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diff --git a/src/lib/http/tests/post_request_unittests.cc b/src/lib/http/tests/post_request_unittests.cc
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+++ b/src/lib/http/tests/post_request_unittests.cc
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+// 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");
+}
+
+}