMEOUT));
+    EXPECT_TRUE(HttpResponse::isServerError(HttpStatusCode::INTERNAL_SERVER_ERROR));
+    EXPECT_TRUE(HttpResponse::isServerError(HttpStatusCode::NOT_IMPLEMENTED));
+    EXPECT_TRUE(HttpResponse::isServerError(HttpStatusCode::BAD_GATEWAY));
+    EXPECT_TRUE(HttpResponse::isServerError(HttpStatusCode::SERVICE_UNAVAILABLE));
+}
+
+// Test that the generated time value, being included in the Date
+// header, is correct.
+TEST_F(HttpResponseTest, getDateHeaderValue) {
+    // Create a response and retrieve the value to be included in the
+    // Date header. This value should hold a current time in the
+    // RFC1123 format.
+    TestHttpResponse response(HttpVersion(1, 0), HttpStatusCode::OK);
+    std::string generated_date = response.generateDateHeaderValue();
+
+    // Use our date/time utilities to parse this value into the ptime.
+    HttpDateTime parsed_time = HttpDateTime::fromRfc1123(generated_date);
+
+    // Now that we have it converted back, we can check how far this
+    // value is from the current time. To be on the safe side, we check
+    // that it is not later than 10 seconds apart, rather than checking
+    // it for equality. In fact, checking it for equality would almost
+    // certainly cause an error. Especially on a virtual machine.
+    time_duration parsed_to_current =
+        microsec_clock::universal_time() - parsed_time.getPtime();
+    EXPECT_LT(parsed_to_current.seconds(), 10);
+}
+
+}
diff --git a/src/lib/http/tests/run_unittests.cc b/src/lib/http/tests/run_unittests.cc
new file mode 100644
index 0000000..17255dc
--- /dev/null
+++ b/src/lib/http/tests/run_unittests.cc
@@ -0,0 +1,21 @@
+// Copyright (C) 2016-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/logger_support.h>
+#include <http/http_log.h>
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    isc::log::initLogger();
+
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/lib/http/tests/server_client_unittests.cc b/src/lib/http/tests/server_client_unittests.cc
new file mode 100644
index 0000000..4ca280d
--- /dev/null
+++ b/src/lib/http/tests/server_client_unittests.cc
@@ -0,0 +1,2041 @@
+// Copyright (C) 2017-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/interval_timer.h>
+#include <asiolink/tls_acceptor.h>
+#include <cc/data.h>
+#include <test_http_client.h>
+#include <http/client.h>
+#include <http/http_types.h>
+#include <http/listener.h>
+#include <http/listener_impl.h>
+#include <http/post_request_json.h>
+#include <http/response_creator.h>
+#include <http/response_creator_factory.h>
+#include <http/response_json.h>
+#include <http/tests/response_test.h>
+#include <http/url.h>
+#include <util/multi_threading_mgr.h>
+
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/ip/tcp.hpp>
+#include <boost/pointer_cast.hpp>
+#include <gtest/gtest.h>
+
+#include <functional>
+#include <list>
+#include <sstream>
+#include <string>
+
+using namespace boost::asio::ip;
+using namespace isc::asiolink;
+using namespace isc::data;
+using namespace isc::http;
+using namespace isc::http::test;
+using namespace isc::util;
+namespace ph = std::placeholders;
+
+namespace {
+
+/// @brief IP address to which HTTP service is bound.
+const std::string SERVER_ADDRESS = "127.0.0.1";
+
+/// @brief IPv6 address to whch HTTP service is bound.
+const std::string IPV6_SERVER_ADDRESS = "::1";
+
+/// @brief Port number to which HTTP service is bound.
+const unsigned short SERVER_PORT = 18123;
+
+/// @brief Request Timeout used in most of the tests (ms).
+const long REQUEST_TIMEOUT = 10000;
+
+/// @brief Persistent connection idle timeout used in most of the tests (ms).
+const long IDLE_TIMEOUT = 10000;
+
+/// @brief Persistent connection idle timeout used in tests where idle connections
+/// are tested (ms).
+const long SHORT_IDLE_TIMEOUT = 200;
+
+/// @brief Test timeout (ms).
+const long TEST_TIMEOUT = 10000;
+
+/// @brief Test HTTP response.
+typedef TestHttpResponseBase<HttpResponseJson> Response;
+
+/// @brief Pointer to test HTTP response.
+typedef boost::shared_ptr<Response> ResponsePtr;
+
+/// @brief Generic test HTTP response.
+typedef TestHttpResponseBase<HttpResponse> GenericResponse;
+
+/// @brief Pointer to generic test HTTP response.
+typedef boost::shared_ptr<GenericResponse> GenericResponsePtr;
+
+/// @brief Implementation of the @ref HttpResponseCreator.
+class TestHttpResponseCreator : public HttpResponseCreator {
+public:
+
+    /// @brief Create a new request.
+    ///
+    /// @return Pointer to the new instance of the @ref HttpRequest.
+    virtual HttpRequestPtr
+    createNewHttpRequest() const {
+        return (HttpRequestPtr(new PostHttpRequestJson()));
+    }
+
+private:
+
+    /// @brief Creates HTTP response.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP response.
+    virtual HttpResponsePtr
+    createStockHttpResponse(const HttpRequestPtr& request,
+                            const HttpStatusCode& status_code) const {
+        // The request hasn't been finalized so the request object
+        // doesn't contain any information about the HTTP version number
+        // used. But, the context should have this data (assuming the
+        // HTTP version is parsed ok).
+        HttpVersion http_version(request->context()->http_version_major_,
+                                 request->context()->http_version_minor_);
+        // This will generate the response holding JSON content.
+        ResponsePtr response(new Response(http_version, status_code));
+        response->finalize();
+        return (response);
+    }
+
+    /// @brief Creates HTTP response.
+    ///
+    /// This method generates 3 types of responses:
+    /// - response with a requested content type,
+    /// - partial response with incomplete JSON body,
+    /// - response with JSON body copied from the request.
+    ///
+    /// The first one is useful to test situations when received response can't
+    /// be parsed because of the content type mismatch. The second one is useful
+    /// to test request timeouts. The third type is used by most of the unit tests
+    /// to test successful transactions.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP OK response with no content.
+    virtual HttpResponsePtr
+    createDynamicHttpResponse(HttpRequestPtr request) {
+        // Request must always be JSON.
+        PostHttpRequestJsonPtr request_json =
+            boost::dynamic_pointer_cast<PostHttpRequestJson>(request);
+        ConstElementPtr body;
+        if (request_json) {
+            body = request_json->getBodyAsJson();
+            if (body) {
+                // Check if the client requested one of the two first response
+                // types.
+                GenericResponsePtr response;
+                ConstElementPtr content_type = body->get("requested-content-type");
+                ConstElementPtr partial_response = body->get("partial-response");
+                if (content_type || partial_response) {
+                    // The first two response types can only be generated using the
+                    // generic response as we have to explicitly modify some of the
+                    // values.
+                    response.reset(new GenericResponse(request->getHttpVersion(),
+                                                       HttpStatusCode::OK));
+                    HttpResponseContextPtr ctx = response->context();
+
+                    if (content_type) {
+                        // Provide requested content type.
+                        ctx->headers_.push_back(HttpHeaderContext("Content-Type",
+                                                                  content_type->stringValue()));
+                        // It doesn't matter what body is there.
+                        ctx->body_ = "abcd";
+                        response->finalize();
+
+                    } else {
+                        // Generate JSON response.
+                        ctx->headers_.push_back(HttpHeaderContext("Content-Type",
+                                                                  "application/json"));
+                        // The body lacks '}' so the client will be waiting for it and
+                        // eventually should time out.
+                        ctx->body_ = "{";
+                        response->finalize();
+                        // The auto generated Content-Length header would be based on the
+                        // body size (so set to 1 byte). We have to override it to
+                        // account for the missing '}' character.
+                        response->setContentLength(2);
+                    }
+                    return (response);
+                }
+            }
+        }
+
+        // Third type of response is requested.
+        ResponsePtr response(new Response(request->getHttpVersion(),
+                                          HttpStatusCode::OK));
+        // If body was included in the request. Let's copy it.
+        if (body) {
+            response->setBodyAsJson(body);
+        }
+
+        response->finalize();
+        return (response);
+    }
+};
+
+/// @brief Implementation of the test @ref HttpResponseCreatorFactory.
+///
+/// This factory class creates @ref TestHttpResponseCreator instances.
+class TestHttpResponseCreatorFactory : public HttpResponseCreatorFactory {
+public:
+
+    /// @brief Creates @ref TestHttpResponseCreator instance.
+    virtual HttpResponseCreatorPtr create() const {
+        HttpResponseCreatorPtr response_creator(new TestHttpResponseCreator());
+        return (response_creator);
+    }
+};
+
+/// @brief Implementation of the HTTP listener used in tests.
+///
+/// This implementation replaces the @c HttpConnection type with a custom
+/// implementation.
+///
+/// @tparam HttpConnectionType Type of the connection object to be used by
+/// the listener implementation.
+template<typename HttpConnectionType>
+class HttpListenerImplCustom : public HttpListenerImpl {
+public:
+
+    HttpListenerImplCustom(IOService& io_service,
+                           const IOAddress& server_address,
+                           const unsigned short server_port,
+                           const TlsContextPtr& tls_context,
+                           const HttpResponseCreatorFactoryPtr& creator_factory,
+                           const long request_timeout,
+                           const long idle_timeout)
+        : HttpListenerImpl(io_service, server_address, server_port,
+                           tls_context, creator_factory, request_timeout,
+                           idle_timeout) {
+    }
+
+protected:
+
+    /// @brief Creates an instance of the @c HttpConnection.
+    ///
+    /// This method is virtual so as it can be overridden when customized
+    /// connections are to be used, e.g. in case of unit testing.
+    ///
+    /// @param response_creator Pointer to the response creator object used to
+    /// create HTTP response from the HTTP request received.
+    /// @param callback Callback invoked when new connection is accepted.
+    ///
+    /// @return Pointer to the created connection.
+    virtual HttpConnectionPtr createConnection(const HttpResponseCreatorPtr& response_creator,
+                                               const HttpAcceptorCallback& callback) {
+        HttpConnectionPtr
+            conn(new HttpConnectionType(io_service_, acceptor_,
+                                        tls_context_, connections_,
+                                        response_creator, callback,
+                                        request_timeout_, idle_timeout_));
+        return (conn);
+    }
+};
+
+/// @brief Derivation of the @c HttpListener used in tests.
+///
+/// This class replaces the default implementation instance with the
+/// @c HttpListenerImplCustom using the customized connection type.
+///
+/// @tparam HttpConnectionType Type of the connection object to be used by
+/// the listener implementation.
+template<typename HttpConnectionType>
+class HttpListenerCustom : public HttpListener {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param io_service IO service to be used by the listener.
+    /// @param server_address Address on which the HTTP service should run.
+    /// @param server_port Port number on which the HTTP service should run.
+    /// @param tls_context TLS context.
+    /// @param creator_factory Pointer to the caller-defined
+    /// @ref HttpResponseCreatorFactory derivation which should be used to
+    /// create @ref HttpResponseCreator instances.
+    /// @param request_timeout Timeout after which the HTTP Request Timeout
+    /// is generated.
+    /// @param idle_timeout Timeout after which an idle persistent HTTP
+    /// connection is closed by the server.
+    ///
+    /// @throw HttpListenerError when any of the specified parameters is
+    /// invalid.
+    HttpListenerCustom(IOService& io_service,
+                       const IOAddress& server_address,
+                       const unsigned short server_port,
+                       const TlsContextPtr& tls_context,
+                       const HttpResponseCreatorFactoryPtr& creator_factory,
+                       const HttpListener::RequestTimeout& request_timeout,
+                       const HttpListener::IdleTimeout& idle_timeout)
+        : HttpListener(io_service, server_address, server_port,
+                       tls_context, creator_factory,
+                       request_timeout, idle_timeout) {
+        // Replace the default implementation with the customized version
+        // using the custom derivation of the HttpConnection.
+        impl_.reset(new HttpListenerImplCustom<HttpConnectionType>
+                    (io_service, server_address, server_port,
+                     tls_context, creator_factory, request_timeout.value_,
+                     idle_timeout.value_));
+    }
+};
+
+/// @brief Implementation of the @c HttpConnection which injects greater
+/// length value than the buffer size into the write socket callback.
+class HttpConnectionLongWriteBuffer : public HttpConnection {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param io_service IO service to be used by the connection.
+    /// @param acceptor Pointer to the TCP acceptor object used to listen for
+    /// new HTTP connections.
+    /// @param tls_context TLS context.
+    /// @param connection_pool Connection pool in which this connection is
+    /// stored.
+    /// @param response_creator Pointer to the response creator object used to
+    /// create HTTP response from the HTTP request received.
+    /// @param callback Callback invoked when new connection is accepted.
+    /// @param request_timeout Configured timeout for a HTTP request.
+    /// @param idle_timeout Timeout after which persistent HTTP connection is
+    /// closed by the server.
+    HttpConnectionLongWriteBuffer(IOService& io_service,
+                                  const HttpAcceptorPtr& acceptor,
+                                  const TlsContextPtr& tls_context,
+                                  HttpConnectionPool& connection_pool,
+                                  const HttpResponseCreatorPtr& response_creator,
+                                  const HttpAcceptorCallback& callback,
+                                  const long request_timeout,
+                                  const long idle_timeout)
+        : HttpConnection(io_service, acceptor, tls_context, connection_pool,
+                         response_creator, callback, request_timeout,
+                         idle_timeout) {
+    }
+
+    /// @brief Callback invoked when data is sent over the socket.
+    ///
+    /// @param transaction Pointer to the transaction for which the callback
+    /// is invoked.
+    /// @param ec Error code.
+    /// @param length Length of the data sent.
+    virtual void socketWriteCallback(HttpConnection::TransactionPtr transaction,
+                                     boost::system::error_code ec,
+                                     size_t length) {
+        // Pass greater length of the data written. The callback should deal
+        // with this and adjust the data length.
+        HttpConnection::socketWriteCallback(transaction, ec, length + 1);
+    }
+};
+
+/// @brief Implementation of the @c HttpConnection which replaces
+/// transaction instance prior to calling write socket callback.
+class HttpConnectionTransactionChange : public HttpConnection {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param io_service IO service to be used by the connection.
+    /// @param acceptor Pointer to the TCP acceptor object used to listen for
+    /// new HTTP connections.
+    /// @param context TLS tls_context.
+    /// @param connection_pool Connection pool in which this connection is
+    /// stored.
+    /// @param response_creator Pointer to the response creator object used to
+    /// create HTTP response from the HTTP request received.
+    /// @param callback Callback invoked when new connection is accepted.
+    /// @param request_timeout Configured timeout for a HTTP request.
+    /// @param idle_timeout Timeout after which persistent HTTP connection is
+    /// closed by the server.
+    HttpConnectionTransactionChange(IOService& io_service,
+                                    const HttpAcceptorPtr& acceptor,
+                                    const TlsContextPtr& tls_context,
+                                    HttpConnectionPool& connection_pool,
+                                    const HttpResponseCreatorPtr& response_creator,
+                                    const HttpAcceptorCallback& callback,
+                                    const long request_timeout,
+                                    const long idle_timeout)
+        : HttpConnection(io_service, acceptor, tls_context, connection_pool,
+                         response_creator, callback, request_timeout,
+                         idle_timeout) {
+    }
+
+    /// @brief Callback invoked when data is sent over the socket.
+    ///
+    /// @param transaction Pointer to the transaction for which the callback
+    /// is invoked.
+    /// @param ec Error code.
+    /// @param length Length of the data sent.
+    virtual void socketWriteCallback(HttpConnection::TransactionPtr transaction,
+                                     boost::system::error_code ec,
+                                     size_t length) {
+        // Replace the transaction. The socket callback should deal with this
+        // gracefully. It should detect that the output buffer is empty. Then
+        // try to see if the connection is persistent. This check should fail,
+        // because the request hasn't been created/finalized. The exception
+        // thrown upon checking the persistence should be caught and the
+        // connection closed.
+        transaction = HttpConnection::Transaction::create(response_creator_);
+        HttpConnection::socketWriteCallback(transaction, ec, length);
+    }
+};
+
+/// @brief Pointer to the TestHttpClient.
+typedef boost::shared_ptr<TestHttpClient> TestHttpClientPtr;
+
+/// @brief Test fixture class for @ref HttpListener.
+class HttpListenerTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// Starts test timer which detects timeouts.
+    HttpListenerTest()
+        : io_service_(), factory_(new TestHttpResponseCreatorFactory()),
+          test_timer_(io_service_), run_io_service_timer_(io_service_), clients_() {
+        test_timer_.setup(std::bind(&HttpListenerTest::timeoutHandler, this, true),
+                          TEST_TIMEOUT, IntervalTimer::ONE_SHOT);
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Removes active HTTP clients.
+    virtual ~HttpListenerTest() {
+        for (auto client = clients_.begin(); client != clients_.end();
+             ++client) {
+            (*client)->close();
+        }
+    }
+
+    /// @brief Connect to the endpoint.
+    ///
+    /// This method creates TestHttpClient instance and retains it in the clients_
+    /// list.
+    ///
+    /// @param request String containing the HTTP request to be sent.
+    void startRequest(const std::string& request) {
+        TestHttpClientPtr client(new TestHttpClient(io_service_));
+        clients_.push_back(client);
+        clients_.back()->startRequest(request);
+    }
+
+    /// @brief Callback function invoke upon test timeout.
+    ///
+    /// It stops the IO service and reports test timeout.
+    ///
+    /// @param fail_on_timeout Specifies if test failure should be reported.
+    void timeoutHandler(const bool fail_on_timeout) {
+        if (fail_on_timeout) {
+            ADD_FAILURE() << "Timeout occurred while running the test!";
+        }
+        io_service_.stop();
+    }
+
+    /// @brief Runs IO service with optional timeout.
+    ///
+    /// @param timeout Optional value specifying for how long the io service
+    /// should be ran.
+    void runIOService(long timeout = 0) {
+        io_service_.get_io_service().reset();
+
+        if (timeout > 0) {
+            run_io_service_timer_.setup(std::bind(&HttpListenerTest::timeoutHandler,
+                                                  this, false),
+                                        timeout, IntervalTimer::ONE_SHOT);
+        }
+        io_service_.run();
+        io_service_.get_io_service().reset();
+        io_service_.poll();
+    }
+
+    /// @brief Returns HTTP OK response expected by unit tests.
+    ///
+    /// @param http_version HTTP version.
+    ///
+    /// @return HTTP OK response expected by unit tests.
+    std::string httpOk(const HttpVersion& http_version) {
+        std::ostringstream s;
+        s << "HTTP/" << http_version.major_ << "." << http_version.minor_ << " 200 OK\r\n"
+            "Content-Length: 33\r\n"
+            "Content-Type: application/json\r\n"
+            "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+            "\r\n"
+            "{ \"remote-address\": \"127.0.0.1\" }";
+        return (s.str());
+    }
+
+    /// @brief Tests that HTTP request timeout status is returned when the
+    /// server does not receive the entire request.
+    ///
+    /// @param request Partial request for which the parser will be waiting for
+    /// the next chunks of data.
+    /// @param expected_version HTTP version expected in the response.
+    void testRequestTimeout(const std::string& request,
+                            const HttpVersion& expected_version) {
+        // Open the listener with the Request Timeout of 1 sec and post the
+        // partial request.
+        HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS),
+                              SERVER_PORT, TlsContextPtr(),
+                              factory_, HttpListener::RequestTimeout(1000),
+                              HttpListener::IdleTimeout(IDLE_TIMEOUT));
+        ASSERT_NO_THROW(listener.start());
+        ASSERT_NO_THROW(startRequest(request));
+        ASSERT_NO_THROW(runIOService());
+        ASSERT_EQ(1, clients_.size());
+        TestHttpClientPtr client = *clients_.begin();
+        ASSERT_TRUE(client);
+
+        // Build the reference response.
+        std::ostringstream expected_response;
+        expected_response
+            << "HTTP/" << expected_version.major_ << "." << expected_version.minor_
+            << " 408 Request Timeout\r\n"
+            "Content-Length: 44\r\n"
+            "Content-Type: application/json\r\n"
+            "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+            "\r\n"
+            "{ \"result\": 408, \"text\": \"Request Timeout\" }";
+
+        // The server should wait for the missing part of the request for 1 second.
+        // The missing part never arrives so the server should respond with the
+        // HTTP Request Timeout status.
+        EXPECT_EQ(expected_response.str(), client->getResponse());
+    }
+
+    /// @brief Tests various cases when unexpected data is passed to the
+    /// socket write handler.
+    ///
+    /// This test uses the custom listener and the test specific derivations of
+    /// the @c HttpConnection class to enforce injection of the unexpected
+    /// data to the socket write callback. The two example applications of
+    /// this test are:
+    /// - injecting greater length value than the output buffer size,
+    /// - replacing the transaction with another transaction.
+    ///
+    /// It is expected that the socket write callback deals gracefully with
+    /// those situations.
+    ///
+    /// @tparam HttpConnectionType Test specific derivation of the
+    /// @c HttpConnection class.
+    template<typename HttpConnectionType>
+    void testWriteBufferIssues() {
+        // The HTTP/1.1 requests are by default persistent.
+        std::string request = "POST /foo/bar HTTP/1.1\r\n"
+            "Content-Type: application/json\r\n"
+            "Content-Length: 3\r\n\r\n"
+            "{ }";
+
+        // Use custom listener and the specialized connection object.
+        HttpListenerCustom<HttpConnectionType>
+            listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                     TlsContextPtr(), factory_,
+                     HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                     HttpListener::IdleTimeout(IDLE_TIMEOUT));
+
+        ASSERT_NO_THROW(listener.start());
+
+        // Send the request.
+        ASSERT_NO_THROW(startRequest(request));
+
+        // Injecting unexpected data should not result in an exception.
+        ASSERT_NO_THROW(runIOService());
+
+        ASSERT_EQ(1, clients_.size());
+        TestHttpClientPtr client = *clients_.begin();
+        ASSERT_TRUE(client);
+        EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+    }
+
+    /// @brief IO service used in the tests.
+    IOService io_service_;
+
+    /// @brief Pointer to the response creator factory.
+    HttpResponseCreatorFactoryPtr factory_;
+
+    /// @brief Asynchronous timer service to detect timeouts.
+    IntervalTimer test_timer_;
+
+    /// @brief Asynchronous timer for running IO service for a specified amount
+    /// of time.
+    IntervalTimer run_io_service_timer_;
+
+    /// @brief List of client connections.
+    std::list<TestHttpClientPtr> clients_;
+};
+
+// This test verifies that HTTP connection can be established and used to
+// transmit HTTP request and receive a response.
+TEST_F(HttpListenerTest, listen) {
+    const std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          TlsContextPtr(), factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+    ASSERT_NO_THROW(listener.start());
+    ASSERT_EQ(SERVER_ADDRESS, listener.getLocalAddress().toText());
+    ASSERT_EQ(SERVER_PORT, listener.getLocalPort());
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+
+// This test verifies that persistent HTTP connection can be established when
+// "Connection: Keep-Alive" header value is specified.
+TEST_F(HttpListenerTest, keepAlive) {
+
+    // The first request contains the keep-alive header which instructs the server
+    // to maintain the TCP connection after sending a response.
+    std::string request = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n"
+        "Connection: Keep-Alive\r\n\r\n"
+        "{ }";
+
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          TlsContextPtr(), factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+
+    ASSERT_NO_THROW(listener.start());
+
+    // Send the request with the keep-alive header.
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_10()), client->getResponse());
+
+    // We have sent keep-alive header so we expect that the connection with
+    // the server remains active.
+    ASSERT_TRUE(client->isConnectionAlive());
+
+    // Test that we can send another request via the same connection. This time
+    // it lacks the keep-alive header, so the server should close the connection
+    // after sending the response.
+    request = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    // Send request reusing the existing connection.
+    ASSERT_NO_THROW(client->sendRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_10()), client->getResponse());
+
+    // Connection should have been closed by the server.
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+// This test verifies that persistent HTTP connection is established by default
+// when HTTP/1.1 is in use.
+TEST_F(HttpListenerTest, persistentConnection) {
+
+    // The HTTP/1.1 requests are by default persistent.
+    std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          TlsContextPtr(), factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+
+    ASSERT_NO_THROW(listener.start());
+
+    // Send the first request.
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    // HTTP/1.1 connection is persistent by default.
+    ASSERT_TRUE(client->isConnectionAlive());
+
+    // Test that we can send another request via the same connection. This time
+    // it includes the "Connection: close" header which instructs the server to
+    // close the connection after responding.
+    request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n"
+        "Connection: close\r\n\r\n"
+        "{ }";
+
+    // Send request reusing the existing connection.
+    ASSERT_NO_THROW(client->sendRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    // Connection should have been closed by the server.
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+// This test verifies that "keep-alive" connection is closed by the server after
+// an idle time.
+TEST_F(HttpListenerTest, keepAliveTimeout) {
+
+    // The first request contains the keep-alive header which instructs the server
+    // to maintain the TCP connection after sending a response.
+    std::string request = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n"
+        "Connection: Keep-Alive\r\n\r\n"
+        "{ }";
+
+    // Specify the idle timeout of 500ms.
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          TlsContextPtr(), factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(500));
+
+    ASSERT_NO_THROW(listener.start());
+
+    // Send the request with the keep-alive header.
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_10()), client->getResponse());
+
+    // We have sent keep-alive header so we expect that the connection with
+    // the server remains active.
+    ASSERT_TRUE(client->isConnectionAlive());
+
+    // Run IO service for 1000ms. The idle time is set to 500ms, so the connection
+    // should be closed by the server while we wait here.
+    runIOService(1000);
+
+    // Make sure the connection has been closed.
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    // Check if we can re-establish the connection and send another request.
+    clients_.clear();
+    request = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_10()), client->getResponse());
+
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+// This test verifies that persistent connection is closed by the server after
+// an idle time.
+TEST_F(HttpListenerTest, persistentConnectionTimeout) {
+
+    // The HTTP/1.1 requests are by default persistent.
+    std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    // Specify the idle timeout of 500ms.
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          TlsContextPtr(), factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(500));
+
+    ASSERT_NO_THROW(listener.start());
+
+    // Send the request.
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    // The connection should remain active.
+    ASSERT_TRUE(client->isConnectionAlive());
+
+    // Run IO service for 1000ms. The idle time is set to 500ms, so the connection
+    // should be closed by the server while we wait here.
+    runIOService(1000);
+
+    // Make sure the connection has been closed.
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    // Check if we can re-establish the connection and send another request.
+    clients_.clear();
+    request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n"
+        "Connection: close\r\n\r\n"
+        "{ }";
+
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+// This test verifies that HTTP/1.1 connection remains open even if there is an
+// error in the message body.
+TEST_F(HttpListenerTest, persistentConnectionBadBody) {
+
+    // The HTTP/1.1 requests are by default persistent.
+    std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 12\r\n\r\n"
+        "{ \"a\": abc }";
+
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          TlsContextPtr(), factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+
+    ASSERT_NO_THROW(listener.start());
+
+    // Send the request.
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ("HTTP/1.1 400 Bad Request\r\n"
+              "Content-Length: 40\r\n"
+              "Content-Type: application/json\r\n"
+              "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+              "\r\n"
+              "{ \"result\": 400, \"text\": \"Bad Request\" }",
+              client->getResponse());
+
+    // The connection should remain active.
+    ASSERT_TRUE(client->isConnectionAlive());
+
+    // Make sure that we can send another request. This time we specify the
+    // "close" connection-token to force the connection to close.
+    request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n"
+        "Connection: close\r\n\r\n"
+        "{ }";
+
+    // Send request reusing the existing connection.
+    ASSERT_NO_THROW(client->sendRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+// This test verifies that the HTTP listener can't be started twice.
+TEST_F(HttpListenerTest, startTwice) {
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          TlsContextPtr(), factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+    ASSERT_NO_THROW(listener.start());
+    EXPECT_THROW(listener.start(), HttpListenerError);
+}
+
+// This test verifies that Bad Request status is returned when the request
+// is malformed.
+TEST_F(HttpListenerTest, badRequest) {
+    // Content-Type is wrong. This should result in Bad Request status.
+    const std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: foo\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          TlsContextPtr(), factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+    ASSERT_NO_THROW(listener.start());
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ("HTTP/1.1 400 Bad Request\r\n"
+              "Content-Length: 40\r\n"
+              "Content-Type: application/json\r\n"
+              "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+              "\r\n"
+              "{ \"result\": 400, \"text\": \"Bad Request\" }",
+              client->getResponse());
+}
+
+// This test verifies that NULL pointer can't be specified for the
+// HttpResponseCreatorFactory.
+TEST_F(HttpListenerTest, invalidFactory) {
+    EXPECT_THROW(HttpListener(io_service_, IOAddress(SERVER_ADDRESS),
+                              SERVER_PORT, TlsContextPtr(),
+                              HttpResponseCreatorFactoryPtr(),
+                              HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                              HttpListener::IdleTimeout(IDLE_TIMEOUT)),
+                 HttpListenerError);
+}
+
+// This test verifies that the timeout of 0 can't be specified for the
+// Request Timeout.
+TEST_F(HttpListenerTest, invalidRequestTimeout) {
+    EXPECT_THROW(HttpListener(io_service_, IOAddress(SERVER_ADDRESS),
+                              SERVER_PORT, TlsContextPtr(), factory_,
+                              HttpListener::RequestTimeout(0),
+                              HttpListener::IdleTimeout(IDLE_TIMEOUT)),
+                 HttpListenerError);
+}
+
+// This test verifies that the timeout of 0 can't be specified for the
+// idle persistent connection timeout.
+TEST_F(HttpListenerTest, invalidIdleTimeout) {
+    EXPECT_THROW(HttpListener(io_service_, IOAddress(SERVER_ADDRESS),
+                              SERVER_PORT, TlsContextPtr(), factory_,
+                              HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                              HttpListener::IdleTimeout(0)),
+                 HttpListenerError);
+}
+
+// This test verifies that listener can't be bound to the port to which
+// other server is bound.
+TEST_F(HttpListenerTest, addressInUse) {
+    tcp::acceptor acceptor(io_service_.get_io_service());
+    // Use other port than SERVER_PORT to make sure that this TCP connection
+    // doesn't affect subsequent tests.
+    tcp::endpoint endpoint(address::from_string(SERVER_ADDRESS),
+                           SERVER_PORT + 1);
+    acceptor.open(endpoint.protocol());
+    acceptor.bind(endpoint);
+
+    // Listener should report an error when we try to start it because another
+    // acceptor is bound to that port and address.
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS),
+                          SERVER_PORT + 1, TlsContextPtr(), factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+    EXPECT_THROW(listener.start(), HttpListenerError);
+}
+
+// This test verifies that HTTP Request Timeout status is returned as
+// expected when the read part of the request contains the HTTP
+// version number. The timeout response should contain the same
+// HTTP version number as the partial request.
+TEST_F(HttpListenerTest, requestTimeoutHttpVersionFound) {
+    // The part of the request specified here is correct but it is not
+    // a complete request.
+    const std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length:";
+
+    testRequestTimeout(request, HttpVersion::HTTP_11());
+}
+
+// This test verifies that HTTP Request Timeout status is returned as
+// expected when the read part of the request does not contain
+// the HTTP version number. The timeout response should by default
+// contain HTTP/1.0 version number.
+TEST_F(HttpListenerTest, requestTimeoutHttpVersionNotFound) {
+    // The part of the request specified here is correct but it is not
+    // a complete request.
+    const std::string request = "POST /foo/bar HTTP";
+
+    testRequestTimeout(request, HttpVersion::HTTP_10());
+}
+
+// This test verifies that injecting length value greater than the
+// output buffer length to the socket write callback does not cause
+// an exception.
+TEST_F(HttpListenerTest, tooLongWriteBuffer) {
+    testWriteBufferIssues<HttpConnectionLongWriteBuffer>();
+}
+
+// This test verifies that changing the transaction before calling
+// the socket write callback does not cause an exception.
+TEST_F(HttpListenerTest, transactionChangeDuringWrite) {
+    testWriteBufferIssues<HttpConnectionTransactionChange>();
+}
+
+/// @brief Test fixture class for testing HTTP client.
+class HttpClientTest : public HttpListenerTest {
+public:
+
+    /// @brief Constructor.
+    HttpClientTest()
+        : HttpListenerTest(),
+          listener_(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                    TlsContextPtr(), factory_,
+                    HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                    HttpListener::IdleTimeout(IDLE_TIMEOUT)),
+          listener2_(io_service_, IOAddress(IPV6_SERVER_ADDRESS), SERVER_PORT + 1,
+                     TlsContextPtr(), factory_,
+                     HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                     HttpListener::IdleTimeout(IDLE_TIMEOUT)),
+          listener3_(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT + 2,
+                     TlsContextPtr(), factory_,
+                     HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                     HttpListener::IdleTimeout(SHORT_IDLE_TIMEOUT)) {
+        MultiThreadingMgr::instance().setMode(false);
+    }
+
+    /// @brief Destructor.
+    ~HttpClientTest() {
+        listener_.stop();
+        listener2_.stop();
+        listener3_.stop();
+        io_service_.poll();
+        MultiThreadingMgr::instance().setMode(false);
+    }
+
+    /// @brief Creates HTTP request with JSON body.
+    ///
+    /// It includes a JSON parameter with a specified value.
+    ///
+    /// @param parameter_name JSON parameter to be included.
+    /// @param value JSON parameter value.
+    /// @param version HTTP version to be used. Default is HTTP/1.1.
+    template<typename ValueType>
+    PostHttpRequestJsonPtr createRequest(const std::string& parameter_name,
+                                         const ValueType& value,
+                                         const HttpVersion& version = HttpVersion(1, 1)) {
+        // Create POST request with JSON body.
+        PostHttpRequestJsonPtr request(new PostHttpRequestJson(HttpRequest::Method::HTTP_POST,
+                                                               "/", version));
+        // Body is a map with a specified parameter included.
+        ElementPtr body = Element::createMap();
+        body->set(parameter_name, Element::create(value));
+        request->setBodyAsJson(body);
+        try {
+            request->finalize();
+
+        } catch (const std::exception& ex) {
+            ADD_FAILURE() << "failed to create request: " << ex.what();
+        }
+
+        return (request);
+    }
+
+    /// @brief Test that two consecutive requests can be sent over the same
+    /// connection (if persistent, if not persistent two connections will
+    /// be used).
+    ///
+    /// @param version HTTP version to be used.
+    void testConsecutiveRequests(const HttpVersion& version) {
+        // Start the server.
+        ASSERT_NO_THROW(listener_.start());
+
+        // Create a client and specify the URL on which the server can be reached.
+        HttpClient client(io_service_);
+        Url url("http://127.0.0.1:18123");
+
+        // Initiate request to the server.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1, version);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        unsigned resp_num = 0;
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request1, response1,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            EXPECT_FALSE(ec);
+        }));
+
+        // Initiate another request to the destination.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2, version);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request2, response2,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            EXPECT_FALSE(ec);
+        }));
+
+        // Actually trigger the requests. The requests should be handlded by the
+        // server one after another. While the first request is being processed
+        // the server should queue another one.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure that the received responses are different. We check that by
+        // comparing value of the sequence parameters.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+
+        EXPECT_NE(sequence1->intValue(), sequence2->intValue());
+    }
+
+    /// @brief Test that the client can communicate with two different
+    /// destinations simultaneously.
+    void testMultipleDestinations() {
+        // Start two servers running on different ports.
+        ASSERT_NO_THROW(listener_.start());
+        ASSERT_NO_THROW(listener2_.start());
+
+        // Create the client. It will be communicating with the two servers.
+        HttpClient client(io_service_);
+
+        // Specify the URLs on which the servers are available.
+        Url url1("http://127.0.0.1:18123");
+        Url url2("http://[::1]:18124");
+
+        // Create a request to the first server.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        unsigned resp_num = 0;
+        ASSERT_NO_THROW(client.asyncSendRequest(url1, TlsContextPtr(),
+                                                request1, response1,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            EXPECT_FALSE(ec);
+        }));
+
+        // Create a request to the second server.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url2, TlsContextPtr(),
+                                                request2, response2,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            EXPECT_FALSE(ec);
+        }));
+
+        // Actually trigger the requests.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure we have received two different responses.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+
+        EXPECT_NE(sequence1->intValue(), sequence2->intValue());
+    }
+
+    /// @brief Test that the client can communicate with the same destination
+    /// address and port but with different TLS contexts so
+    void testMultipleTlsContexts() {
+        // Start only one server.
+        ASSERT_NO_THROW(listener_.start());
+
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL on which the server is available.
+        Url url("http://127.0.0.1:18123");
+
+        // Create a request to the first server.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        unsigned resp_num = 0;
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request1, response1,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Create a request with the second TLS context.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request2, response2,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Actually trigger the requests.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure we have received two different responses.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+
+        EXPECT_NE(sequence1->intValue(), sequence2->intValue());
+    }
+
+    /// @brief Test that idle connection can be resumed for second request.
+    void testIdleConnection() {
+        // Start the server that has short idle timeout. It closes the idle
+        // connection after 200ms.
+        ASSERT_NO_THROW(listener3_.start());
+
+        // Create the client that will communicate with this server.
+        HttpClient client(io_service_);
+
+        // Specify the URL of this server.
+        Url url("http://127.0.0.1:18125");
+
+        // Create the first request.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request1, response1,
+            [this](const boost::system::error_code& ec, const HttpResponsePtr&,
+                   const std::string&) {
+            io_service_.stop();
+            EXPECT_FALSE(ec);
+        }));
+
+        // Run the IO service until the response is received.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure the response has been received.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+
+        // Delay the generation of the second request by 2x server idle timeout.
+        // This should be enough to cause the server to close the connection.
+        ASSERT_NO_THROW(runIOService(SHORT_IDLE_TIMEOUT * 2));
+
+        // Create another request.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request2, response2,
+            [this](const boost::system::error_code& ec, const HttpResponsePtr&,
+                   const std::string&) {
+            io_service_.stop();
+            EXPECT_FALSE(ec);
+        }));
+
+        // Actually trigger the second request.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sire that the server has responded.
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+
+        // Make sure that two different responses have been received.
+        EXPECT_NE(sequence1->intValue(), sequence2->intValue());
+    }
+
+    /// @brief This test verifies that the client returns IO error code when the
+    /// server is unreachable.
+    void testUnreachable () {
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL of the server. This server is down.
+        Url url("http://127.0.0.1:18123");
+
+        // Create the request.
+        PostHttpRequestJsonPtr request = createRequest("sequence", 1);
+        HttpResponseJsonPtr response(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request, response,
+            [this](const boost::system::error_code& ec,
+                   const HttpResponsePtr&,
+                   const std::string&) {
+            io_service_.stop();
+            // The server should have returned an IO error.
+            EXPECT_TRUE(ec);
+        }));
+
+        // Actually trigger the request.
+        ASSERT_NO_THROW(runIOService());
+    }
+
+    /// @brief Test that an error is returned by the client if the server
+    /// response is malformed.
+    void testMalformedResponse () {
+        // Start the server.
+        ASSERT_NO_THROW(listener_.start());
+
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL of the server.
+        Url url("http://127.0.0.1:18123");
+
+        // The response is going to be malformed in such a way that it holds
+        // an invalid content type. We affect the content type by creating
+        // a request that holds a JSON parameter requesting a specific
+        // content type.
+        PostHttpRequestJsonPtr request = createRequest("requested-content-type",
+                                                       "text/html");
+        HttpResponseJsonPtr response(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request, response,
+            [this](const boost::system::error_code& ec,
+                   const HttpResponsePtr& response,
+                   const std::string& parsing_error) {
+            io_service_.stop();
+            // There should be no IO error (answer from the server is received).
+            EXPECT_FALSE(ec);
+            // The response object is NULL because it couldn't be finalized.
+            EXPECT_FALSE(response);
+            // The message parsing error should be returned.
+            EXPECT_FALSE(parsing_error.empty());
+        }));
+
+        // Actually trigger the request.
+        ASSERT_NO_THROW(runIOService());
+    }
+
+    /// @brief Test that client times out when it doesn't receive the entire
+    /// response from the server within a desired time.
+    void testClientRequestTimeout() {
+        // Start the server.
+        ASSERT_NO_THROW(listener_.start());
+
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL of the server.
+        Url url("http://127.0.0.1:18123");
+
+        unsigned cb_num = 0;
+
+        // Create the request which asks the server to generate a partial
+        // (although well formed) response. The client will be waiting for the
+        // rest of the response to be provided and will eventually time out.
+        PostHttpRequestJsonPtr request1 = createRequest("partial-response", true);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        // This value will be set to true if the connection close callback is
+        // invoked upon time out.
+        auto connection_closed = false;
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request1, response1,
+            [this, &cb_num](const boost::system::error_code& ec,
+                            const HttpResponsePtr& response,
+                            const std::string&) {
+                if (++cb_num > 1) {
+                    io_service_.stop();
+                }
+                // In this particular case we know exactly the type of the
+                // IO error returned, because the client explicitly sets this
+                // error code.
+                EXPECT_TRUE(ec.value() == boost::asio::error::timed_out);
+                // There should be no response returned.
+                EXPECT_FALSE(response);
+            },
+            HttpClient::RequestTimeout(100),
+            HttpClient::ConnectHandler(),
+            HttpClient::HandshakeHandler(),
+            [&connection_closed](const int) {
+                // This callback is called when the connection gets closed
+                // by the client.
+                connection_closed = true;
+            })
+        );
+
+        // Create another request after the timeout. It should be handled ok.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 1);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request2, response2,
+            [this, &cb_num](const boost::system::error_code& /*ec*/,
+                            const HttpResponsePtr&,
+                            const std::string&) {
+                if (++cb_num > 1) {
+                    io_service_.stop();
+                }
+            }));
+
+        // Actually trigger the requests.
+        ASSERT_NO_THROW(runIOService());
+        // Make sure that the client has closed the connection upon timeout.
+        EXPECT_TRUE(connection_closed);
+    }
+
+    /// @brief Test that client times out when connection takes too long.
+    void testClientConnectTimeout() {
+        // Start the server.
+        ASSERT_NO_THROW(listener_.start());
+
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL of the server.
+        Url url("http://127.0.0.1:18123");
+
+        unsigned cb_num = 0;
+
+        PostHttpRequestJsonPtr request = createRequest("sequence", 1);
+        HttpResponseJsonPtr response(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request, response,
+            [this, &cb_num](const boost::system::error_code& ec,
+                            const HttpResponsePtr& response,
+                            const std::string&) {
+            if (++cb_num > 1) {
+                io_service_.stop();
+            }
+            // In this particular case we know exactly the type of the
+            // IO error returned, because the client explicitly sets this
+            // error code.
+            EXPECT_TRUE(ec.value() == boost::asio::error::timed_out);
+            // There should be no response returned.
+            EXPECT_FALSE(response);
+
+        }, HttpClient::RequestTimeout(100),
+
+           // This callback is invoked upon an attempt to connect to the
+           // server. The false value indicates to the HttpClient to not
+           // try to send a request to the server. This simulates the
+           // case of connect() taking very long and should eventually
+           // cause the transaction to time out.
+           [](const boost::system::error_code& /*ec*/, int) {
+               return (false);
+        }));
+
+        // Create another request after the timeout. It should be handled ok.
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request, response,
+            [this, &cb_num](const boost::system::error_code& /*ec*/,
+                            const HttpResponsePtr&,
+                            const std::string&) {
+                if (++cb_num > 1) {
+                    io_service_.stop();
+                }
+            }));
+
+        // Actually trigger the requests.
+        ASSERT_NO_THROW(runIOService());
+    }
+
+    /// @brief Tests the behavior of the HTTP client when the premature
+    /// timeout occurs.
+    ///
+    /// The premature timeout may occur when the system clock is moved
+    /// during the transaction. This test simulates this behavior by
+    /// starting new transaction and waiting for the timeout to occur
+    /// before the IO service is ran. The timeout handler is invoked
+    /// first and it resets the transaction state. This test verifies
+    /// that the started transaction tears down gracefully after the
+    /// transaction state is reset.
+    ///
+    /// There are two variants of this test. The first variant schedules
+    /// one transaction before running the IO service. The second variant
+    /// schedules two transactions prior to running the IO service. The
+    /// second transaction is queued, so it is expected that it doesn't
+    /// time out and it runs successfully.
+    ///
+    /// @param queue_two_requests Boolean value indicating if a single
+    /// transaction should be queued (false), or two (true).
+    void testClientRequestLateStart(const bool queue_two_requests) {
+        // Start the server.
+        ASSERT_NO_THROW(listener_.start());
+
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL of the server.
+        Url url("http://127.0.0.1:18123");
+
+        // Specify the TLS context of the server.
+        TlsContextPtr tls_context;
+
+        // Generate first request.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+
+        // Use very short timeout to make sure that it occurs before we actually
+        // run the transaction.
+        ASSERT_NO_THROW(client.asyncSendRequest(url, tls_context,
+                                                request1, response1,
+            [](const boost::system::error_code& ec,
+               const HttpResponsePtr& response,
+               const std::string&) {
+
+            // In this particular case we know exactly the type of the
+            // IO error returned, because the client explicitly sets this
+            // error code.
+            EXPECT_TRUE(ec.value() == boost::asio::error::timed_out);
+            // There should be no response returned.
+            EXPECT_FALSE(response);
+        }, HttpClient::RequestTimeout(1)));
+
+        if (queue_two_requests) {
+            PostHttpRequestJsonPtr request2 = createRequest("sequence", 2);
+            HttpResponseJsonPtr response2(new HttpResponseJson());
+            ASSERT_NO_THROW(client.asyncSendRequest(url, tls_context,
+                                                    request2, response2,
+                [](const boost::system::error_code& ec,
+                   const HttpResponsePtr& response,
+                   const std::string&) {
+
+                // This second request should be successful.
+                EXPECT_TRUE(ec.value() == 0);
+                EXPECT_TRUE(response);
+            }));
+        }
+
+        // This waits for 3ms to make sure that the timeout occurs before we
+        // run the transaction. This leads to an unusual situation that the
+        // transaction state is reset as a result of the timeout but the
+        // transaction is alive. We want to make sure that the client can
+        // gracefully deal with this situation.
+        usleep(3000);
+
+        // Run the transaction and hope it will gracefully tear down.
+        ASSERT_NO_THROW(runIOService(100));
+
+        // Now try to send another request to make sure that the client
+        // is healthy.
+        PostHttpRequestJsonPtr request3 = createRequest("sequence", 3);
+        HttpResponseJsonPtr response3(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request3, response3,
+                         [this](const boost::system::error_code& ec,
+                                const HttpResponsePtr&,
+                                const std::string&) {
+            io_service_.stop();
+
+            // Everything should be ok.
+            EXPECT_TRUE(ec.value() == 0);
+        }));
+
+        // Actually trigger the requests.
+        ASSERT_NO_THROW(runIOService());
+    }
+
+    /// @brief Tests that underlying TCP socket can be registered and
+    /// unregistered via connection and close callbacks.
+    ///
+    /// It conducts to consecutive requests over the same client.
+    ///
+    /// @param version HTTP version to be used.
+    void testConnectCloseCallbacks(const HttpVersion& version) {
+        // Start the server.
+        ASSERT_NO_THROW(listener_.start());
+
+        // Create a client and specify the URL on which the server can be reached.
+        HttpClient client(io_service_);
+        Url url("http://127.0.0.1:18123");
+
+        // Initiate request to the server.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1, version);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        unsigned resp_num = 0;
+        ExternalMonitor monitor;
+
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request1, response1,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+
+            EXPECT_FALSE(ec);
+        },
+            HttpClient::RequestTimeout(10000),
+            std::bind(&ExternalMonitor::connectHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::handshakeHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::closeHandler, &monitor, ph::_1)
+        ));
+
+        // Initiate another request to the destination.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2, version);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request2, response2,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            EXPECT_FALSE(ec);
+        },
+            HttpClient::RequestTimeout(10000),
+            std::bind(&ExternalMonitor::connectHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::handshakeHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::closeHandler, &monitor, ph::_1)
+        ));
+
+        // Actually trigger the requests. The requests should be handlded by the
+        // server one after another. While the first request is being processed
+        // the server should queue another one.
+        ASSERT_NO_THROW(runIOService());
+
+        // We should have had 2 connect invocations, no closes
+        // and a valid registered fd
+        EXPECT_EQ(2, monitor.connect_cnt_);
+        EXPECT_EQ(0, monitor.close_cnt_);
+        EXPECT_GT(monitor.registered_fd_, -1);
+
+        // Make sure that the received responses are different. We check that by
+        // comparing value of the sequence parameters.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+        EXPECT_NE(sequence1->intValue(), sequence2->intValue());
+
+        // Stopping the client the close the connection.
+        client.stop();
+
+        // We should have had 2 connect invocations, 1 closes
+        // and an invalid registered fd
+        EXPECT_EQ(2, monitor.connect_cnt_);
+        EXPECT_EQ(1, monitor.close_cnt_);
+        EXPECT_EQ(-1, monitor.registered_fd_);
+    }
+
+    /// @brief Tests detection and handling out-of-band socket events
+    ///
+    /// It initiates a transaction and verifies that a mid-transaction call
+    /// to HttpClient::closeIfOutOfBand() has no affect on the connection.
+    /// After successful completion of the transaction, a second call to
+    /// HttpClient::closeIfOutOfBand() is made. This should result in the
+    /// connection being closed.
+    /// This step is repeated to verify that after an OOB closure, transactions
+    /// to the same destination can be processed.
+    ///
+    /// Lastly, we verify that HttpClient::stop() closes the connection correctly.
+    ///
+    /// @param version HTTP version to be used.
+    void testCloseIfOutOfBand(const HttpVersion& version) {
+        // Start the server.
+        ASSERT_NO_THROW(listener_.start());
+
+        // Create a client and specify the URL on which the server can be reached.
+        HttpClient client(io_service_);
+        Url url("http://127.0.0.1:18123");
+
+        // Initiate request to the server.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1, version);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        unsigned resp_num = 0;
+        ExternalMonitor monitor;
+
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request1, response1,
+            [this, &client, &resp_num, &monitor](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num == 1) {
+                io_service_.stop();
+            }
+
+            EXPECT_EQ(1, monitor.connect_cnt_);      // We should have 1 connect.
+            EXPECT_EQ(0, monitor.close_cnt_);        // We should have 0 closes
+            ASSERT_GT(monitor.registered_fd_, -1);   // We should have a valid fd.
+            int orig_fd = monitor.registered_fd_;
+
+            // Test our socket for OOBness.
+            client.closeIfOutOfBand(monitor.registered_fd_);
+
+            // Since we're in a transaction, we should have no closes and
+            // the same valid fd.
+            EXPECT_EQ(0, monitor.close_cnt_);
+            ASSERT_EQ(monitor.registered_fd_, orig_fd);
+
+            EXPECT_FALSE(ec);
+        },
+            HttpClient::RequestTimeout(10000),
+            std::bind(&ExternalMonitor::connectHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::handshakeHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::closeHandler, &monitor, ph::_1)
+        ));
+
+        // Actually trigger the requests. The requests should be handlded by the
+        // server one after another. While the first request is being processed
+        // the server should queue another one.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure that we received a response.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+        EXPECT_EQ(1, sequence1->intValue());
+
+        // We should have had 1 connect invocations, no closes
+        // and a valid registered fd
+        EXPECT_EQ(1, monitor.connect_cnt_);
+        EXPECT_EQ(0, monitor.close_cnt_);
+        EXPECT_GT(monitor.registered_fd_, -1);
+
+        // Test our socket for OOBness.
+        client.closeIfOutOfBand(monitor.registered_fd_);
+
+        // Since we're in a transaction, we should have no closes and
+        // the same valid fd.
+        EXPECT_EQ(1, monitor.close_cnt_);
+        EXPECT_EQ(-1, monitor.registered_fd_);
+
+        // Now let's do another request to the destination to verify that
+        // we'll reopen the connection without issue.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2, version);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        resp_num = 0;
+        ASSERT_NO_THROW(client.asyncSendRequest(url, TlsContextPtr(),
+                                                request2, response2,
+            [this, &client, &resp_num, &monitor](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num == 1) {
+                io_service_.stop();
+            }
+
+            EXPECT_EQ(2, monitor.connect_cnt_);      // We should have 1 connect.
+            EXPECT_EQ(1, monitor.close_cnt_);        // We should have 0 closes
+            ASSERT_GT(monitor.registered_fd_, -1);   // We should have a valid fd.
+            int orig_fd = monitor.registered_fd_;
+
+            // Test our socket for OOBness.
+            client.closeIfOutOfBand(monitor.registered_fd_);
+
+            // Since we're in a transaction, we should have no closes and
+            // the same valid fd.
+            EXPECT_EQ(1, monitor.close_cnt_);
+            ASSERT_EQ(monitor.registered_fd_, orig_fd);
+
+            EXPECT_FALSE(ec);
+        },
+            HttpClient::RequestTimeout(10000),
+            std::bind(&ExternalMonitor::connectHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::handshakeHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::closeHandler, &monitor, ph::_1)
+        ));
+
+        // Actually trigger the requests. The requests should be handlded by the
+        // server one after another. While the first request is being processed
+        // the server should queue another one.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure that we received the second response.
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+        EXPECT_EQ(2, sequence2->intValue());
+
+        // Stopping the client the close the connection.
+        client.stop();
+
+        // We should have had 2 connect invocations, 2 closes
+        // and an invalid registered fd
+        EXPECT_EQ(2, monitor.connect_cnt_);
+        EXPECT_EQ(2, monitor.close_cnt_);
+        EXPECT_EQ(-1, monitor.registered_fd_);
+    }
+
+    /// @brief Simulates external registery of Connection TCP sockets
+    ///
+    /// Provides methods compatible with Connection callbacks for connect
+    /// and close operations.
+    class ExternalMonitor {
+    public:
+        /// @brief Constructor
+        ExternalMonitor()
+            : registered_fd_(-1), connect_cnt_(0), close_cnt_(0) {
+        }
+
+        /// @brief Connect callback handler
+        /// @param ec Error status of the ASIO connect
+        /// @param tcp_native_fd socket descriptor to register
+        bool connectHandler(const boost::system::error_code& ec, int tcp_native_fd) {
+            ++connect_cnt_;
+            if ((!ec || (ec.value() == boost::asio::error::in_progress))
+                && (tcp_native_fd >= 0)) {
+                registered_fd_ = tcp_native_fd;
+                return (true);
+            } else if ((ec.value() == boost::asio::error::already_connected)
+                       && (registered_fd_ != tcp_native_fd)) {
+                return (false);
+            }
+
+            // ec indicates an error, return true, so that error can be handled
+            // by Connection logic.
+            return (true);
+        }
+
+        /// @brief Handshake callback handler
+        /// @param ec Error status of the ASIO connect
+        bool handshakeHandler(const boost::system::error_code&, int) {
+            ADD_FAILURE() << "handshake callback handler is called";
+            // ec indicates an error, return true, so that error can be handled
+            // by Connection logic.
+            return (true);
+        }
+
+        /// @brief Close callback handler
+        ///
+        /// @param tcp_native_fd socket descriptor to register
+        void closeHandler(int tcp_native_fd) {
+            ++close_cnt_;
+            EXPECT_EQ(tcp_native_fd, registered_fd_) << "closeHandler fd mismatch";
+            if (tcp_native_fd >= 0) {
+                registered_fd_ = -1;
+            }
+        }
+
+        /// @brief Keeps track of socket currently "registered" for external monitoring.
+        int registered_fd_;
+
+        /// @brief Tracks how many times the connect callback is invoked.
+        int connect_cnt_;
+
+        /// @brief Tracks how many times the close callback is invoked.
+        int close_cnt_;
+    };
+
+    /// @brief Instance of the listener used in the tests.
+    HttpListener listener_;
+
+    /// @brief Instance of the second listener used in the tests.
+    HttpListener listener2_;
+
+    /// @brief Instance of the third listener used in the tests (with short idle
+    /// timeout).
+    HttpListener listener3_;
+
+};
+
+// Test that two consecutive requests can be sent over the same (persistent)
+// connection.
+TEST_F(HttpClientTest, consecutiveRequests) {
+    ASSERT_NO_FATAL_FAILURE(testConsecutiveRequests(HttpVersion(1, 1)));
+}
+
+// Test that two consecutive requests can be sent over the same (persistent)
+// connection.
+TEST_F(HttpClientTest, consecutiveRequestsMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testConsecutiveRequests(HttpVersion(1, 1)));
+}
+
+// Test that two consecutive requests can be sent over non-persistent connection.
+// This is achieved by sending HTTP/1.0 requests, which are non-persistent by
+// default. The client should close the connection right after receiving a response
+// from the server.
+TEST_F(HttpClientTest, closeBetweenRequests) {
+    ASSERT_NO_FATAL_FAILURE(testConsecutiveRequests(HttpVersion(1, 0)));
+}
+
+// Test that two consecutive requests can be sent over non-persistent connection.
+// This is achieved by sending HTTP/1.0 requests, which are non-persistent by
+// default. The client should close the connection right after receiving a response
+// from the server.
+TEST_F(HttpClientTest, closeBetweenRequestsMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testConsecutiveRequests(HttpVersion(1, 0)));
+}
+
+// Test that the client can communicate with two different destinations
+// simultaneously.
+TEST_F(HttpClientTest, multipleDestinations) {
+    ASSERT_NO_FATAL_FAILURE(testMultipleDestinations());
+}
+
+// Test that the client can communicate with two different destinations
+// simultaneously.
+TEST_F(HttpClientTest, multipleDestinationsMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testMultipleDestinations());
+}
+
+// Test that the client can use two different TLS contexts to the same
+// destination address and port simultaneously.
+TEST_F(HttpClientTest, multipleTlsContexts) {
+    ASSERT_NO_FATAL_FAILURE(testMultipleTlsContexts());
+}
+
+// Test that the client can use two different TLS contexts to the same
+// destination address and port simultaneously.
+TEST_F(HttpClientTest, multipleTlsContextsMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testMultipleTlsContexts());
+}
+
+// Test that idle connection can be resumed for second request.
+TEST_F(HttpClientTest, idleConnection) {
+    ASSERT_NO_FATAL_FAILURE(testIdleConnection());
+}
+
+// Test that idle connection can be resumed for second request.
+TEST_F(HttpClientTest, idleConnectionMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testIdleConnection());
+}
+
+// This test verifies that the client returns IO error code when the
+// server is unreachable.
+TEST_F(HttpClientTest, unreachable) {
+    ASSERT_NO_FATAL_FAILURE(testUnreachable());
+}
+
+// This test verifies that the client returns IO error code when the
+// server is unreachable.
+TEST_F(HttpClientTest, unreachableMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testUnreachable());
+}
+
+// Test that an error is returned by the client if the server response is
+// malformed.
+TEST_F(HttpClientTest, malformedResponse) {
+    ASSERT_NO_FATAL_FAILURE(testMalformedResponse());
+}
+
+// Test that an error is returned by the client if the server response is
+// malformed.
+TEST_F(HttpClientTest, malformedResponseMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testMalformedResponse());
+}
+
+// Test that client times out when it doesn't receive the entire response
+// from the server within a desired time.
+TEST_F(HttpClientTest, clientRequestTimeout) {
+    ASSERT_NO_FATAL_FAILURE(testClientRequestTimeout());
+}
+
+// Test that client times out when it doesn't receive the entire response
+// from the server within a desired time.
+TEST_F(HttpClientTest, clientRequestTimeoutMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testClientRequestTimeout());
+}
+
+// This test verifies the behavior of the HTTP client when the premature
+// (and unexpected) timeout occurs. The premature timeout may be caused
+// by the system clock move.
+TEST_F(HttpClientTest, clientRequestLateStartNoQueue) {
+    testClientRequestLateStart(false);
+}
+
+// This test verifies the behavior of the HTTP client when the premature
+// (and unexpected) timeout occurs. The premature timeout may be caused
+// by the system clock move.
+TEST_F(HttpClientTest, clientRequestLateStartNoQueueMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    testClientRequestLateStart(false);
+}
+
+// This test verifies the behavior of the HTTP client when the premature
+// timeout occurs and there are requests queued after the request which
+// times out.
+TEST_F(HttpClientTest, clientRequestLateStartQueue) {
+    testClientRequestLateStart(true);
+}
+
+// This test verifies the behavior of the HTTP client when the premature
+// timeout occurs and there are requests queued after the request which
+// times out.
+TEST_F(HttpClientTest, clientRequestLateStartQueueMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    testClientRequestLateStart(true);
+}
+
+// Test that client times out when connection takes too long.
+TEST_F(HttpClientTest, clientConnectTimeout) {
+    ASSERT_NO_FATAL_FAILURE(testClientConnectTimeout());
+}
+
+// Test that client times out when connection takes too long.
+TEST_F(HttpClientTest, clientConnectTimeoutMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testClientConnectTimeout());
+}
+
+/// Tests that connect and close callbacks work correctly.
+TEST_F(HttpClientTest, connectCloseCallbacks) {
+    ASSERT_NO_FATAL_FAILURE(testConnectCloseCallbacks(HttpVersion(1, 1)));
+}
+
+/// Tests that connect and close callbacks work correctly.
+TEST_F(HttpClientTest, connectCloseCallbacksMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testConnectCloseCallbacks(HttpVersion(1, 1)));
+}
+
+/// Tests that HttpClient::closeIfOutOfBand works correctly.
+TEST_F(HttpClientTest, closeIfOutOfBand) {
+    ASSERT_NO_FATAL_FAILURE(testCloseIfOutOfBand(HttpVersion(1, 1)));
+}
+
+/// Tests that HttpClient::closeIfOutOfBand works correctly.
+TEST_F(HttpClientTest, closeIfOutOfBandMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testCloseIfOutOfBand(HttpVersion(1, 1)));
+}
+
+}
diff --git a/src/lib/http/tests/test_http_client.h b/src/lib/http/tests/test_http_client.h
new file mode 100644
index 0000000..f95b111
--- /dev/null
+++ b/src/lib/http/tests/test_http_client.h
@@ -0,0 +1,273 @@
+// Copyright (C) 2017-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef TEST_HTTP_CLIENT_H
+#define TEST_HTTP_CLIENT_H
+
+#include <cc/data.h>
+#include <http/client.h>
+#include <http/http_types.h>
+
+#include <boost/asio/read.hpp>
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/ip/tcp.hpp>
+#include <gtest/gtest.h>
+
+using namespace boost::asio::ip;
+using namespace isc::asiolink;
+
+/// @brief Entity which can connect to the HTTP server endpoint.
+class TestHttpClient : public boost::noncopyable {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// This constructor creates new socket instance. It doesn't connect. Call
+    /// connect() to connect to the server.
+    ///
+    /// @param io_service IO service to be stopped on error or completion.
+    /// @param server_address string containing the IP address of the server.
+    /// @param port port number of the server.
+    explicit TestHttpClient(IOService& io_service,
+                            const std::string& server_address = "127.0.0.1",
+                            uint16_t port = 18123)
+        : io_service_(io_service.get_io_service()), socket_(io_service_),
+          buf_(), response_(), server_address_(server_address),
+          server_port_(port), receive_done_(false) {
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Closes the underlying socket if it is open.
+    ~TestHttpClient() {
+        close();
+    }
+
+    /// @brief Send HTTP request specified in textual format.
+    ///
+    /// @param request HTTP request in the textual format.
+    void startRequest(const std::string& request) {
+        tcp::endpoint endpoint(address::from_string(server_address_), server_port_);
+        socket_.async_connect(endpoint,
+        [this, request](const boost::system::error_code& ec) {
+            receive_done_ = false;
+            if (ec) {
+                // One would expect that async_connect wouldn't return
+                // EINPROGRESS error code, but simply wait for the connection
+                // to get established before the handler is invoked. It turns out,
+                // however, that on some OSes the connect handler may receive this
+                // error code which doesn't necessarily indicate a problem.
+                // Making an attempt to write and read from this socket will
+                // typically succeed. So, we ignore this error.
+                if (ec.value() != boost::asio::error::in_progress) {
+                    ADD_FAILURE() << "error occurred while connecting: "
+                                  << ec.message();
+                    io_service_.stop();
+                    return;
+                }
+            }
+            sendRequest(request);
+        });
+    }
+
+    /// @brief Send HTTP request.
+    ///
+    /// @param request HTTP request in the textual format.
+    void sendRequest(const std::string& request) {
+        sendPartialRequest(request);
+    }
+
+    /// @brief Send part of the HTTP request.
+    ///
+    /// @param request part of the HTTP request to be sent.
+    void sendPartialRequest(std::string request) {
+        socket_.async_send(boost::asio::buffer(request.data(), request.size()),
+                           [this, request](const boost::system::error_code& ec,
+                                           std::size_t bytes_transferred) mutable {
+            if (ec) {
+                if (ec.value() == boost::asio::error::operation_aborted) {
+                    return;
+
+                } else if ((ec.value() == boost::asio::error::try_again) ||
+                           (ec.value() == boost::asio::error::would_block)) {
+                    // If we should try again make sure there is no garbage in the
+                    // bytes_transferred.
+                    bytes_transferred = 0;
+
+                } else {
+                    ADD_FAILURE() << "error occurred while connecting: "
+                                  << ec.message();
+                    io_service_.stop();
+                    return;
+                }
+            }
+
+            // Remove the part of the request which has been sent.
+            if (bytes_transferred > 0 && (request.size() <= bytes_transferred)) {
+                request.erase(0, bytes_transferred);
+            }
+
+            // Continue sending request data if there are still some data to be
+            // sent.
+            if (!request.empty()) {
+                sendPartialRequest(request);
+
+            } else {
+                // Request has been sent. Start receiving response.
+                response_.clear();
+                receivePartialResponse();
+            }
+       });
+    }
+
+    /// @brief Receive response from the server.
+    void receivePartialResponse() {
+        socket_.async_read_some(boost::asio::buffer(buf_.data(), buf_.size()),
+                                [this](const boost::system::error_code& ec,
+                                       std::size_t bytes_transferred) {
+            if (ec) {
+                // IO service stopped so simply return.
+                if (ec.value() == boost::asio::error::operation_aborted) {
+                    return;
+
+                } else if ((ec.value() == boost::asio::error::try_again) ||
+                           (ec.value() == boost::asio::error::would_block)) {
+                    // If we should try again, make sure that there is no garbage
+                    // in the bytes_transferred.
+                    bytes_transferred = 0;
+
+                } else {
+                    // Error occurred, bail...
+                    ADD_FAILURE() << "error occurred while receiving HTTP"
+                        " response from the server: " << ec.message();
+                    io_service_.stop();
+                }
+            }
+
+            if (bytes_transferred > 0) {
+                response_.insert(response_.end(), buf_.data(),
+                                 buf_.data() + bytes_transferred);
+            }
+
+            // Two consecutive new lines end the part of the response we're
+            // expecting.
+            if (response_.find("\r\n\r\n", 0) != std::string::npos) {
+                receive_done_ = true;
+                io_service_.stop();
+            } else {
+                receivePartialResponse();
+            }
+        });
+    }
+
+    /// @brief Checks if the TCP connection is still open.
+    ///
+    /// Tests the TCP connection by trying to read from the socket.
+    /// Unfortunately expected failure depends on a race between the read
+    /// and the other side close so to check if the connection is closed
+    /// please use @c isConnectionClosed instead.
+    ///
+    /// @return true if the TCP connection is open.
+    bool isConnectionAlive() {
+        // Remember the current non blocking setting.
+        const bool non_blocking_orig = socket_.non_blocking();
+        // Set the socket to non blocking mode. We're going to test if the socket
+        // returns would_block status on the attempt to read from it.
+        socket_.non_blocking(true);
+
+        // We need to provide a buffer for a call to read.
+        char data[2];
+        boost::system::error_code ec;
+        boost::asio::read(socket_, boost::asio::buffer(data, sizeof(data)), ec);
+
+        // Revert the original non_blocking flag on the socket.
+        socket_.non_blocking(non_blocking_orig);
+
+        // If the connection is alive we'd typically get would_block status code.
+        // If there are any data that haven't been read we may also get success
+        // status. We're guessing that try_again may also be returned by some
+        // implementations in some situations. Any other error code indicates a
+        // problem with the connection so we assume that the connection has been
+        // closed.
+        return (!ec || (ec.value() == boost::asio::error::try_again) ||
+                (ec.value() == boost::asio::error::would_block));
+    }
+
+    /// @brief Checks if the TCP connection is already closed.
+    ///
+    /// Tests the TCP connection by trying to read from the socket.
+    /// The read can block so this must be used to check if a connection
+    /// is alive so to check if the connection is alive please always
+    /// use @c isConnectionAlive.
+    ///
+    /// @return true if the TCP connection is closed.
+    bool isConnectionClosed() {
+        // Remember the current non blocking setting.
+        const bool non_blocking_orig = socket_.non_blocking();
+        // Set the socket to blocking mode. We're going to test if the socket
+        // returns eof status on the attempt to read from it.
+        socket_.non_blocking(false);
+
+        // We need to provide a buffer for a call to read.
+        char data[2];
+        boost::system::error_code ec;
+        boost::asio::read(socket_, boost::asio::buffer(data, sizeof(data)), ec);
+
+        // Revert the original non_blocking flag on the socket.
+        socket_.non_blocking(non_blocking_orig);
+
+        // If the connection is closed we'd typically get eof status code.
+        return (ec.value() == boost::asio::error::eof);
+    }
+
+    /// @brief Close connection.
+    void close() {
+        socket_.close();
+    }
+
+    /// @brief Returns the HTTP response string.
+    ///
+    /// @return string containing the response.
+    std::string getResponse() const {
+        return (response_);
+    }
+
+    /// @brief Returns true if the receive completed without error.
+    ///
+    /// @return True if the receive completed successfully, false
+    /// otherwise.
+    bool receiveDone() {
+        return (receive_done_);
+    }
+
+private:
+
+    /// @brief Holds reference to the IO service.
+    boost::asio::io_service& io_service_;
+
+    /// @brief A socket used for the connection.
+    boost::asio::ip::tcp::socket socket_;
+
+    /// @brief Buffer into which response is written.
+    std::array<char, 8192> buf_;
+
+    /// @brief Response in the textual format.
+    std::string response_;
+
+    /// @brief IP address of the server.
+    std::string server_address_;
+
+    /// @brief IP port of the server.
+    uint16_t server_port_;
+
+    /// @brief Set to true when the receive has completed successfully.
+    bool receive_done_;
+};
+
+/// @brief Pointer to the TestHttpClient.
+typedef boost::shared_ptr<TestHttpClient> TestHttpClientPtr;
+
+#endif
diff --git a/src/lib/http/tests/testdata/empty b/src/lib/http/tests/testdata/empty
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/lib/http/tests/testdata/empty
diff --git a/src/lib/http/tests/testdata/hiddenp b/src/lib/http/tests/testdata/hiddenp
new file mode 100644
index 0000000..e8b2395
--- /dev/null
+++ b/src/lib/http/tests/testdata/hiddenp
@@ -0,0 +1 @@
+KeaTest
\ No newline at end of file
diff --git a/src/lib/http/tests/testdata/hiddens b/src/lib/http/tests/testdata/hiddens
new file mode 100644
index 0000000..f52fb83
--- /dev/null
+++ b/src/lib/http/tests/testdata/hiddens
@@ -0,0 +1 @@
+kea:test
\ No newline at end of file
diff --git a/src/lib/http/tests/testdata/hiddenu b/src/lib/http/tests/testdata/hiddenu
new file mode 100644
index 0000000..801489a
--- /dev/null
+++ b/src/lib/http/tests/testdata/hiddenu
@@ -0,0 +1 @@
+keatest
\ No newline at end of file
diff --git a/src/lib/http/tests/tls_client_unittests.cc b/src/lib/http/tests/tls_client_unittests.cc
new file mode 100644
index 0000000..4d82e95
--- /dev/null
+++ b/src/lib/http/tests/tls_client_unittests.cc
@@ -0,0 +1,1398 @@
+// Copyright (C) 2017-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/interval_timer.h>
+#include <asiolink/tls_acceptor.h>
+#include <asiolink/testutils/test_tls.h>
+#include <cc/data.h>
+#include <http/client.h>
+#include <http/http_types.h>
+#include <http/listener.h>
+#include <http/listener_impl.h>
+#include <http/post_request_json.h>
+#include <http/response_creator.h>
+#include <http/response_creator_factory.h>
+#include <http/response_json.h>
+#include <http/tests/response_test.h>
+#include <http/url.h>
+#include <util/multi_threading_mgr.h>
+
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/ip/tcp.hpp>
+#include <boost/pointer_cast.hpp>
+#include <gtest/gtest.h>
+
+#include <functional>
+#include <list>
+#include <sstream>
+#include <string>
+
+#ifdef WITH_BOTAN
+#define DISABLE_SOME_TESTS
+#endif
+#ifdef WITH_OPENSSL
+#if !defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER < 0x10100000L)
+#define DISABLE_SOME_TESTS
+#endif
+#endif
+
+using namespace boost::asio;
+using namespace boost::asio::ip;
+using namespace isc::asiolink;
+using namespace isc::asiolink::test;
+using namespace isc::data;
+using namespace isc::http;
+using namespace isc::http::test;
+using namespace isc::util;
+namespace ph = std::placeholders;
+
+/// @todo: put the common part of client and server tests in its own file(s).
+
+namespace {
+
+/// @brief IP address to which HTTP service is bound.
+const std::string SERVER_ADDRESS = "127.0.0.1";
+
+/// @brief IPv6 address to whch HTTP service is bound.
+const std::string IPV6_SERVER_ADDRESS = "::1";
+
+/// @brief Port number to which HTTP service is bound.
+const unsigned short SERVER_PORT = 18123;
+
+/// @brief Request Timeout used in most of the tests (ms).
+const long REQUEST_TIMEOUT = 10000;
+
+/// @brief Persistent connection idle timeout used in most of the tests (ms).
+const long IDLE_TIMEOUT = 10000;
+
+/// @brief Persistent connection idle timeout used in tests where idle connections
+/// are tested (ms).
+const long SHORT_IDLE_TIMEOUT = 200;
+
+/// @brief Test timeout (ms).
+const long TEST_TIMEOUT = 10000;
+
+/// @brief Test HTTP response.
+typedef TestHttpResponseBase<HttpResponseJson> Response;
+
+/// @brief Pointer to test HTTP response.
+typedef boost::shared_ptr<Response> ResponsePtr;
+
+/// @brief Generic test HTTP response.
+typedef TestHttpResponseBase<HttpResponse> GenericResponse;
+
+/// @brief Pointer to generic test HTTP response.
+typedef boost::shared_ptr<GenericResponse> GenericResponsePtr;
+
+/// @brief Implementation of the @ref HttpResponseCreator.
+class TestHttpResponseCreator : public HttpResponseCreator {
+public:
+
+    /// @brief Create a new request.
+    ///
+    /// @return Pointer to the new instance of the @ref HttpRequest.
+    virtual HttpRequestPtr
+    createNewHttpRequest() const {
+        return (HttpRequestPtr(new PostHttpRequestJson()));
+    }
+
+private:
+
+    /// @brief Creates HTTP response.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP response.
+    virtual HttpResponsePtr
+    createStockHttpResponse(const HttpRequestPtr& request,
+                            const HttpStatusCode& status_code) const {
+        // The request hasn't been finalized so the request object
+        // doesn't contain any information about the HTTP version number
+        // used. But, the context should have this data (assuming the
+        // HTTP version is parsed ok).
+        HttpVersion http_version(request->context()->http_version_major_,
+                                 request->context()->http_version_minor_);
+        // This will generate the response holding JSON content.
+        ResponsePtr response(new Response(http_version, status_code));
+        response->finalize();
+        return (response);
+    }
+
+    /// @brief Creates HTTP response.
+    ///
+    /// This method generates 3 types of responses:
+    /// - response with a requested content type,
+    /// - partial response with incomplete JSON body,
+    /// - response with JSON body copied from the request.
+    ///
+    /// The first one is useful to test situations when received response can't
+    /// be parsed because of the content type mismatch. The second one is useful
+    /// to test request timeouts. The third type is used by most of the unit tests
+    /// to test successful transactions.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP OK response with no content.
+    virtual HttpResponsePtr
+    createDynamicHttpResponse(HttpRequestPtr request) {
+        // Check access parameters.
+        if (HttpRequest::recordSubject_) {
+            EXPECT_TRUE(request->getTls());
+            EXPECT_EQ("kea-client", request->getSubject());
+        }
+        if (HttpRequest::recordIssuer_) {
+            EXPECT_TRUE(request->getTls());
+            EXPECT_EQ("kea-ca", request->getIssuer());
+        }
+        // Request must always be JSON.
+        PostHttpRequestJsonPtr request_json =
+            boost::dynamic_pointer_cast<PostHttpRequestJson>(request);
+        ConstElementPtr body;
+        if (request_json) {
+            body = request_json->getBodyAsJson();
+            if (body) {
+                // Check if the client requested one of the two first response
+                // types.
+                GenericResponsePtr response;
+                ConstElementPtr content_type = body->get("requested-content-type");
+                ConstElementPtr partial_response = body->get("partial-response");
+                if (content_type || partial_response) {
+                    // The first two response types can only be generated using the
+                    // generic response as we have to explicitly modify some of the
+                    // values.
+                    response.reset(new GenericResponse(request->getHttpVersion(),
+                                                       HttpStatusCode::OK));
+                    HttpResponseContextPtr ctx = response->context();
+
+                    if (content_type) {
+                        // Provide requested content type.
+                        ctx->headers_.push_back(HttpHeaderContext("Content-Type",
+                                                                  content_type->stringValue()));
+                        // It doesn't matter what body is there.
+                        ctx->body_ = "abcd";
+                        response->finalize();
+
+                    } else {
+                        // Generate JSON response.
+                        ctx->headers_.push_back(HttpHeaderContext("Content-Type",
+                                                                  "application/json"));
+                        // The body lacks '}' so the client will be waiting for it and
+                        // eventually should time out.
+                        ctx->body_ = "{";
+                        response->finalize();
+                        // The auto generated Content-Length header would be based on the
+                        // body size (so set to 1 byte). We have to override it to
+                        // account for the missing '}' character.
+                        response->setContentLength(2);
+                    }
+                    return (response);
+                }
+            }
+        }
+
+        // Third type of response is requested.
+        ResponsePtr response(new Response(request->getHttpVersion(),
+                                          HttpStatusCode::OK));
+        // If body was included in the request. Let's copy it.
+        if (body) {
+            response->setBodyAsJson(body);
+        }
+
+        response->finalize();
+        return (response);
+    }
+};
+
+/// @brief Implementation of the test @ref HttpResponseCreatorFactory.
+///
+/// This factory class creates @ref TestHttpResponseCreator instances.
+class TestHttpResponseCreatorFactory : public HttpResponseCreatorFactory {
+public:
+
+    /// @brief Creates @ref TestHttpResponseCreator instance.
+    virtual HttpResponseCreatorPtr create() const {
+        HttpResponseCreatorPtr response_creator(new TestHttpResponseCreator());
+        return (response_creator);
+    }
+};
+
+/// @brief Test fixture class for @ref HttpListener.
+class HttpListenerTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// Starts test timer which detects timeouts.
+    HttpListenerTest()
+        : io_service_(), factory_(new TestHttpResponseCreatorFactory()),
+          test_timer_(io_service_), run_io_service_timer_(io_service_) {
+        test_timer_.setup(std::bind(&HttpListenerTest::timeoutHandler, this, true),
+                          TEST_TIMEOUT, IntervalTimer::ONE_SHOT);
+    }
+
+    /// @brief Callback function invoke upon test timeout.
+    ///
+    /// It stops the IO service and reports test timeout.
+    ///
+    /// @param fail_on_timeout Specifies if test failure should be reported.
+    void timeoutHandler(const bool fail_on_timeout) {
+        if (fail_on_timeout) {
+            ADD_FAILURE() << "Timeout occurred while running the test!";
+        }
+        io_service_.stop();
+    }
+
+    /// @brief Runs IO service with optional timeout.
+    ///
+    /// @param timeout Optional value specifying for how long the io service
+    /// should be ran (ms).
+    void runIOService(long timeout = 0) {
+        io_service_.get_io_service().reset();
+
+        if (timeout > 0) {
+            run_io_service_timer_.setup(std::bind(&HttpListenerTest::timeoutHandler,
+                                                  this, false),
+                                        timeout, IntervalTimer::ONE_SHOT);
+        }
+        io_service_.run();
+        io_service_.get_io_service().reset();
+        io_service_.poll();
+    }
+
+    /// @brief IO service used in the tests.
+    IOService io_service_;
+
+    /// @brief Pointer to the response creator factory.
+    HttpResponseCreatorFactoryPtr factory_;
+
+    /// @brief Asynchronous timer service to detect timeouts.
+    IntervalTimer test_timer_;
+
+    /// @brief Asynchronous timer for running IO service for a specified amount
+    /// of time.
+    IntervalTimer run_io_service_timer_;
+};
+
+/// @brief Test fixture class for testing HTTP client.
+class HttpsClientTest : public HttpListenerTest {
+public:
+
+    /// @brief Constructor.
+    HttpsClientTest()
+        : HttpListenerTest(), listener_(), listener2_(), listener3_(),
+          server_context_(), client_context_() {
+        configServer(server_context_);
+        configClient(client_context_);
+        listener_.reset(new HttpListener(io_service_,
+                                         IOAddress(SERVER_ADDRESS),
+                                         SERVER_PORT,
+                                         server_context_,
+                                         factory_,
+                                         HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                                         HttpListener::IdleTimeout(IDLE_TIMEOUT)));
+        listener2_.reset(new HttpListener(io_service_,
+                                          IOAddress(IPV6_SERVER_ADDRESS),
+                                          SERVER_PORT + 1,
+                                          server_context_,
+                                          factory_,
+                                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                                          HttpListener::IdleTimeout(IDLE_TIMEOUT)));
+        listener3_.reset(new HttpListener(io_service_,
+                                          IOAddress(SERVER_ADDRESS),
+                                          SERVER_PORT + 2,
+                                          server_context_,
+                                          factory_,
+                                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                                          HttpListener::IdleTimeout(SHORT_IDLE_TIMEOUT)));
+        MultiThreadingMgr::instance().setMode(false);
+    }
+
+    /// @brief Destructor.
+    ~HttpsClientTest() {
+        listener_->stop();
+        listener2_->stop();
+        listener3_->stop();
+        io_service_.poll();
+        MultiThreadingMgr::instance().setMode(false);
+        HttpRequest::recordSubject_ = false;
+        HttpRequest::recordIssuer_ = false;
+    }
+
+    /// @brief Creates HTTP request with JSON body.
+    ///
+    /// It includes a JSON parameter with a specified value.
+    ///
+    /// @param parameter_name JSON parameter to be included.
+    /// @param value JSON parameter value.
+    /// @param version HTTP version to be used. Default is HTTP/1.1.
+    template<typename ValueType>
+    PostHttpRequestJsonPtr createRequest(const std::string& parameter_name,
+                                         const ValueType& value,
+                                         const HttpVersion& version = HttpVersion(1, 1)) {
+        // Create POST request with JSON body.
+        PostHttpRequestJsonPtr request(new PostHttpRequestJson(HttpRequest::Method::HTTP_POST,
+                                                               "/", version));
+        // Body is a map with a specified parameter included.
+        ElementPtr body = Element::createMap();
+        body->set(parameter_name, Element::create(value));
+        request->setBodyAsJson(body);
+        try {
+            request->finalize();
+
+        } catch (const std::exception& ex) {
+            ADD_FAILURE() << "failed to create request: " << ex.what();
+        }
+
+        return (request);
+    }
+
+    /// @brief Test that two consecutive requests can be sent over the same
+    /// connection (if persistent, if not persistent two connections will
+    /// be used).
+    ///
+    /// @param version HTTP version to be used.
+    void testConsecutiveRequests(const HttpVersion& version) {
+        // Start the server.
+        ASSERT_NO_THROW(listener_->start());
+
+        // Create a client and specify the URL on which the server can be reached.
+        HttpClient client(io_service_);
+        Url url("http://127.0.0.1:18123");
+
+        // Initiate request to the server.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1, version);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        unsigned resp_num = 0;
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request1, response1,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Initiate another request to the destination.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2, version);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request2, response2,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Actually trigger the requests. The requests should be handlded by the
+        // server one after another. While the first request is being processed
+        // the server should queue another one.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure that the received responses are different. We check that by
+        // comparing value of the sequence parameters.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+
+        EXPECT_NE(sequence1->intValue(), sequence2->intValue());
+    }
+
+    /// @brief Test that the client can communicate with two different
+    /// destinations simultaneously.
+    void testMultipleDestinations() {
+        // Start two servers running on different ports.
+        ASSERT_NO_THROW(listener_->start());
+        ASSERT_NO_THROW(listener2_->start());
+
+        // Create the client. It will be communicating with the two servers.
+        HttpClient client(io_service_);
+
+        // Specify the URLs on which the servers are available.
+        Url url1("http://127.0.0.1:18123");
+        Url url2("http://[::1]:18124");
+
+        // Create a request to the first server.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        unsigned resp_num = 0;
+        ASSERT_NO_THROW(client.asyncSendRequest(url1, client_context_,
+                                                request1, response1,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Create a request to the second server.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url2, client_context_,
+                                                request2, response2,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Actually trigger the requests.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure we have received two different responses.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+
+        EXPECT_NE(sequence1->intValue(), sequence2->intValue());
+    }
+
+    /// @brief Test that the client can communicate with the same destination
+    /// address and port but with different TLS contexts so
+    void testMultipleTlsContexts() {
+        // Start only one server.
+        ASSERT_NO_THROW(listener_->start());
+
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Create a second client context.
+        TlsContextPtr client_context2;
+        configClient(client_context2);
+
+        // Specify the URL on which the server is available.
+        Url url("http://127.0.0.1:18123");
+
+        // Create a request to the first server.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        unsigned resp_num = 0;
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request1, response1,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Create a request with the second TLS context.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context2,
+                                                request2, response2,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+            if (++resp_num > 1) {
+                io_service_.stop();
+            }
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Record subject and issuer: they will be checked during response creation.
+        HttpRequest::recordSubject_ = true;
+        HttpRequest::recordIssuer_ = true;
+
+        // Actually trigger the requests.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure we have received two different responses.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+
+        EXPECT_NE(sequence1->intValue(), sequence2->intValue());
+    }
+
+    /// @brief Test that idle connection can be resumed for second request.
+    void testIdleConnection() {
+        // Start the server that has short idle timeout. It closes the idle
+        // connection after 200ms.
+        ASSERT_NO_THROW(listener3_->start());
+
+        // Create the client that will communicate with this server.
+        HttpClient client(io_service_);
+
+        // Specify the URL of this server.
+        Url url("http://127.0.0.1:18125");
+
+        // Create the first request.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request1, response1,
+            [this](const boost::system::error_code& ec, const HttpResponsePtr&,
+                   const std::string&) {
+            io_service_.stop();
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Run the IO service until the response is received.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure the response has been received.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+
+        // Delay the generation of the second request by 2x server idle timeout.
+        // This should be enough to cause the server to close the connection.
+        ASSERT_NO_THROW(runIOService(SHORT_IDLE_TIMEOUT * 2));
+
+        // Create another request.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request2, response2,
+            [this](const boost::system::error_code& ec, const HttpResponsePtr&,
+                   const std::string&) {
+            io_service_.stop();
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Actually trigger the second request.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sire that the server has responded.
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+
+        // Make sure that two different responses have been received.
+        EXPECT_NE(sequence1->intValue(), sequence2->intValue());
+    }
+
+    /// @brief This test verifies that the client returns IO error code when the
+    /// server is unreachable.
+    void testUnreachable () {
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL of the server. This server is down.
+        Url url("http://127.0.0.1:18123");
+
+        // Create the request.
+        PostHttpRequestJsonPtr request = createRequest("sequence", 1);
+        HttpResponseJsonPtr response(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request, response,
+            [this](const boost::system::error_code& ec,
+                   const HttpResponsePtr&,
+                   const std::string&) {
+            io_service_.stop();
+            // The server should have returned an IO error.
+            if (!ec) {
+                ADD_FAILURE() << "asyncSendRequest didn't fail";
+            }
+        }));
+
+        // Actually trigger the request.
+        ASSERT_NO_THROW(runIOService());
+    }
+
+    /// @brief Test that an error is returned by the client if the server
+    /// response is malformed.
+    void testMalformedResponse () {
+        // Start the server.
+        ASSERT_NO_THROW(listener_->start());
+
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL of the server.
+        Url url("http://127.0.0.1:18123");
+
+        // The response is going to be malformed in such a way that it holds
+        // an invalid content type. We affect the content type by creating
+        // a request that holds a JSON parameter requesting a specific
+        // content type.
+        PostHttpRequestJsonPtr request = createRequest("requested-content-type",
+                                                       "text/html");
+        HttpResponseJsonPtr response(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request, response,
+            [this](const boost::system::error_code& ec,
+                   const HttpResponsePtr& response,
+                   const std::string& parsing_error) {
+            io_service_.stop();
+            // There should be no IO error (answer from the server is received).
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+            // The response object is NULL because it couldn't be finalized.
+            EXPECT_FALSE(response);
+            // The message parsing error should be returned.
+            EXPECT_FALSE(parsing_error.empty());
+        }));
+
+        // Actually trigger the request.
+        ASSERT_NO_THROW(runIOService());
+    }
+
+    /// @brief Test that client times out when it doesn't receive the entire
+    /// response from the server within a desired time.
+    void testClientRequestTimeout() {
+        // Start the server.
+        ASSERT_NO_THROW(listener_->start());
+
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL of the server.
+        Url url("http://127.0.0.1:18123");
+
+        unsigned cb_num = 0;
+
+        // Create the request which asks the server to generate a partial
+        // (although well formed) response. The client will be waiting for the
+        // rest of the response to be provided and will eventually time out.
+        PostHttpRequestJsonPtr request1 = createRequest("partial-response", true);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        // This value will be set to true if the connection close callback is
+        // invoked upon time out.
+        auto connection_closed = false;
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request1, response1,
+            [this, &cb_num](const boost::system::error_code& ec,
+                            const HttpResponsePtr& response,
+                            const std::string&) {
+                if (++cb_num > 1) {
+                    io_service_.stop();
+                }
+                // In this particular case we know exactly the type of the
+                // IO error returned, because the client explicitly sets this
+                // error code.
+                EXPECT_TRUE(ec.value() == boost::asio::error::timed_out);
+                // There should be no response returned.
+                EXPECT_FALSE(response);
+            },
+            HttpClient::RequestTimeout(100),
+            HttpClient::ConnectHandler(),
+            HttpClient::HandshakeHandler(),
+            [&connection_closed](const int) {
+                // This callback is called when the connection gets closed
+                // by the client.
+                connection_closed = true;
+            })
+        );
+
+        // Create another request after the timeout. It should be handled ok.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 1);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request2, response2,
+            [this, &cb_num](const boost::system::error_code& /*ec*/,
+                            const HttpResponsePtr&,
+                            const std::string&) {
+                if (++cb_num > 1) {
+                    io_service_.stop();
+                }
+            }));
+
+        // Actually trigger the requests.
+        ASSERT_NO_THROW(runIOService());
+        // Make sure that the client has closed the connection upon timeout.
+        EXPECT_TRUE(connection_closed);
+    }
+
+    /// @brief Test that client times out when connection takes too long.
+    void testClientConnectTimeout() {
+        // Start the server.
+        ASSERT_NO_THROW(listener_->start());
+
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL of the server.
+        Url url("http://127.0.0.1:18123");
+
+        unsigned cb_num = 0;
+
+        PostHttpRequestJsonPtr request = createRequest("sequence", 1);
+        HttpResponseJsonPtr response(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request, response,
+            [this, &cb_num](const boost::system::error_code& ec,
+                            const HttpResponsePtr& response,
+                            const std::string&) {
+                if (++cb_num > 1) {
+                    io_service_.stop();
+                }
+                // In this particular case we know exactly the type of the
+                // IO error returned, because the client explicitly sets this
+                // error code.
+                EXPECT_TRUE(ec.value() == boost::asio::error::timed_out);
+                // There should be no response returned.
+                EXPECT_FALSE(response);
+            },
+            HttpClient::RequestTimeout(100),
+
+            // This callback is invoked upon an attempt to connect to the
+            // server. The false value indicates to the HttpClient to not
+            // try to send a request to the server. This simulates the
+            // case of connect() taking very long and should eventually
+            // cause the transaction to time out.
+            [](const boost::system::error_code& /*ec*/, int) {
+                return (false);
+            }));
+
+        // Create another request after the timeout. It should be handled ok.
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request, response,
+            [this, &cb_num](const boost::system::error_code& /*ec*/,
+                            const HttpResponsePtr&,
+                            const std::string&) {
+                if (++cb_num > 1) {
+                    io_service_.stop();
+                }
+            }));
+
+        // Actually trigger the requests.
+        ASSERT_NO_THROW(runIOService());
+    }
+
+    /// @brief Tests the behavior of the HTTP client when the premature
+    /// timeout occurs.
+    ///
+    /// The premature timeout may occur when the system clock is moved
+    /// during the transaction. This test simulates this behavior by
+    /// starting new transaction and waiting for the timeout to occur
+    /// before the IO service is ran. The timeout handler is invoked
+    /// first and it resets the transaction state. This test verifies
+    /// that the started transaction tears down gracefully after the
+    /// transaction state is reset.
+    ///
+    /// There are two variants of this test. The first variant schedules
+    /// one transaction before running the IO service. The second variant
+    /// schedules two transactions prior to running the IO service. The
+    /// second transaction is queued, so it is expected that it doesn't
+    /// time out and it runs successfully.
+    ///
+    /// @param queue_two_requests Boolean value indicating if a single
+    /// transaction should be queued (false), or two (true).
+    void testClientRequestLateStart(const bool queue_two_requests) {
+        // Start the server.
+        ASSERT_NO_THROW(listener_->start());
+
+        // Create the client.
+        HttpClient client(io_service_);
+
+        // Specify the URL of the server.
+        Url url("http://127.0.0.1:18123");
+
+        // Generate first request.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+
+        // Use very short timeout to make sure that it occurs before we actually
+        // run the transaction.
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request1, response1,
+            [](const boost::system::error_code& ec,
+               const HttpResponsePtr& response,
+               const std::string&) {
+
+            // In this particular case we know exactly the type of the
+            // IO error returned, because the client explicitly sets this
+            // error code.
+            EXPECT_TRUE(ec.value() == boost::asio::error::timed_out);
+            // There should be no response returned.
+            EXPECT_FALSE(response);
+        },
+        HttpClient::RequestTimeout(1)));
+
+        if (queue_two_requests) {
+            PostHttpRequestJsonPtr request2 = createRequest("sequence", 2);
+            HttpResponseJsonPtr response2(new HttpResponseJson());
+            ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                    request2, response2,
+                [](const boost::system::error_code& ec,
+                   const HttpResponsePtr& response,
+                   const std::string&) {
+
+                    // This second request should be successful.
+                    if (ec) {
+                        ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+                    }
+                    EXPECT_TRUE(response);
+            }));
+        }
+
+        // This waits for 3ms to make sure that the timeout occurs before we
+        // run the transaction. This leads to an unusual situation that the
+        // transaction state is reset as a result of the timeout but the
+        // transaction is alive. We want to make sure that the client can
+        // gracefully deal with this situation.
+        usleep(3000);
+
+        // Run the transaction and hope it will gracefully tear down.
+        ASSERT_NO_THROW(runIOService(100));
+
+        // Now try to send another request to make sure that the client
+        // is healthy.
+        PostHttpRequestJsonPtr request3 = createRequest("sequence", 3);
+        HttpResponseJsonPtr response3(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request3, response3,
+                         [this](const boost::system::error_code& ec,
+                                const HttpResponsePtr&,
+                                const std::string&) {
+            io_service_.stop();
+
+            // Everything should be ok.
+            if (ec) {
+                ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+            }
+        }));
+
+        // Actually trigger the requests.
+        ASSERT_NO_THROW(runIOService());
+    }
+
+    /// @brief Tests that underlying TCP socket can be registered and
+    /// unregistered via connection and close callbacks.
+    ///
+    /// It conducts to consecutive requests over the same client.
+    ///
+    /// @param version HTTP version to be used.
+    void testConnectCloseCallbacks(const HttpVersion& version) {
+        // Start the server.
+        ASSERT_NO_THROW(listener_->start());
+
+        // Create a client and specify the URL on which the server can be reached.
+        HttpClient client(io_service_);
+        Url url("http://127.0.0.1:18123");
+
+        // Initiate request to the server.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1, version);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        unsigned resp_num = 0;
+        ExternalMonitor monitor;
+
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request1, response1,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+                if (++resp_num > 1) {
+                    io_service_.stop();
+                }
+
+                if (ec) {
+                    ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+                }
+            },
+            HttpClient::RequestTimeout(10000),
+            std::bind(&ExternalMonitor::connectHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::handshakeHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::closeHandler, &monitor, ph::_1)
+        ));
+
+        // Initiate another request to the destination.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2, version);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request2, response2,
+            [this, &resp_num](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+                if (++resp_num > 1) {
+                    io_service_.stop();
+                }
+                if (ec) {
+                    ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+                }
+            },
+            HttpClient::RequestTimeout(10000),
+            std::bind(&ExternalMonitor::connectHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::handshakeHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::closeHandler, &monitor, ph::_1)
+        ));
+
+        // Actually trigger the requests. The requests should be handlded by the
+        // server one after another. While the first request is being processed
+        // the server should queue another one.
+        ASSERT_NO_THROW(runIOService());
+
+        // We should have had 2 connect invocations, no closes
+        // and a valid registered fd
+        EXPECT_EQ(2, monitor.connect_cnt_);
+        EXPECT_EQ(0, monitor.close_cnt_);
+        EXPECT_GT(monitor.registered_fd_, -1);
+
+        // Make sure that the received responses are different. We check that by
+        // comparing value of the sequence parameters.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+        EXPECT_NE(sequence1->intValue(), sequence2->intValue());
+
+        // Stopping the client the close the connection.
+        client.stop();
+
+        // We should have had 2 connect invocations, 1 closes
+        // and an invalid registered fd
+        EXPECT_EQ(2, monitor.connect_cnt_);
+        EXPECT_EQ(1, monitor.close_cnt_);
+        EXPECT_EQ(-1, monitor.registered_fd_);
+    }
+
+    /// @brief Tests detection and handling out-of-band socket events
+    ///
+    /// It initiates a transaction and verifies that a mid-transaction call
+    /// to HttpClient::closeIfOutOfBand() has no affect on the connection.
+    /// After successful completion of the transaction, a second call to
+    /// HttpClient::closeIfOutOfBand() is made. This should result in the
+    /// connection being closed.
+    /// This step is repeated to verify that after an OOB closure, transactions
+    /// to the same destination can be processed.
+    ///
+    /// Lastly, we verify that HttpClient::stop() closes the connection correctly.
+    ///
+    /// @param version HTTP version to be used.
+    void testCloseIfOutOfBand(const HttpVersion& version) {
+        // Start the server.
+        ASSERT_NO_THROW(listener_->start());
+
+        // Create a client and specify the URL on which the server can be reached.
+        HttpClient client(io_service_);
+        Url url("http://127.0.0.1:18123");
+
+        // Initiate request to the server.
+        PostHttpRequestJsonPtr request1 = createRequest("sequence", 1, version);
+        HttpResponseJsonPtr response1(new HttpResponseJson());
+        unsigned resp_num = 0;
+        ExternalMonitor monitor;
+
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request1, response1,
+            [this, &client, &resp_num, &monitor](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+                if (++resp_num == 1) {
+                    io_service_.stop();
+                }
+
+                // We should have 1 connect.
+                EXPECT_EQ(1, monitor.connect_cnt_);
+                // We should have 1 handshake.
+                EXPECT_EQ(1, monitor.handshake_cnt_);
+                // We should have 0 closes
+                EXPECT_EQ(0, monitor.close_cnt_);
+                // We should have a valid fd.
+                ASSERT_GT(monitor.registered_fd_, -1);
+                int orig_fd = monitor.registered_fd_;
+
+                // Test our socket for OOBness.
+                client.closeIfOutOfBand(monitor.registered_fd_);
+
+                // Since we're in a transaction, we should have no closes and
+                // the same valid fd.
+                EXPECT_EQ(0, monitor.close_cnt_);
+                ASSERT_EQ(monitor.registered_fd_, orig_fd);
+
+                if (ec) {
+                    ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+                }
+            },
+            HttpClient::RequestTimeout(10000),
+            std::bind(&ExternalMonitor::connectHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::handshakeHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::closeHandler, &monitor, ph::_1)
+        ));
+
+        // Actually trigger the requests. The requests should be handlded by the
+        // server one after another. While the first request is being processed
+        // the server should queue another one.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure that we received a response.
+        ASSERT_TRUE(response1);
+        ConstElementPtr sequence1 = response1->getJsonElement("sequence");
+        ASSERT_TRUE(sequence1);
+        EXPECT_EQ(1, sequence1->intValue());
+
+        // We should have had 1 connect invocations, no closes
+        // and a valid registered fd
+        EXPECT_EQ(1, monitor.connect_cnt_);
+        EXPECT_EQ(0, monitor.close_cnt_);
+        EXPECT_GT(monitor.registered_fd_, -1);
+
+        // Test our socket for OOBness.
+        client.closeIfOutOfBand(monitor.registered_fd_);
+
+        // Since we're in a transaction, we should have no closes and
+        // the same valid fd.
+        EXPECT_EQ(1, monitor.close_cnt_);
+        EXPECT_EQ(-1, monitor.registered_fd_);
+
+        // Now let's do another request to the destination to verify that
+        // we'll reopen the connection without issue.
+        PostHttpRequestJsonPtr request2 = createRequest("sequence", 2, version);
+        HttpResponseJsonPtr response2(new HttpResponseJson());
+        resp_num = 0;
+        ASSERT_NO_THROW(client.asyncSendRequest(url, client_context_,
+                                                request2, response2,
+            [this, &client, &resp_num, &monitor](const boost::system::error_code& ec,
+                              const HttpResponsePtr&,
+                              const std::string&) {
+                if (++resp_num == 1) {
+                    io_service_.stop();
+                }
+
+                // We should have 1 connect.
+                EXPECT_EQ(2, monitor.connect_cnt_);
+                // We should have 2 handshake.
+                EXPECT_EQ(2, monitor.handshake_cnt_);
+                // We should have 0 closes
+                EXPECT_EQ(1, monitor.close_cnt_);
+                // We should have a valid fd.
+                ASSERT_GT(monitor.registered_fd_, -1);
+                int orig_fd = monitor.registered_fd_;
+
+                // Test our socket for OOBness.
+                client.closeIfOutOfBand(monitor.registered_fd_);
+
+                // Since we're in a transaction, we should have no closes and
+                // the same valid fd.
+                EXPECT_EQ(1, monitor.close_cnt_);
+                ASSERT_EQ(monitor.registered_fd_, orig_fd);
+
+                if (ec) {
+                    ADD_FAILURE() << "asyncSendRequest failed: " << ec.message();
+                }
+            },
+            HttpClient::RequestTimeout(10000),
+            std::bind(&ExternalMonitor::connectHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::handshakeHandler, &monitor, ph::_1, ph::_2),
+            std::bind(&ExternalMonitor::closeHandler, &monitor, ph::_1)
+        ));
+
+        // Actually trigger the requests. The requests should be handlded by the
+        // server one after another. While the first request is being processed
+        // the server should queue another one.
+        ASSERT_NO_THROW(runIOService());
+
+        // Make sure that we received the second response.
+        ASSERT_TRUE(response2);
+        ConstElementPtr sequence2 = response2->getJsonElement("sequence");
+        ASSERT_TRUE(sequence2);
+        EXPECT_EQ(2, sequence2->intValue());
+
+        // Stopping the client the close the connection.
+        client.stop();
+
+        // We should have had 2 connect invocations, 2 closes
+        // and an invalid registered fd
+        EXPECT_EQ(2, monitor.connect_cnt_);
+        EXPECT_EQ(2, monitor.close_cnt_);
+        EXPECT_EQ(-1, monitor.registered_fd_);
+    }
+
+    /// @brief Simulates external registry of Connection TCP sockets
+    ///
+    /// Provides methods compatible with Connection callbacks for connect
+    /// and close operations.
+    class ExternalMonitor {
+    public:
+        /// @brief Constructor
+        ExternalMonitor()
+            : registered_fd_(-1), connect_cnt_(0), handshake_cnt_(0),
+              close_cnt_(0) {
+        }
+
+        /// @brief Connect callback handler
+        /// @param ec Error status of the ASIO connect
+        /// @param tcp_native_fd socket descriptor to register
+        bool connectHandler(const boost::system::error_code& ec, int tcp_native_fd) {
+            ++connect_cnt_;
+            if ((!ec || (ec.value() == boost::asio::error::in_progress))
+                && (tcp_native_fd >= 0)) {
+                registered_fd_ = tcp_native_fd;
+                return (true);
+            } else if ((ec.value() == boost::asio::error::already_connected)
+                       && (registered_fd_ != tcp_native_fd)) {
+                return (false);
+            }
+
+            // ec indicates an error, return true, so that error can be handled
+            // by Connection logic.
+            return (true);
+        }
+
+        /// @brief Handshake callback handler
+        /// @param ec Error status of the ASIO connect
+        bool handshakeHandler(const boost::system::error_code&, int) {
+            ++handshake_cnt_;
+            // ec indicates an error, return true, so that error can be handled
+            // by Connection logic.
+            return (true);
+        }
+
+        /// @brief Close callback handler
+        ///
+        /// @param tcp_native_fd socket descriptor to register
+        void closeHandler(int tcp_native_fd) {
+            ++close_cnt_;
+            EXPECT_EQ(tcp_native_fd, registered_fd_) << "closeHandler fd mismatch";
+            if (tcp_native_fd >= 0) {
+                registered_fd_ = -1;
+            }
+        }
+
+        /// @brief Keeps track of socket currently "registered" for external monitoring.
+        int registered_fd_;
+
+        /// @brief Tracks how many times the connect callback is invoked.
+        int connect_cnt_;
+
+        /// @brief Tracks how many times the handshake callback is invoked.
+        int handshake_cnt_;
+
+        /// @brief Tracks how many times the close callback is invoked.
+        int close_cnt_;
+    };
+
+    /// @brief Instance of the listener used in the tests.
+    std::unique_ptr<HttpListener> listener_;
+
+    /// @brief Instance of the second listener used in the tests.
+    std::unique_ptr<HttpListener> listener2_;
+
+    /// @brief Instance of the third listener used in the tests (with short idle
+    /// timeout).
+    std::unique_ptr<HttpListener> listener3_;
+
+    /// @brief Server TLS context.
+    TlsContextPtr server_context_;
+
+    /// @brief Client TLS context.
+    TlsContextPtr client_context_;
+};
+
+#ifndef DISABLE_SOME_TESTS
+// Test that two consecutive requests can be sent over the same (persistent)
+// connection.
+TEST_F(HttpsClientTest, consecutiveRequests) {
+
+    ASSERT_NO_FATAL_FAILURE(testConsecutiveRequests(HttpVersion(1, 1)));
+}
+
+// Test that two consecutive requests can be sent over the same (persistent)
+// connection.
+TEST_F(HttpsClientTest, consecutiveRequestsMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+
+    ASSERT_NO_FATAL_FAILURE(testConsecutiveRequests(HttpVersion(1, 1)));
+}
+#endif
+
+// Test that two consecutive requests can be sent over non-persistent connection.
+// This is achieved by sending HTTP/1.0 requests, which are non-persistent by
+// default. The client should close the connection right after receiving a response
+// from the server.
+TEST_F(HttpsClientTest, closeBetweenRequests) {
+    ASSERT_NO_FATAL_FAILURE(testConsecutiveRequests(HttpVersion(1, 0)));
+}
+
+// Test that two consecutive requests can be sent over non-persistent connection.
+// This is achieved by sending HTTP/1.0 requests, which are non-persistent by
+// default. The client should close the connection right after receiving a response
+// from the server.
+TEST_F(HttpsClientTest, closeBetweenRequestsMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testConsecutiveRequests(HttpVersion(1, 0)));
+}
+
+// Test that the client can communicate with two different destinations
+// simultaneously.
+TEST_F(HttpsClientTest, multipleDestinations) {
+    ASSERT_NO_FATAL_FAILURE(testMultipleDestinations());
+}
+
+// Test that the client can communicate with two different destinations
+// simultaneously.
+TEST_F(HttpsClientTest, multipleDestinationsMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testMultipleDestinations());
+}
+
+// Test that the client can use two different TLS contexts to the same
+// destination address and port simultaneously.
+TEST_F(HttpsClientTest, multipleTlsContexts) {
+    ASSERT_NO_FATAL_FAILURE(testMultipleTlsContexts());
+}
+
+// Test that the client can use two different TLS contexts to the same
+// destination address and port simultaneously.
+TEST_F(HttpsClientTest, multipleTlsContextsMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testMultipleTlsContexts());
+}
+
+// Test that idle connection can be resumed for second request.
+TEST_F(HttpsClientTest, idleConnection) {
+    ASSERT_NO_FATAL_FAILURE(testIdleConnection());
+}
+
+// Test that idle connection can be resumed for second request.
+TEST_F(HttpsClientTest, idleConnectionMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testIdleConnection());
+}
+
+// This test verifies that the client returns IO error code when the
+// server is unreachable.
+TEST_F(HttpsClientTest, unreachable) {
+    ASSERT_NO_FATAL_FAILURE(testUnreachable());
+}
+
+// This test verifies that the client returns IO error code when the
+// server is unreachable.
+TEST_F(HttpsClientTest, unreachableMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testUnreachable());
+}
+
+// Test that an error is returned by the client if the server response is
+// malformed.
+TEST_F(HttpsClientTest, malformedResponse) {
+    ASSERT_NO_FATAL_FAILURE(testMalformedResponse());
+}
+
+// Test that an error is returned by the client if the server response is
+// malformed.
+TEST_F(HttpsClientTest, malformedResponseMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testMalformedResponse());
+}
+
+// Test that client times out when it doesn't receive the entire response
+// from the server within a desired time.
+TEST_F(HttpsClientTest, clientRequestTimeout) {
+    ASSERT_NO_FATAL_FAILURE(testClientRequestTimeout());
+}
+
+// Test that client times out when it doesn't receive the entire response
+// from the server within a desired time.
+TEST_F(HttpsClientTest, clientRequestTimeoutMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testClientRequestTimeout());
+}
+
+// This test verifies the behavior of the HTTP client when the premature
+// (and unexpected) timeout occurs. The premature timeout may be caused
+// by the system clock move.
+TEST_F(HttpsClientTest, DISABLED_clientRequestLateStartNoQueue) {
+    testClientRequestLateStart(false);
+}
+
+// This test verifies the behavior of the HTTP client when the premature
+// (and unexpected) timeout occurs. The premature timeout may be caused
+// by the system clock move.
+TEST_F(HttpsClientTest, DISABLED_clientRequestLateStartNoQueueMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    testClientRequestLateStart(false);
+}
+
+#ifndef DISABLE_SOME_TESTS
+// This test verifies the behavior of the HTTP client when the premature
+// timeout occurs and there are requests queued after the request which
+// times out.
+TEST_F(HttpsClientTest, clientRequestLateStartQueue) {
+
+    testClientRequestLateStart(true);
+}
+
+// This test verifies the behavior of the HTTP client when the premature
+// timeout occurs and there are requests queued after the request which
+// times out.
+TEST_F(HttpsClientTest, clientRequestLateStartQueueMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    testClientRequestLateStart(true);
+}
+#endif
+
+// Test that client times out when connection takes too long.
+TEST_F(HttpsClientTest, clientConnectTimeout) {
+    ASSERT_NO_FATAL_FAILURE(testClientConnectTimeout());
+}
+
+// Test that client times out when connection takes too long.
+TEST_F(HttpsClientTest, clientConnectTimeoutMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testClientConnectTimeout());
+}
+
+#ifndef DISABLE_SOME_TESTS
+/// Tests that connect and close callbacks work correctly.
+TEST_F(HttpsClientTest, connectCloseCallbacks) {
+    ASSERT_NO_FATAL_FAILURE(testConnectCloseCallbacks(HttpVersion(1, 1)));
+}
+
+/// Tests that connect and close callbacks work correctly.
+TEST_F(HttpsClientTest, connectCloseCallbacksMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testConnectCloseCallbacks(HttpVersion(1, 1)));
+}
+#endif
+
+/// Tests that HttpClient::closeIfOutOfBand works correctly.
+TEST_F(HttpsClientTest, closeIfOutOfBand) {
+    ASSERT_NO_FATAL_FAILURE(testCloseIfOutOfBand(HttpVersion(1, 1)));
+}
+
+/// Tests that HttpClient::closeIfOutOfBand works correctly.
+TEST_F(HttpsClientTest, closeIfOutOfBandMultiThreading) {
+    MultiThreadingMgr::instance().setMode(true);
+    ASSERT_NO_FATAL_FAILURE(testCloseIfOutOfBand(HttpVersion(1, 1)));
+}
+
+}
diff --git a/src/lib/http/tests/tls_server_unittests.cc b/src/lib/http/tests/tls_server_unittests.cc
new file mode 100644
index 0000000..a2a6f9d
--- /dev/null
+++ b/src/lib/http/tests/tls_server_unittests.cc
@@ -0,0 +1,1253 @@
+// Copyright (C) 2017-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/interval_timer.h>
+#include <asiolink/tls_acceptor.h>
+#include <asiolink/testutils/test_tls.h>
+#include <cc/data.h>
+#include <http/client.h>
+#include <http/http_types.h>
+#include <http/listener.h>
+#include <http/listener_impl.h>
+#include <http/post_request_json.h>
+#include <http/response_creator.h>
+#include <http/response_creator_factory.h>
+#include <http/response_json.h>
+#include <http/tests/response_test.h>
+#include <http/url.h>
+#include <util/multi_threading_mgr.h>
+
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/ip/tcp.hpp>
+#include <boost/pointer_cast.hpp>
+#include <gtest/gtest.h>
+
+#include <functional>
+#include <list>
+#include <sstream>
+#include <string>
+
+using namespace boost::asio;
+using namespace boost::asio::ip;
+using namespace isc::asiolink;
+using namespace isc::asiolink::test;
+using namespace isc::data;
+using namespace isc::http;
+using namespace isc::http::test;
+using namespace isc::util;
+namespace ph = std::placeholders;
+
+/// @todo: put the common part of client and server tests in its own file(s).
+
+namespace {
+
+/// @brief IP address to which HTTP service is bound.
+const std::string SERVER_ADDRESS = "127.0.0.1";
+
+/// @brief IPv6 address to whch HTTP service is bound.
+const std::string IPV6_SERVER_ADDRESS = "::1";
+
+/// @brief Port number to which HTTP service is bound.
+const unsigned short SERVER_PORT = 18123;
+
+/// @brief Request Timeout used in most of the tests (ms).
+const long REQUEST_TIMEOUT = 10000;
+
+/// @brief Persistent connection idle timeout used in most of the tests (ms).
+const long IDLE_TIMEOUT = 10000;
+
+/// @brief Persistent connection idle timeout used in tests where idle connections
+/// are tested (ms).
+const long SHORT_IDLE_TIMEOUT = 200;
+
+/// @brief Test timeout (ms).
+const long TEST_TIMEOUT = 10000;
+
+/// @brief Test HTTP response.
+typedef TestHttpResponseBase<HttpResponseJson> Response;
+
+/// @brief Pointer to test HTTP response.
+typedef boost::shared_ptr<Response> ResponsePtr;
+
+/// @brief Generic test HTTP response.
+typedef TestHttpResponseBase<HttpResponse> GenericResponse;
+
+/// @brief Pointer to generic test HTTP response.
+typedef boost::shared_ptr<GenericResponse> GenericResponsePtr;
+
+/// @brief Implementation of the @ref HttpResponseCreator.
+class TestHttpResponseCreator : public HttpResponseCreator {
+public:
+
+    /// @brief Create a new request.
+    ///
+    /// @return Pointer to the new instance of the @ref HttpRequest.
+    virtual HttpRequestPtr
+    createNewHttpRequest() const {
+        return (HttpRequestPtr(new PostHttpRequestJson()));
+    }
+
+private:
+
+    /// @brief Creates HTTP response.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP response.
+    virtual HttpResponsePtr
+    createStockHttpResponse(const HttpRequestPtr& request,
+                            const HttpStatusCode& status_code) const {
+        // The request hasn't been finalized so the request object
+        // doesn't contain any information about the HTTP version number
+        // used. But, the context should have this data (assuming the
+        // HTTP version is parsed ok).
+        HttpVersion http_version(request->context()->http_version_major_,
+                                 request->context()->http_version_minor_);
+        // This will generate the response holding JSON content.
+        ResponsePtr response(new Response(http_version, status_code));
+        response->finalize();
+        return (response);
+    }
+
+    /// @brief Creates HTTP response.
+    ///
+    /// This method generates 3 types of responses:
+    /// - response with a requested content type,
+    /// - partial response with incomplete JSON body,
+    /// - response with JSON body copied from the request.
+    ///
+    /// The first one is useful to test situations when received response can't
+    /// be parsed because of the content type mismatch. The second one is useful
+    /// to test request timeouts. The third type is used by most of the unit tests
+    /// to test successful transactions.
+    ///
+    /// @param request Pointer to the HTTP request.
+    /// @return Pointer to the generated HTTP OK response with no content.
+    virtual HttpResponsePtr
+    createDynamicHttpResponse(HttpRequestPtr request) {
+        // Request must always be JSON.
+        PostHttpRequestJsonPtr request_json =
+            boost::dynamic_pointer_cast<PostHttpRequestJson>(request);
+        ConstElementPtr body;
+        if (request_json) {
+            body = request_json->getBodyAsJson();
+            if (body) {
+                // Check if the client requested one of the two first response
+                // types.
+                GenericResponsePtr response;
+                ConstElementPtr content_type = body->get("requested-content-type");
+                ConstElementPtr partial_response = body->get("partial-response");
+                if (content_type || partial_response) {
+                    // The first two response types can only be generated using the
+                    // generic response as we have to explicitly modify some of the
+                    // values.
+                    response.reset(new GenericResponse(request->getHttpVersion(),
+                                                       HttpStatusCode::OK));
+                    HttpResponseContextPtr ctx = response->context();
+
+                    if (content_type) {
+                        // Provide requested content type.
+                        ctx->headers_.push_back(HttpHeaderContext("Content-Type",
+                                                                  content_type->stringValue()));
+                        // It doesn't matter what body is there.
+                        ctx->body_ = "abcd";
+                        response->finalize();
+
+                    } else {
+                        // Generate JSON response.
+                        ctx->headers_.push_back(HttpHeaderContext("Content-Type",
+                                                                  "application/json"));
+                        // The body lacks '}' so the client will be waiting for it and
+                        // eventually should time out.
+                        ctx->body_ = "{";
+                        response->finalize();
+                        // The auto generated Content-Length header would be based on the
+                        // body size (so set to 1 byte). We have to override it to
+                        // account for the missing '}' character.
+                        response->setContentLength(2);
+                    }
+                    return (response);
+                }
+            }
+        }
+
+        // Third type of response is requested.
+        ResponsePtr response(new Response(request->getHttpVersion(),
+                                          HttpStatusCode::OK));
+        // If body was included in the request. Let's copy it.
+        if (body) {
+            response->setBodyAsJson(body);
+        }
+
+        response->finalize();
+        return (response);
+    }
+};
+
+/// @brief Implementation of the test @ref HttpResponseCreatorFactory.
+///
+/// This factory class creates @ref TestHttpResponseCreator instances.
+class TestHttpResponseCreatorFactory : public HttpResponseCreatorFactory {
+public:
+
+    /// @brief Creates @ref TestHttpResponseCreator instance.
+    virtual HttpResponseCreatorPtr create() const {
+        HttpResponseCreatorPtr response_creator(new TestHttpResponseCreator());
+        return (response_creator);
+    }
+};
+
+/// @brief Implementation of the HTTP listener used in tests.
+///
+/// This implementation replaces the @c HttpConnection type with a custom
+/// implementation.
+///
+/// @tparam HttpConnectionType Type of the connection object to be used by
+/// the listener implementation.
+template<typename HttpConnectionType>
+class HttpListenerImplCustom : public HttpListenerImpl {
+public:
+
+    HttpListenerImplCustom(IOService& io_service,
+                           const IOAddress& server_address,
+                           const unsigned short server_port,
+                           const TlsContextPtr& tls_context,
+                           const HttpResponseCreatorFactoryPtr& creator_factory,
+                           const long request_timeout,
+                           const long idle_timeout)
+        : HttpListenerImpl(io_service, server_address, server_port,
+                           tls_context, creator_factory, request_timeout,
+                           idle_timeout) {
+    }
+
+protected:
+
+    /// @brief Creates an instance of the @c HttpConnection.
+    ///
+    /// This method is virtual so as it can be overridden when customized
+    /// connections are to be used, e.g. in case of unit testing.
+    ///
+    /// @param response_creator Pointer to the response creator object used to
+    /// create HTTP response from the HTTP request received.
+    /// @param callback Callback invoked when new connection is accepted.
+    ///
+    /// @return Pointer to the created connection.
+    virtual HttpConnectionPtr createConnection(const HttpResponseCreatorPtr& response_creator,
+                                               const HttpAcceptorCallback& callback) {
+        TlsContextPtr tls_context;
+        configClient(tls_context);
+        HttpConnectionPtr
+            conn(new HttpConnectionType(io_service_, acceptor_,
+                                        tls_context_, connections_,
+                                        response_creator, callback,
+                                        request_timeout_, idle_timeout_));
+        return (conn);
+    }
+};
+
+/// @brief Derivation of the @c HttpListener used in tests.
+///
+/// This class replaces the default implementation instance with the
+/// @c HttpListenerImplCustom using the customized connection type.
+///
+/// @tparam HttpConnectionType Type of the connection object to be used by
+/// the listener implementation.
+template<typename HttpConnectionType>
+class HttpListenerCustom : public HttpListener {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param io_service IO service to be used by the listener.
+    /// @param server_address Address on which the HTTP service should run.
+    /// @param server_port Port number on which the HTTP service should run.
+    /// @param tls_context TLS context.
+    /// @param creator_factory Pointer to the caller-defined
+    /// @ref HttpResponseCreatorFactory derivation which should be used to
+    /// create @ref HttpResponseCreator instances.
+    /// @param request_timeout Timeout after which the HTTP Request Timeout
+    /// is generated.
+    /// @param idle_timeout Timeout after which an idle persistent HTTP
+    /// connection is closed by the server.
+    ///
+    /// @throw HttpListenerError when any of the specified parameters is
+    /// invalid.
+    HttpListenerCustom(IOService& io_service,
+                       const IOAddress& server_address,
+                       const unsigned short server_port,
+                       const TlsContextPtr& tls_context,
+                       const HttpResponseCreatorFactoryPtr& creator_factory,
+                       const HttpListener::RequestTimeout& request_timeout,
+                       const HttpListener::IdleTimeout& idle_timeout)
+        : HttpListener(io_service, server_address, server_port,
+                       tls_context, creator_factory,
+                       request_timeout, idle_timeout) {
+        // Replace the default implementation with the customized version
+        // using the custom derivation of the HttpConnection.
+        impl_.reset(new HttpListenerImplCustom<HttpConnectionType>
+                    (io_service, server_address, server_port,
+                     tls_context, creator_factory, request_timeout.value_,
+                     idle_timeout.value_));
+    }
+};
+
+/// @brief Implementation of the @c HttpConnection which injects greater
+/// length value than the buffer size into the write socket callback.
+class HttpConnectionLongWriteBuffer : public HttpConnection {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param io_service IO service to be used by the connection.
+    /// @param acceptor Pointer to the TCP acceptor object used to listen for
+    /// new HTTP connections.
+    /// @param tls_context TLS context.
+    /// @param connection_pool Connection pool in which this connection is
+    /// stored.
+    /// @param response_creator Pointer to the response creator object used to
+    /// create HTTP response from the HTTP request received.
+    /// @param callback Callback invoked when new connection is accepted.
+    /// @param request_timeout Configured timeout for a HTTP request.
+    /// @param idle_timeout Timeout after which persistent HTTP connection is
+    /// closed by the server.
+    HttpConnectionLongWriteBuffer(IOService& io_service,
+                                  const HttpAcceptorPtr& acceptor,
+                                  const TlsContextPtr& tls_context,
+                                  HttpConnectionPool& connection_pool,
+                                  const HttpResponseCreatorPtr& response_creator,
+                                  const HttpAcceptorCallback& callback,
+                                  const long request_timeout,
+                                  const long idle_timeout)
+        : HttpConnection(io_service, acceptor, tls_context, connection_pool,
+                         response_creator, callback, request_timeout,
+                         idle_timeout) {
+    }
+
+    /// @brief Callback invoked when data is sent over the socket.
+    ///
+    /// @param transaction Pointer to the transaction for which the callback
+    /// is invoked.
+    /// @param ec Error code.
+    /// @param length Length of the data sent.
+    virtual void socketWriteCallback(HttpConnection::TransactionPtr transaction,
+                                     boost::system::error_code ec,
+                                     size_t length) {
+        // Pass greater length of the data written. The callback should deal
+        // with this and adjust the data length.
+        HttpConnection::socketWriteCallback(transaction, ec, length + 1);
+    }
+};
+
+/// @brief Implementation of the @c HttpConnection which replaces
+/// transaction instance prior to calling write socket callback.
+class HttpConnectionTransactionChange : public HttpConnection {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param io_service IO service to be used by the connection.
+    /// @param acceptor Pointer to the TCP acceptor object used to listen for
+    /// new HTTP connections.
+    /// @param tls_context TLS context.
+    /// @param connection_pool Connection pool in which this connection is
+    /// stored.
+    /// @param response_creator Pointer to the response creator object used to
+    /// create HTTP response from the HTTP request received.
+    /// @param callback Callback invoked when new connection is accepted.
+    /// @param request_timeout Configured timeout for a HTTP request.
+    /// @param idle_timeout Timeout after which persistent HTTP connection is
+    /// closed by the server.
+    HttpConnectionTransactionChange(IOService& io_service,
+                                    const HttpAcceptorPtr& acceptor,
+                                    const TlsContextPtr& tls_context,
+                                    HttpConnectionPool& connection_pool,
+                                    const HttpResponseCreatorPtr& response_creator,
+                                    const HttpAcceptorCallback& callback,
+                                    const long request_timeout,
+                                    const long idle_timeout)
+        : HttpConnection(io_service, acceptor, tls_context, connection_pool,
+                         response_creator, callback, request_timeout,
+                         idle_timeout) {
+    }
+
+    /// @brief Callback invoked when data is sent over the socket.
+    ///
+    /// @param transaction Pointer to the transaction for which the callback
+    /// is invoked.
+    /// @param ec Error code.
+    /// @param length Length of the data sent.
+    virtual void socketWriteCallback(HttpConnection::TransactionPtr transaction,
+                                     boost::system::error_code ec,
+                                     size_t length) {
+        // Replace the transaction. The socket callback should deal with this
+        // gracefully. It should detect that the output buffer is empty. Then
+        // try to see if the connection is persistent. This check should fail,
+        // because the request hasn't been created/finalized. The exception
+        // thrown upon checking the persistence should be caught and the
+        // connection closed.
+        transaction = HttpConnection::Transaction::create(response_creator_);
+        HttpConnection::socketWriteCallback(transaction, ec, length);
+    }
+};
+
+
+/// @brief Entity which can connect to the HTTP server endpoint.
+class TestHttpClient : public boost::noncopyable {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// This constructor creates new socket instance. It doesn't connect. Call
+    /// connect() to connect to the server.
+    ///
+    /// @param io_service IO service to be stopped on error.
+    /// @param tls_context TLS context.
+    TestHttpClient(IOService& io_service, TlsContextPtr tls_context)
+        : io_service_(io_service.get_io_service()),
+          stream_(io_service_, tls_context->getContext()),
+          buf_(), response_() {
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Closes the underlying socket if it is open.
+    ~TestHttpClient() {
+        close();
+    }
+
+    /// @brief Send HTTP request specified in textual format.
+    ///
+    /// @param request HTTP request in the textual format.
+    void startRequest(const std::string& request) {
+        tcp::endpoint endpoint(address::from_string(SERVER_ADDRESS),
+                               SERVER_PORT);
+        stream_.lowest_layer().async_connect(endpoint,
+        [this, request](const boost::system::error_code& ec) {
+            if (ec) {
+                // One would expect that async_connect wouldn't return
+                // EINPROGRESS error code, but simply wait for the connection
+                // to get established before the handler is invoked. It turns out,
+                // however, that on some OSes the connect handler may receive this
+                // error code which doesn't necessarily indicate a problem.
+                // Making an attempt to write and read from this socket will
+                // typically succeed. So, we ignore this error.
+                if (ec.value() != boost::asio::error::in_progress) {
+                    ADD_FAILURE() << "error occurred while connecting: "
+                                  << ec.message();
+                    io_service_.stop();
+                    return;
+                }
+            }
+            stream_.async_handshake(roleToImpl(TlsRole::CLIENT),
+            [this, request](const boost::system::error_code& ec) {
+                if (ec) {
+                    ADD_FAILURE() << "error occurred during handshake: "
+                                  << ec.message();
+                    io_service_.stop();
+                    return;
+                }
+                sendRequest(request);
+            });
+        });
+    }
+
+    /// @brief Send HTTP request.
+    ///
+    /// @param request HTTP request in the textual format.
+    void sendRequest(const std::string& request) {
+        sendPartialRequest(request);
+    }
+
+    /// @brief Send part of the HTTP request.
+    ///
+    /// @param request part of the HTTP request to be sent.
+    void sendPartialRequest(std::string request) {
+        boost::asio::async_write(stream_,
+                boost::asio::buffer(request.data(), request.size()),
+                [this, request](const boost::system::error_code& ec,
+                                std::size_t bytes_transferred) mutable {
+            if (ec) {
+                if (ec.value() == boost::asio::error::operation_aborted) {
+                    return;
+
+                } else if ((ec.value() == boost::asio::error::try_again) ||
+                           (ec.value() == boost::asio::error::would_block)) {
+                    // If we should try again make sure there is no garbage in the
+                    // bytes_transferred.
+                    bytes_transferred = 0;
+
+                } else {
+                    ADD_FAILURE() << "error occurred while connecting: "
+                                  << ec.message();
+                    io_service_.stop();
+                    return;
+                }
+            }
+
+            // Remove the part of the request which has been sent.
+            if (bytes_transferred > 0 && (request.size() <= bytes_transferred)) {
+                request.erase(0, bytes_transferred);
+            }
+
+            // Continue sending request data if there are still some data to be
+            // sent.
+            if (!request.empty()) {
+                sendPartialRequest(request);
+
+            } else {
+                // Request has been sent. Start receiving response.
+                response_.clear();
+                receivePartialResponse();
+            }
+       });
+    }
+
+    /// @brief Receive response from the server.
+    void receivePartialResponse() {
+        stream_.async_read_some(boost::asio::buffer(buf_.data(), buf_.size()),
+                                [this](const boost::system::error_code& ec,
+                                       std::size_t bytes_transferred) {
+            if (ec) {
+                // IO service stopped so simply return.
+                if (ec.value() == boost::asio::error::operation_aborted) {
+                    return;
+
+                } else if ((ec.value() == boost::asio::error::try_again) ||
+                           (ec.value() == boost::asio::error::would_block)) {
+                    // If we should try again, make sure that there is no garbage
+                    // in the bytes_transferred.
+                    bytes_transferred = 0;
+
+                } else {
+                    // Error occurred, bail...
+                    ADD_FAILURE() << "error occurred while receiving HTTP"
+                        " response from the server: " << ec.message();
+                    io_service_.stop();
+                }
+            }
+
+            if (bytes_transferred > 0) {
+                response_.insert(response_.end(), buf_.data(),
+                                 buf_.data() + bytes_transferred);
+            }
+
+            // Two consecutive new lines end the part of the response we're
+            // expecting.
+            if (response_.find("\r\n\r\n", 0) != std::string::npos) {
+                io_service_.stop();
+
+            } else {
+                receivePartialResponse();
+            }
+
+        });
+    }
+
+    /// @brief Checks if the TCP connection is still open.
+    ///
+    /// Tests the TCP connection by trying to read from the socket.
+    /// Unfortunately expected failure depends on a race between the read
+    /// and the other side close so to check if the connection is closed
+    /// please use @c isConnectionClosed instead.
+    ///
+    /// @return true if the TCP connection is open.
+    bool isConnectionAlive() {
+        // Remember the current non blocking setting.
+        const bool non_blocking_orig = stream_.lowest_layer().non_blocking();
+        // Set the socket to non blocking mode. We're going to test if the socket
+        // returns would_block status on the attempt to read from it.
+        stream_.lowest_layer().non_blocking(true);
+
+        // We need to provide a buffer for a call to read.
+        char data[2];
+        boost::system::error_code ec;
+        boost::asio::read(stream_, boost::asio::buffer(data, sizeof(data)), ec);
+
+        // Revert the original non_blocking flag on the socket.
+        stream_.lowest_layer().non_blocking(non_blocking_orig);
+
+        // If the connection is alive we'd typically get would_block status code.
+        // If there are any data that haven't been read we may also get success
+        // status. We're guessing that try_again may also be returned by some
+        // implementations in some situations. Any other error code indicates a
+        // problem with the connection so we assume that the connection has been
+        // closed.
+        return (!ec || (ec.value() == boost::asio::error::try_again) ||
+                (ec.value() == boost::asio::error::would_block));
+    }
+
+    /// @brief Checks if the TCP connection is already closed.
+    ///
+    /// Tests the TCP connection by trying to read from the socket.
+    /// The read can block so this must be used to check if a connection
+    /// is alive so to check if the connection is alive please always
+    /// use @c isConnectionAlive.
+    ///
+    /// @return true if the TCP connection is closed.
+    bool isConnectionClosed() {
+        // Remember the current non blocking setting.
+        const bool non_blocking_orig = stream_.lowest_layer().non_blocking();
+        // Set the socket to blocking mode. We're going to test if the socket
+        // returns eof status on the attempt to read from it.
+        stream_.lowest_layer().non_blocking(false);
+
+        // We need to provide a buffer for a call to read.
+        char data[2];
+        boost::system::error_code ec;
+        boost::asio::read(stream_, boost::asio::buffer(data, sizeof(data)), ec);
+
+        // Revert the original non_blocking flag on the socket.
+        stream_.lowest_layer().non_blocking(non_blocking_orig);
+
+        // If the connection is closed we'd typically get eof or
+        // stream_truncated status code.
+        return ((ec.value() == boost::asio::error::eof) ||
+                (ec.value() == STREAM_TRUNCATED));
+    }
+
+    /// @brief Close connection.
+    void close() {
+        stream_.lowest_layer().close();
+    }
+
+    std::string getResponse() const {
+        return (response_);
+    }
+
+private:
+
+    /// @brief Holds reference to the IO service.
+    boost::asio::io_service& io_service_;
+
+    /// @brief A socket used for the connection.
+    TlsStreamImpl stream_;
+
+    /// @brief Buffer into which response is written.
+    std::array<char, 8192> buf_;
+
+    /// @brief Response in the textual format.
+    std::string response_;
+};
+
+/// @brief Pointer to the TestHttpClient.
+typedef boost::shared_ptr<TestHttpClient> TestHttpClientPtr;
+
+/// @brief Test fixture class for @ref HttpListener.
+class HttpsListenerTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// Starts test timer which detects timeouts.
+    HttpsListenerTest()
+        : io_service_(), factory_(new TestHttpResponseCreatorFactory()),
+          test_timer_(io_service_), run_io_service_timer_(io_service_),
+          clients_(), server_context_(), client_context_() {
+        configServer(server_context_);
+        configClient(client_context_);
+        test_timer_.setup(std::bind(&HttpsListenerTest::timeoutHandler, this, true),
+                          TEST_TIMEOUT, IntervalTimer::ONE_SHOT);
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Removes active HTTP clients.
+    virtual ~HttpsListenerTest() {
+        for (auto client = clients_.begin(); client != clients_.end();
+             ++client) {
+            (*client)->close();
+        }
+    }
+
+    /// @brief Connect to the endpoint.
+    ///
+    /// This method creates TestHttpClient instance and retains it in the clients_
+    /// list.
+    ///
+    /// @param request String containing the HTTP request to be sent.
+    void startRequest(const std::string& request) {
+        TestHttpClientPtr client(new TestHttpClient(io_service_,
+                                                    client_context_));
+        clients_.push_back(client);
+        clients_.back()->startRequest(request);
+    }
+
+    /// @brief Callback function invoke upon test timeout.
+    ///
+    /// It stops the IO service and reports test timeout.
+    ///
+    /// @param fail_on_timeout Specifies if test failure should be reported.
+    void timeoutHandler(const bool fail_on_timeout) {
+        if (fail_on_timeout) {
+            ADD_FAILURE() << "Timeout occurred while running the test!";
+        }
+        io_service_.stop();
+    }
+
+    /// @brief Runs IO service with optional timeout.
+    ///
+    /// @param timeout Optional value specifying for how long the io service
+    /// should be ran.
+    void runIOService(long timeout = 0) {
+        io_service_.get_io_service().reset();
+
+        if (timeout > 0) {
+            run_io_service_timer_.setup(std::bind(&HttpsListenerTest::timeoutHandler,
+                                                  this, false),
+                                        timeout, IntervalTimer::ONE_SHOT);
+        }
+        io_service_.run();
+        io_service_.get_io_service().reset();
+        io_service_.poll();
+    }
+
+    /// @brief Returns HTTP OK response expected by unit tests.
+    ///
+    /// @param http_version HTTP version.
+    ///
+    /// @return HTTP OK response expected by unit tests.
+    std::string httpOk(const HttpVersion& http_version) {
+        std::ostringstream s;
+        s << "HTTP/" << http_version.major_ << "." << http_version.minor_ << " 200 OK\r\n"
+            "Content-Length: 33\r\n"
+            "Content-Type: application/json\r\n"
+            "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+            "\r\n"
+            "{ \"remote-address\": \"127.0.0.1\" }";
+        return (s.str());
+    }
+
+    /// @brief Tests that HTTP request timeout status is returned when the
+    /// server does not receive the entire request.
+    ///
+    /// @param request Partial request for which the parser will be waiting for
+    /// the next chunks of data.
+    /// @param expected_version HTTP version expected in the response.
+    void testRequestTimeout(const std::string& request,
+                            const HttpVersion& expected_version) {
+        // Open the listener with the Request Timeout of 1 sec and post the
+        // partial request.
+        HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS),
+                              SERVER_PORT, server_context_,
+                              factory_, HttpListener::RequestTimeout(1000),
+                              HttpListener::IdleTimeout(IDLE_TIMEOUT));
+        ASSERT_NO_THROW(listener.start());
+        ASSERT_NO_THROW(startRequest(request));
+        ASSERT_NO_THROW(runIOService());
+        ASSERT_EQ(1, clients_.size());
+        TestHttpClientPtr client = *clients_.begin();
+        ASSERT_TRUE(client);
+
+        // Build the reference response.
+        std::ostringstream expected_response;
+        expected_response
+            << "HTTP/" << expected_version.major_ << "." << expected_version.minor_
+            << " 408 Request Timeout\r\n"
+            "Content-Length: 44\r\n"
+            "Content-Type: application/json\r\n"
+            "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+            "\r\n"
+            "{ \"result\": 408, \"text\": \"Request Timeout\" }";
+
+        // The server should wait for the missing part of the request for 1 second.
+        // The missing part never arrives so the server should respond with the
+        // HTTP Request Timeout status.
+        EXPECT_EQ(expected_response.str(), client->getResponse());
+    }
+
+    /// @brief Tests various cases when unexpected data is passed to the
+    /// socket write handler.
+    ///
+    /// This test uses the custom listener and the test specific derivations of
+    /// the @c HttpConnection class to enforce injection of the unexpected
+    /// data to the socket write callback. The two example applications of
+    /// this test are:
+    /// - injecting greater length value than the output buffer size,
+    /// - replacing the transaction with another transaction.
+    ///
+    /// It is expected that the socket write callback deals gracefully with
+    /// those situations.
+    ///
+    /// @tparam HttpConnectionType Test specific derivation of the
+    /// @c HttpConnection class.
+    template<typename HttpConnectionType>
+    void testWriteBufferIssues() {
+        // The HTTP/1.1 requests are by default persistent.
+        std::string request = "POST /foo/bar HTTP/1.1\r\n"
+            "Content-Type: application/json\r\n"
+            "Content-Length: 3\r\n\r\n"
+            "{ }";
+
+        // Use custom listener and the specialized connection object.
+        HttpListenerCustom<HttpConnectionType>
+            listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                     server_context_, factory_,
+                     HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                     HttpListener::IdleTimeout(IDLE_TIMEOUT));
+
+        ASSERT_NO_THROW(listener.start());
+
+        // Send the request.
+        ASSERT_NO_THROW(startRequest(request));
+
+        // Injecting unexpected data should not result in an exception.
+        ASSERT_NO_THROW(runIOService());
+
+        ASSERT_EQ(1, clients_.size());
+        TestHttpClientPtr client = *clients_.begin();
+        ASSERT_TRUE(client);
+        EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+    }
+
+    /// @brief IO service used in the tests.
+    IOService io_service_;
+
+    /// @brief Pointer to the response creator factory.
+    HttpResponseCreatorFactoryPtr factory_;
+
+    /// @brief Asynchronous timer service to detect timeouts.
+    IntervalTimer test_timer_;
+
+    /// @brief Asynchronous timer for running IO service for a specified amount
+    /// of time.
+    IntervalTimer run_io_service_timer_;
+
+    /// @brief List of client connections.
+    std::list<TestHttpClientPtr> clients_;
+
+    /// @brief Server TLS context.
+    TlsContextPtr server_context_;
+
+    /// @brief Client TLS context.
+    TlsContextPtr client_context_;
+};
+
+// This test verifies that HTTP connection can be established and used to
+// transmit HTTP request and receive a response.
+TEST_F(HttpsListenerTest, listen) {
+    const std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          server_context_, factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+    ASSERT_NO_THROW(listener.start());
+    ASSERT_EQ(SERVER_ADDRESS, listener.getLocalAddress().toText());
+    ASSERT_EQ(SERVER_PORT, listener.getLocalPort());
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+
+// This test verifies that persistent HTTP connection can be established when
+// "Connection: Keep-Alive" header value is specified.
+TEST_F(HttpsListenerTest, keepAlive) {
+
+    // The first request contains the keep-alive header which instructs the server
+    // to maintain the TCP connection after sending a response.
+    std::string request = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n"
+        "Connection: Keep-Alive\r\n\r\n"
+        "{ }";
+
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          server_context_, factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+
+    ASSERT_NO_THROW(listener.start());
+
+    // Send the request with the keep-alive header.
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_10()), client->getResponse());
+
+    // We have sent keep-alive header so we expect that the connection with
+    // the server remains active.
+    ASSERT_TRUE(client->isConnectionAlive());
+
+    // Test that we can send another request via the same connection. This time
+    // it lacks the keep-alive header, so the server should close the connection
+    // after sending the response.
+    request = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    // Send request reusing the existing connection.
+    ASSERT_NO_THROW(client->sendRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_10()), client->getResponse());
+
+    // Connection should have been closed by the server.
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+// This test verifies that persistent HTTP connection is established by default
+// when HTTP/1.1 is in use.
+TEST_F(HttpsListenerTest, persistentConnection) {
+
+    // The HTTP/1.1 requests are by default persistent.
+    std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          server_context_, factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+
+    ASSERT_NO_THROW(listener.start());
+
+    // Send the first request.
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    // HTTP/1.1 connection is persistent by default.
+    ASSERT_TRUE(client->isConnectionAlive());
+
+    // Test that we can send another request via the same connection. This time
+    // it includes the "Connection: close" header which instructs the server to
+    // close the connection after responding.
+    request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n"
+        "Connection: close\r\n\r\n"
+        "{ }";
+
+    // Send request reusing the existing connection.
+    ASSERT_NO_THROW(client->sendRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    // Connection should have been closed by the server.
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+// This test verifies that "keep-alive" connection is closed by the server after
+// an idle time.
+TEST_F(HttpsListenerTest, keepAliveTimeout) {
+
+    // The first request contains the keep-alive header which instructs the server
+    // to maintain the TCP connection after sending a response.
+    std::string request = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n"
+        "Connection: Keep-Alive\r\n\r\n"
+        "{ }";
+
+    // Specify the idle timeout of 500ms.
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          server_context_, factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(500));
+
+    ASSERT_NO_THROW(listener.start());
+
+    // Send the request with the keep-alive header.
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_10()), client->getResponse());
+
+    // We have sent keep-alive header so we expect that the connection with
+    // the server remains active.
+    ASSERT_TRUE(client->isConnectionAlive());
+
+    // Run IO service for 1000ms. The idle time is set to 500ms, so the connection
+    // should be closed by the server while we wait here.
+    runIOService(1000);
+
+    // Make sure the connection has been closed.
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    // Check if we can re-establish the connection and send another request.
+    clients_.clear();
+    request = "POST /foo/bar HTTP/1.0\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_10()), client->getResponse());
+
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+// This test verifies that persistent connection is closed by the server after
+// an idle time.
+TEST_F(HttpsListenerTest, persistentConnectionTimeout) {
+
+    // The HTTP/1.1 requests are by default persistent.
+    std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    // Specify the idle timeout of 500ms.
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          server_context_, factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(500));
+
+    ASSERT_NO_THROW(listener.start());
+
+    // Send the request.
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    // The connection should remain active.
+    ASSERT_TRUE(client->isConnectionAlive());
+
+    // Run IO service for 1000ms. The idle time is set to 500ms, so the connection
+    // should be closed by the server while we wait here.
+    runIOService(1000);
+
+    // Make sure the connection has been closed.
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    // Check if we can re-establish the connection and send another request.
+    clients_.clear();
+    request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n"
+        "Connection: close\r\n\r\n"
+        "{ }";
+
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+// This test verifies that HTTP/1.1 connection remains open even if there is an
+// error in the message body.
+TEST_F(HttpsListenerTest, persistentConnectionBadBody) {
+
+    // The HTTP/1.1 requests are by default persistent.
+    std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 12\r\n\r\n"
+        "{ \"a\": abc }";
+
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          server_context_, factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+
+    ASSERT_NO_THROW(listener.start());
+
+    // Send the request.
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ("HTTP/1.1 400 Bad Request\r\n"
+              "Content-Length: 40\r\n"
+              "Content-Type: application/json\r\n"
+              "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+              "\r\n"
+              "{ \"result\": 400, \"text\": \"Bad Request\" }",
+              client->getResponse());
+
+    // The connection should remain active.
+    ASSERT_TRUE(client->isConnectionAlive());
+
+    // Make sure that we can send another request. This time we specify the
+    // "close" connection-token to force the connection to close.
+    request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length: 3\r\n"
+        "Connection: close\r\n\r\n"
+        "{ }";
+
+    // Send request reusing the existing connection.
+    ASSERT_NO_THROW(client->sendRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    EXPECT_EQ(httpOk(HttpVersion::HTTP_11()), client->getResponse());
+
+    EXPECT_TRUE(client->isConnectionClosed());
+
+    listener.stop();
+    io_service_.poll();
+}
+
+// This test verifies that the HTTP listener can't be started twice.
+TEST_F(HttpsListenerTest, startTwice) {
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          server_context_, factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+    ASSERT_NO_THROW(listener.start());
+    EXPECT_THROW(listener.start(), HttpListenerError);
+}
+
+// This test verifies that Bad Request status is returned when the request
+// is malformed.
+TEST_F(HttpsListenerTest, badRequest) {
+    // Content-Type is wrong. This should result in Bad Request status.
+    const std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: foo\r\n"
+        "Content-Length: 3\r\n\r\n"
+        "{ }";
+
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS), SERVER_PORT,
+                          server_context_, factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+    ASSERT_NO_THROW(listener.start());
+    ASSERT_NO_THROW(startRequest(request));
+    ASSERT_NO_THROW(runIOService());
+    ASSERT_EQ(1, clients_.size());
+    TestHttpClientPtr client = *clients_.begin();
+    ASSERT_TRUE(client);
+    EXPECT_EQ("HTTP/1.1 400 Bad Request\r\n"
+              "Content-Length: 40\r\n"
+              "Content-Type: application/json\r\n"
+              "Date: Tue, 19 Dec 2016 18:53:35 GMT\r\n"
+              "\r\n"
+              "{ \"result\": 400, \"text\": \"Bad Request\" }",
+              client->getResponse());
+}
+
+// This test verifies that NULL pointer can't be specified for the
+// HttpResponseCreatorFactory.
+TEST_F(HttpsListenerTest, invalidFactory) {
+    EXPECT_THROW(HttpListener(io_service_, IOAddress(SERVER_ADDRESS),
+                              SERVER_PORT, server_context_,
+                              HttpResponseCreatorFactoryPtr(),
+                              HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                              HttpListener::IdleTimeout(IDLE_TIMEOUT)),
+                 HttpListenerError);
+}
+
+// This test verifies that the timeout of 0 can't be specified for the
+// Request Timeout.
+TEST_F(HttpsListenerTest, invalidRequestTimeout) {
+    EXPECT_THROW(HttpListener(io_service_, IOAddress(SERVER_ADDRESS),
+                              SERVER_PORT, server_context_, factory_,
+                              HttpListener::RequestTimeout(0),
+                              HttpListener::IdleTimeout(IDLE_TIMEOUT)),
+                 HttpListenerError);
+}
+
+// This test verifies that the timeout of 0 can't be specified for the
+// idle persistent connection timeout.
+TEST_F(HttpsListenerTest, invalidIdleTimeout) {
+    EXPECT_THROW(HttpListener(io_service_, IOAddress(SERVER_ADDRESS),
+                              SERVER_PORT, server_context_, factory_,
+                              HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                              HttpListener::IdleTimeout(0)),
+                 HttpListenerError);
+}
+
+// This test verifies that listener can't be bound to the port to which
+// other server is bound.
+TEST_F(HttpsListenerTest, addressInUse) {
+    tcp::acceptor acceptor(io_service_.get_io_service());
+    // Use other port than SERVER_PORT to make sure that this TCP connection
+    // doesn't affect subsequent tests.
+    tcp::endpoint endpoint(address::from_string(SERVER_ADDRESS),
+                           SERVER_PORT + 1);
+    acceptor.open(endpoint.protocol());
+    acceptor.bind(endpoint);
+
+    // Listener should report an error when we try to start it because another
+    // acceptor is bound to that port and address.
+    HttpListener listener(io_service_, IOAddress(SERVER_ADDRESS),
+                          SERVER_PORT + 1, server_context_, factory_,
+                          HttpListener::RequestTimeout(REQUEST_TIMEOUT),
+                          HttpListener::IdleTimeout(IDLE_TIMEOUT));
+    EXPECT_THROW(listener.start(), HttpListenerError);
+}
+
+// This test verifies that HTTP Request Timeout status is returned as
+// expected when the read part of the request contains the HTTP
+// version number. The timeout response should contain the same
+// HTTP version number as the partial request.
+TEST_F(HttpsListenerTest, requestTimeoutHttpVersionFound) {
+    // The part of the request specified here is correct but it is not
+    // a complete request.
+    const std::string request = "POST /foo/bar HTTP/1.1\r\n"
+        "Content-Type: application/json\r\n"
+        "Content-Length:";
+
+    testRequestTimeout(request, HttpVersion::HTTP_11());
+}
+
+// This test verifies that HTTP Request Timeout status is returned as
+// expected when the read part of the request does not contain
+// the HTTP version number. The timeout response should by default
+// contain HTTP/1.0 version number.
+TEST_F(HttpsListenerTest, requestTimeoutHttpVersionNotFound) {
+    // The part of the request specified here is correct but it is not
+    // a complete request.
+    const std::string request = "POST /foo/bar HTTP";
+
+    testRequestTimeout(request, HttpVersion::HTTP_10());
+}
+
+// This test verifies that injecting length value greater than the
+// output buffer length to the socket write callback does not cause
+// an exception.
+TEST_F(HttpsListenerTest, tooLongWriteBuffer) {
+    testWriteBufferIssues<HttpConnectionLongWriteBuffer>();
+}
+
+// This test verifies that changing the transaction before calling
+// the socket write callback does not cause an exception.
+TEST_F(HttpsListenerTest, transactionChangeDuringWrite) {
+    testWriteBufferIssues<HttpConnectionTransactionChange>();
+}
+
+}
diff --git a/src/lib/http/tests/url_unittests.cc b/src/lib/http/tests/url_unittests.cc
new file mode 100644
index 0000000..f024e61
--- /dev/null
+++ b/src/lib/http/tests/url_unittests.cc
@@ -0,0 +1,115 @@
+// Copyright (C) 2017-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <http/url.h>
+#include <gtest/gtest.h>
+#include <string>
+
+using namespace isc::http;
+
+namespace {
+
+/// @brief Test fixture class for @c Url class.
+class UrlTest : public ::testing::Test {
+public:
+
+    /// @brief Test valid URL.
+    ///
+    /// @param text_url URL is the text form.
+    /// @param expected_scheme Expected scheme.
+    /// @param expected_hostname Expected hostname.
+    /// @param expected_port Expected port.
+    /// @param expected_path Expected path.
+    void testValidUrl(const std::string& text_url,
+                      const Url::Scheme& expected_scheme,
+                      const std::string& expected_hostname,
+                      const unsigned expected_port,
+                      const std::string& expected_path) {
+        Url url(text_url);
+        ASSERT_TRUE(url.isValid()) << url.getErrorMessage();
+        EXPECT_EQ(expected_scheme, url.getScheme());
+        EXPECT_EQ(expected_hostname, url.getStrippedHostname());
+        EXPECT_EQ(expected_port, url.getPort());
+        EXPECT_EQ(expected_path, url.getPath());
+    }
+
+    /// @brief Test invalid URL.
+    ///
+    /// @param text_url URL is the text form.
+    void testInvalidUrl(const std::string& text_url) {
+        Url url(text_url);
+        EXPECT_FALSE(url.isValid());
+    }
+};
+
+// URL contains scheme and hostname.
+TEST_F(UrlTest, schemeHostname) {
+    testValidUrl("http://example.org", Url::HTTP, "example.org", 0, "");
+}
+
+// URL contains scheme, hostname and slash.
+TEST_F(UrlTest, schemeHostnameSlash) {
+    testValidUrl("http://example.org/", Url::HTTP, "example.org", 0, "/");
+}
+
+// URL contains scheme, IPv6 address and slash.
+TEST_F(UrlTest, schemeIPv6AddressSlash) {
+    testValidUrl("http://[2001:db8:1::100]/", Url::HTTP, "2001:db8:1::100", 0, "/");
+}
+
+// URL contains scheme, IPv4 address and slash.
+TEST_F(UrlTest, schemeIPv4AddressSlash) {
+    testValidUrl("http://192.0.2.2/", Url::HTTP, "192.0.2.2", 0, "/");
+}
+
+// URL contains scheme, hostname and path.
+TEST_F(UrlTest, schemeHostnamePath) {
+    testValidUrl("http://example.org/some/path", Url::HTTP, "example.org", 0,
+                 "/some/path");
+}
+
+// URL contains scheme, hostname and port.
+TEST_F(UrlTest, schemeHostnamePort) {
+    testValidUrl("http://example.org:8080/", Url::HTTP, "example.org", 8080, "/");
+}
+
+// URL contains scheme, hostname, port and slash.
+TEST_F(UrlTest, schemeHostnamePortSlash) {
+    testValidUrl("http://example.org:8080/", Url::HTTP, "example.org", 8080, "/");
+}
+
+// URL contains scheme, IPv6 address and port.
+TEST_F(UrlTest, schemeIPv6AddressPort) {
+    testValidUrl("http://[2001:db8:1::1]:8080/", Url::HTTP, "2001:db8:1::1", 8080, "/");
+}
+
+// URL contains scheme, hostname, port and path.
+TEST_F(UrlTest, schemeHostnamePortPath) {
+    testValidUrl("http://example.org:8080/path/", Url::HTTP, "example.org", 8080,
+                 "/path/");
+}
+
+// URL contains https scheme, hostname, port and path.
+TEST_F(UrlTest, secureSchemeHostnamePortPath) {
+    testValidUrl("https://example.org:8080/path/", Url::HTTPS, "example.org", 8080,
+                 "/path/");
+}
+
+// Tests various invalid URLS.
+TEST_F(UrlTest, invalidUrls) {
+    testInvalidUrl("example.org");
+    testInvalidUrl("file://example.org");
+    testInvalidUrl("http//example.org");
+    testInvalidUrl("http:/example.org");
+    testInvalidUrl("http://");
+    testInvalidUrl("http://[]");
+    testInvalidUrl("http://[2001:db8:1::1");
+    testInvalidUrl("http://example.org:");
+    testInvalidUrl("http://example.org:abc");
+}
+
+}