New upstream version 1.11.0+dfsgupstream/1.11.0+dfsg

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

24 files changed, 4189 insertions, 74 deletions

diff --git a/web/server/Makefile.am b/web/server/Makefile.am
new file mode 100644
index 000000000..843c4cc9b
--- /dev/null
+++ b/web/server/Makefile.am
@@ -0,0 +1,14 @@
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diff --git a/web/server/Makefile.in b/web/server/Makefile.in
new file mode 100644
index 000000000..4b2614c5a
--- /dev/null
+++ b/web/server/Makefile.in
@@ -0,0 +1,650 @@
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+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)
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+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
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diff --git a/web/server/README.md b/web/server/README.md
new file mode 100644
index 000000000..8a6cad139
--- /dev/null
+++ b/web/server/README.md
@@ -0,0 +1,107 @@
+# netdata web server
+
+netdata supports 3 implementation of its internal web server:
+
+- `static-threaded` is a web server with a fix (configured number of threads)
+- `single-threaded` is a simple web server running with a single thread
+- `multi-threaded` is a web server that spawns a thread for each client connection
+- `none` to disable the web server
+
+We suggest to use the `static-threaded` one. It is the most efficient.
+
+All versions of the web servers use non-blocking I/O.
+
+All web servers respect the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection.
+
+
+## Configuration
+
+#### selecting the web server
+
+You can select the web server implementation by editing `netdata.conf` and setting:
+
+```
+[web]
+    mode = none | single-threaded | multi-threaded | static-threaded
+```
+
+The `static` web server supports also these settings:
+
+```
+[web]
+    mode = static-threaded
+    web server threads = 4
+    web server max sockets = 512
+```
+
+The default number of processor threads is `min(cpu cores, 6)`.
+
+The `web server max sockets` setting is automatically adjusted to 50% of the max number of open files
+netdata is allowed to use (via `/etc/security/limits.conf` or systemd), to allow enough file descriptors
+to be available for data collection.
+
+#### binding netdata to multiple ports
+
+netdata can bind to multiple IPs and ports. Up to 100 sockets can be used
+(you can increase it at compile time with `CFLAGS="-DMAX_LISTEN_FDS=200" ./netdata-installer.sh ...`).
+
+The ports to bind are controlled via `[web].bind to`, like this:
+   
+```
+[web]
+   default port = 19999
+   bind to = 127.0.0.1 10.1.1.1:19998 hostname:19997 [::]:19996 localhost:19995 *:http unix:/tmp/netdata.sock
+```
+   
+Using the above, netdata will bind to:
+   - IPv4 127.0.0.1 at port 19999 (port was used from `default port`)
+   - IPv4 10.1.1.1 at port 19998
+   - All the IPs `hostname` resolves to (both IPv4 and IPv6 depending on the resolved IPs) at port 19997
+   - All IPv6 IPs at port 19996
+   - All the IPs `localhost` resolves to (both IPv4 and IPv6 depending the resolved IPs) at port 19996
+   - All IPv4 and IPv6 IPs at port `http` as set in `/etc/services`
+   - Unix domain socket `/tmp/netdata.sock`
+   
+The option `[web].default port` is used when an entries in `[web].bind to` do not specify a port.
+
+#### access lists
+
+Netdata supports access lists in `netdata.conf`:
+
+```
+[web]
+	allow connections from = localhost *
+	allow dashboard from = localhost *
+	allow badges from = *
+	allow streaming from = *
+	allow netdata.conf from = localhost fd* 10.* 192.168.* 172.16.* 172.17.* 172.18.* 172.19.* 172.20.* 172.21.* 172.22.* 172.23.* 172.24.* 172.25.* 172.26.* 172.27.* 172.28.* 172.29.* 172.30.* 172.31.*
+```
+
+`*` does string matches on the IPs of the clients.
+
+- `allow connections from` matches anyone that connects on the netdata port(s).
+   So, if someone is not allowed, it will be connected and disconnected immediately, without reading even
+   a single byte from its connection. This is a global settings with higher priority to any of the ones below.
+
+- `allow dashboard from` receives the request and examines if it is a static dashboard file or an API call the
+   dashboards do.
+
+- `allow badges from` checks if the API request is for a badge. Badges are not matched by `allow dashboard from`.
+
+- `allow streaming from` checks if the slave willing to stream metrics to this netdata is allowed.
+   This can be controlled per API KEY and MACHINE GUID in [stream.conf](../../streaming/stream.conf).
+   The setting in `netdata.conf` is checked before the ones in [stream.conf](../../streaming/stream.conf).
+
+- `allow netdata.conf from` checks the IP to allow `http://netdata.host:19999/netdata.conf`.
+   By default it allows only private lans.
+
+## DDoS protection
+
+If you publish your netdata to the internet, you may want to apply some protection against DDoS:
+
+1. Use the `static-threaded` web server (it is the default)
+2. Use reasonable `[web].web server max sockets` (the default is)
+3. Don't use all your cpu cores for netdata (lower `[web].web server threads`)
+4. Run netdata with a low process scheduling priority (the default is the lowest)
+5. If possible, proxy netdata via a full featured web server (nginx, apache, etc)
+
diff --git a/web/server/multi/Makefile.am b/web/server/multi/Makefile.am
new file mode 100644
index 000000000..90cc9ca1e
--- /dev/null
+++ b/web/server/multi/Makefile.am
@@ -0,0 +1,11 @@
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+
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+
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+	$(NULL)
diff --git a/web/server/multi/Makefile.in b/web/server/multi/Makefile.in
new file mode 100644
index 000000000..61ef9455f
--- /dev/null
+++ b/web/server/multi/Makefile.in
@@ -0,0 +1,647 @@
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
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+
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diff --git a/web/server/multi/README.md b/web/server/multi/README.md
new file mode 100644
index 000000000..f51073e93
--- /dev/null
+++ b/web/server/multi/README.md
@@ -0,0 +1,8 @@
+# `multi-threaded` web server
+
+The `multi-threaded` web server spawns a thread for each connection it receives.
+
+Each thread uses non-blocking I/O so it can serve any number of web requests in parallel,
+though this is not supported by HTTP, so in practice each thread serves all the requests sequentially.
+
+Each thread respects the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection. 
\ No newline at end of file
diff --git a/web/server/multi/multi-threaded.c b/web/server/multi/multi-threaded.c
new file mode 100644
index 000000000..37bdd38ad
--- /dev/null
+++ b/web/server/multi/multi-threaded.c
@@ -0,0 +1,314 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#define WEB_SERVER_INTERNALS 1
+#include "multi-threaded.h"
+
+// --------------------------------------------------------------------------------------
+// the thread of a single client - for the MULTI-THREADED web server
+
+// 1. waits for input and output, using async I/O
+// 2. it processes HTTP requests
+// 3. it generates HTTP responses
+// 4. it copies data from input to output if mode is FILECOPY
+
+int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
+int web_client_first_request_timeout = DEFAULT_TIMEOUT_TO_RECEIVE_FIRST_WEB_REQUEST;
+long web_client_streaming_rate_t = 0L;
+
+static void multi_threaded_web_client_worker_main_cleanup(void *ptr) {
+    struct web_client *w = ptr;
+    WEB_CLIENT_IS_DEAD(w);
+    w->running = 0;
+}
+
+static void *multi_threaded_web_client_worker_main(void *ptr) {
+    netdata_thread_cleanup_push(multi_threaded_web_client_worker_main_cleanup, ptr);
+
+            struct web_client *w = ptr;
+            w->running = 1;
+
+            struct pollfd fds[2], *ifd, *ofd;
+            int retval, timeout_ms;
+            nfds_t fdmax = 0;
+
+            while(!netdata_exit) {
+                if(unlikely(web_client_check_dead(w))) {
+                    debug(D_WEB_CLIENT, "%llu: client is dead.", w->id);
+                    break;
+                }
+                else if(unlikely(!web_client_has_wait_receive(w) && !web_client_has_wait_send(w))) {
+                    debug(D_WEB_CLIENT, "%llu: client is not set for neither receiving nor sending data.", w->id);
+                    break;
+                }
+
+                if(unlikely(w->ifd < 0 || w->ofd < 0)) {
+                    error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd", w->id, w->ifd, w->ofd);
+                    break;
+                }
+
+                if(w->ifd == w->ofd) {
+                    fds[0].fd = w->ifd;
+                    fds[0].events = 0;
+                    fds[0].revents = 0;
+
+                    if(web_client_has_wait_receive(w)) fds[0].events |= POLLIN;
+                    if(web_client_has_wait_send(w))    fds[0].events |= POLLOUT;
+
+                    fds[1].fd = -1;
+                    fds[1].events = 0;
+                    fds[1].revents = 0;
+
+                    ifd = ofd = &fds[0];
+
+                    fdmax = 1;
+                }
+                else {
+                    fds[0].fd = w->ifd;
+                    fds[0].events = 0;
+                    fds[0].revents = 0;
+                    if(web_client_has_wait_receive(w)) fds[0].events |= POLLIN;
+                    ifd = &fds[0];
+
+                    fds[1].fd = w->ofd;
+                    fds[1].events = 0;
+                    fds[1].revents = 0;
+                    if(web_client_has_wait_send(w))    fds[1].events |= POLLOUT;
+                    ofd = &fds[1];
+
+                    fdmax = 2;
+                }
+
+                debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, web_client_has_wait_receive(w)?"INPUT":"", web_client_has_wait_send(w)?"OUTPUT":"");
+                errno = 0;
+                timeout_ms = web_client_timeout * 1000;
+                retval = poll(fds, fdmax, timeout_ms);
+
+                if(unlikely(netdata_exit)) break;
+
+                if(unlikely(retval == -1)) {
+                    if(errno == EAGAIN || errno == EINTR) {
+                        debug(D_WEB_CLIENT, "%llu: EAGAIN received.", w->id);
+                        continue;
+                    }
+
+                    debug(D_WEB_CLIENT, "%llu: LISTENER: poll() failed (input fd = %d, output fd = %d). Closing client.", w->id, w->ifd, w->ofd);
+                    break;
+                }
+                else if(unlikely(!retval)) {
+                    debug(D_WEB_CLIENT, "%llu: Timeout while waiting socket async I/O for %s %s", w->id, web_client_has_wait_receive(w)?"INPUT":"", web_client_has_wait_send(w)?"OUTPUT":"");
+                    break;
+                }
+
+                if(unlikely(netdata_exit)) break;
+
+                int used = 0;
+                if(web_client_has_wait_send(w) && ofd->revents & POLLOUT) {
+                    used++;
+                    if(web_client_send(w) < 0) {
+                        debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
+                        break;
+                    }
+                }
+
+                if(unlikely(netdata_exit)) break;
+
+                if(web_client_has_wait_receive(w) && (ifd->revents & POLLIN || ifd->revents & POLLPRI)) {
+                    used++;
+                    if(web_client_receive(w) < 0) {
+                        debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
+                        break;
+                    }
+
+                    if(w->mode == WEB_CLIENT_MODE_NORMAL) {
+                        debug(D_WEB_CLIENT, "%llu: Attempting to process received data.", w->id);
+                        web_client_process_request(w);
+
+                        // if the sockets are closed, may have transferred this client
+                        // to plugins.d
+                        if(unlikely(w->mode == WEB_CLIENT_MODE_STREAM))
+                            break;
+                    }
+                }
+
+                if(unlikely(!used)) {
+                    debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on socket.", w->id);
+                    break;
+                }
+            }
+
+            if(w->mode != WEB_CLIENT_MODE_STREAM)
+                web_server_log_connection(w, "DISCONNECTED");
+
+            web_client_request_done(w);
+
+            debug(D_WEB_CLIENT, "%llu: done...", w->id);
+
+            // close the sockets/files now
+            // to free file descriptors
+            if(w->ifd == w->ofd) {
+                if(w->ifd != -1) close(w->ifd);
+            }
+            else {
+                if(w->ifd != -1) close(w->ifd);
+                if(w->ofd != -1) close(w->ofd);
+            }
+            w->ifd = -1;
+            w->ofd = -1;
+
+    netdata_thread_cleanup_pop(1);
+    return NULL;
+}
+
+// --------------------------------------------------------------------------------------
+// the main socket listener - MULTI-THREADED
+
+// 1. it accepts new incoming requests on our port
+// 2. creates a new web_client for each connection received
+// 3. spawns a new netdata_thread to serve the client (this is optimal for keep-alive clients)
+// 4. cleans up old web_clients that their netdata_threads have been exited
+
+static void web_client_multi_threaded_web_server_release_clients(void) {
+    struct web_client *w;
+    for(w = web_clients_cache.used; w ; ) {
+        if(unlikely(!w->running && web_client_check_dead(w))) {
+            struct web_client *t = w->next;
+            web_client_release(w);
+            w = t;
+        }
+        else
+            w = w->next;
+    }
+}
+
+static void web_client_multi_threaded_web_server_stop_all_threads(void) {
+    struct web_client *w;
+
+    int found = 1;
+    usec_t max = 2 * USEC_PER_SEC, step = 50000;
+    for(w = web_clients_cache.used; w ; w = w->next) {
+        if(w->running) {
+            found++;
+            info("stopping web client %s, id %llu", w->client_ip, w->id);
+            netdata_thread_cancel(w->thread);
+        }
+    }
+
+    while(found && max > 0) {
+        max -= step;
+        info("Waiting %d web threads to finish...", found);
+        sleep_usec(step);
+        found = 0;
+        for(w = web_clients_cache.used; w ; w = w->next)
+            if(w->running) found++;
+    }
+
+    if(found)
+        error("%d web threads are taking too long to finish. Giving up.", found);
+}
+
+static struct pollfd *socket_listen_main_multi_threaded_fds = NULL;
+
+static void socket_listen_main_multi_threaded_cleanup(void *data) {
+    struct netdata_static_thread *static_thread = (struct netdata_static_thread *)data;
+    static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
+
+    info("cleaning up...");
+
+    info("releasing allocated memory...");
+    freez(socket_listen_main_multi_threaded_fds);
+
+    info("closing all sockets...");
+    listen_sockets_close(&api_sockets);
+
+    info("stopping all running web server threads...");
+    web_client_multi_threaded_web_server_stop_all_threads();
+
+    info("freeing web clients cache...");
+    web_client_cache_destroy();
+
+    info("cleanup completed.");
+    static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
+}
+
+#define CLEANUP_EVERY_EVENTS 60
+void *socket_listen_main_multi_threaded(void *ptr) {
+    netdata_thread_cleanup_push(socket_listen_main_multi_threaded_cleanup, ptr);
+
+            web_server_mode = WEB_SERVER_MODE_MULTI_THREADED;
+            web_server_is_multithreaded = 1;
+
+            struct web_client *w;
+            int retval, counter = 0;
+
+            if(!api_sockets.opened)
+                fatal("LISTENER: No sockets to listen to.");
+
+            socket_listen_main_multi_threaded_fds = callocz(sizeof(struct pollfd), api_sockets.opened);
+
+            size_t i;
+            for(i = 0; i < api_sockets.opened ;i++) {
+                socket_listen_main_multi_threaded_fds[i].fd = api_sockets.fds[i];
+                socket_listen_main_multi_threaded_fds[i].events = POLLIN;
+                socket_listen_main_multi_threaded_fds[i].revents = 0;
+
+                info("Listening on '%s'", (api_sockets.fds_names[i])?api_sockets.fds_names[i]:"UNKNOWN");
+            }
+
+            int timeout_ms = 1 * 1000;
+
+            while(!netdata_exit) {
+
+                // debug(D_WEB_CLIENT, "LISTENER: Waiting...");
+                retval = poll(socket_listen_main_multi_threaded_fds, api_sockets.opened, timeout_ms);
+
+                if(unlikely(retval == -1)) {
+                    error("LISTENER: poll() failed.");
+                    continue;
+                }
+                else if(unlikely(!retval)) {
+                    debug(D_WEB_CLIENT, "LISTENER: poll() timeout.");
+                    counter++;
+                    continue;
+                }
+
+                for(i = 0 ; i < api_sockets.opened ; i++) {
+                    short int revents = socket_listen_main_multi_threaded_fds[i].revents;
+
+                    // check for new incoming connections
+                    if(revents & POLLIN || revents & POLLPRI) {
+                        socket_listen_main_multi_threaded_fds[i].revents = 0;
+
+                        w = web_client_create_on_listenfd(socket_listen_main_multi_threaded_fds[i].fd);
+                        if(unlikely(!w)) {
+                            // no need for error log - web_client_create_on_listenfd already logged the error
+                            continue;
+                        }
+
+                        if(api_sockets.fds_families[i] == AF_UNIX)
+                            web_client_set_unix(w);
+                        else
+                            web_client_set_tcp(w);
+
+                        char tag[NETDATA_THREAD_TAG_MAX + 1];
+                        snprintfz(tag, NETDATA_THREAD_TAG_MAX, "WEB_CLIENT[%llu,[%s]:%s]", w->id, w->client_ip, w->client_port);
+
+                        w->running = 1;
+                        if(netdata_thread_create(&w->thread, tag, NETDATA_THREAD_OPTION_DONT_LOG, multi_threaded_web_client_worker_main, w) != 0) {
+                            w->running = 0;
+                            web_client_release(w);
+                        }
+                    }
+                }
+
+                counter++;
+                if(counter > CLEANUP_EVERY_EVENTS) {
+                    counter = 0;
+                    web_client_multi_threaded_web_server_release_clients();
+                }
+            }
+
+    netdata_thread_cleanup_pop(1);
+    return NULL;
+}
+
+
diff --git a/web/server/multi/multi-threaded.h b/web/server/multi/multi-threaded.h
new file mode 100644
index 000000000..d7ebf3c54
--- /dev/null
+++ b/web/server/multi/multi-threaded.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_WEB_SERVER_MULTI_THREADED_H
+#define NETDATA_WEB_SERVER_MULTI_THREADED_H
+
+#include "web/server/web_server.h"
+
+extern void *socket_listen_main_multi_threaded(void *ptr);
+
+#endif //NETDATA_WEB_SERVER_MULTI_THREADED_H
diff --git a/web/server/single/Makefile.am b/web/server/single/Makefile.am
new file mode 100644
index 000000000..90cc9ca1e
--- /dev/null
+++ b/web/server/single/Makefile.am
@@ -0,0 +1,11 @@
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+
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+
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+	README.md \
+	$(NULL)
diff --git a/web/server/single/Makefile.in b/web/server/single/Makefile.in
new file mode 100644
index 000000000..a8ae2a35b
--- /dev/null
+++ b/web/server/single/Makefile.in
@@ -0,0 +1,647 @@
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+	     $$unique
+
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+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
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+
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
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+
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+			   sort -u` ;; \
+	esac; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
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+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
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+	    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:
+
+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)
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+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
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diff --git a/web/server/single/README.md b/web/server/single/README.md
new file mode 100644
index 000000000..df5fe56e3
--- /dev/null
+++ b/web/server/single/README.md
@@ -0,0 +1,6 @@
+# `single-threaded` web server
+
+The `single-threaded` web server runs as a single thread inside netdata.
+It uses non-blocking I/O so it can serve any number of web requests in parallel.
+
+This web server respects the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection.
\ No newline at end of file
diff --git a/web/server/single/single-threaded.c b/web/server/single/single-threaded.c
new file mode 100644
index 000000000..7e89ee683
--- /dev/null
+++ b/web/server/single/single-threaded.c
@@ -0,0 +1,194 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#define WEB_SERVER_INTERNALS 1
+#include "single-threaded.h"
+
+// --------------------------------------------------------------------------------------
+// the main socket listener - SINGLE-THREADED
+
+struct web_client *single_threaded_clients[FD_SETSIZE];
+
+static inline int single_threaded_link_client(struct web_client *w, fd_set *ifds, fd_set *ofds, fd_set *efds, int *max) {
+    if(unlikely(web_client_check_dead(w) || (!web_client_has_wait_receive(w) && !web_client_has_wait_send(w)))) {
+        return 1;
+    }
+
+    if(unlikely(w->ifd < 0 || w->ifd >= (int)FD_SETSIZE || w->ofd < 0 || w->ofd >= (int)FD_SETSIZE)) {
+        error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd < FD_SETSIZE (%d)", w->id, w->ifd, w->ofd, (int)FD_SETSIZE);
+        return 1;
+    }
+
+    FD_SET(w->ifd, efds);
+    if(unlikely(*max < w->ifd)) *max = w->ifd;
+
+    if(unlikely(w->ifd != w->ofd)) {
+        if(*max < w->ofd) *max = w->ofd;
+        FD_SET(w->ofd, efds);
+    }
+
+    if(web_client_has_wait_receive(w)) FD_SET(w->ifd, ifds);
+    if(web_client_has_wait_send(w))    FD_SET(w->ofd, ofds);
+
+    single_threaded_clients[w->ifd] = w;
+    single_threaded_clients[w->ofd] = w;
+
+    return 0;
+}
+
+static inline int single_threaded_unlink_client(struct web_client *w, fd_set *ifds, fd_set *ofds, fd_set *efds) {
+    FD_CLR(w->ifd, efds);
+    if(unlikely(w->ifd != w->ofd)) FD_CLR(w->ofd, efds);
+
+    if(web_client_has_wait_receive(w)) FD_CLR(w->ifd, ifds);
+    if(web_client_has_wait_send(w))    FD_CLR(w->ofd, ofds);
+
+    single_threaded_clients[w->ifd] = NULL;
+    single_threaded_clients[w->ofd] = NULL;
+
+    if(unlikely(web_client_check_dead(w) || (!web_client_has_wait_receive(w) && !web_client_has_wait_send(w)))) {
+        return 1;
+    }
+
+    return 0;
+}
+
+static void socket_listen_main_single_threaded_cleanup(void *data) {
+    struct netdata_static_thread *static_thread = (struct netdata_static_thread *)data;
+    static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
+
+    info("closing all sockets...");
+    listen_sockets_close(&api_sockets);
+
+    info("freeing web clients cache...");
+    web_client_cache_destroy();
+
+    info("cleanup completed.");
+    static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
+}
+
+void *socket_listen_main_single_threaded(void *ptr) {
+    netdata_thread_cleanup_push(socket_listen_main_single_threaded_cleanup, ptr);
+    web_server_mode = WEB_SERVER_MODE_SINGLE_THREADED;
+    web_server_is_multithreaded = 0;
+
+    struct web_client *w;
+
+    if(!api_sockets.opened)
+        fatal("LISTENER: no listen sockets available.");
+
+    size_t i;
+    for(i = 0; i < (size_t)FD_SETSIZE ; i++)
+        single_threaded_clients[i] = NULL;
+
+    fd_set ifds, ofds, efds, rifds, rofds, refds;
+    FD_ZERO (&ifds);
+    FD_ZERO (&ofds);
+    FD_ZERO (&efds);
+    int fdmax = 0;
+
+    for(i = 0; i < api_sockets.opened ; i++) {
+        if (api_sockets.fds[i] < 0 || api_sockets.fds[i] >= (int)FD_SETSIZE)
+            fatal("LISTENER: Listen socket %d is not ready, or invalid.", api_sockets.fds[i]);
+
+        info("Listening on '%s'", (api_sockets.fds_names[i])?api_sockets.fds_names[i]:"UNKNOWN");
+
+        FD_SET(api_sockets.fds[i], &ifds);
+        FD_SET(api_sockets.fds[i], &efds);
+        if(fdmax < api_sockets.fds[i])
+            fdmax = api_sockets.fds[i];
+    }
+
+    while(!netdata_exit) {
+        debug(D_WEB_CLIENT_ACCESS, "LISTENER: single threaded web server waiting (fdmax = %d)...", fdmax);
+
+        struct timeval tv = { .tv_sec = 1, .tv_usec = 0 };
+        rifds = ifds;
+        rofds = ofds;
+        refds = efds;
+        int retval = select(fdmax+1, &rifds, &rofds, &refds, &tv);
+
+        if(unlikely(retval == -1)) {
+            error("LISTENER: select() failed.");
+            continue;
+        }
+        else if(likely(retval)) {
+            debug(D_WEB_CLIENT_ACCESS, "LISTENER: got something.");
+
+            for(i = 0; i < api_sockets.opened ; i++) {
+                if (FD_ISSET(api_sockets.fds[i], &rifds)) {
+                    debug(D_WEB_CLIENT_ACCESS, "LISTENER: new connection.");
+                    w = web_client_create_on_listenfd(api_sockets.fds[i]);
+                    if(unlikely(!w))
+                        continue;
+
+                    if(api_sockets.fds_families[i] == AF_UNIX)
+                        web_client_set_unix(w);
+                    else
+                        web_client_set_tcp(w);
+
+                    if (single_threaded_link_client(w, &ifds, &ofds, &ifds, &fdmax) != 0) {
+                        web_client_release(w);
+                    }
+                }
+            }
+
+            for(i = 0 ; i <= (size_t)fdmax ; i++) {
+                if(likely(!FD_ISSET(i, &rifds) && !FD_ISSET(i, &rofds) && !FD_ISSET(i, &refds)))
+                    continue;
+
+                w = single_threaded_clients[i];
+                if(unlikely(!w)) {
+                    // error("no client on slot %zu", i);
+                    continue;
+                }
+
+                if(unlikely(single_threaded_unlink_client(w, &ifds, &ofds, &efds) != 0)) {
+                    // error("failed to unlink client %zu", i);
+                    web_client_release(w);
+                    continue;
+                }
+
+                if (unlikely(FD_ISSET(w->ifd, &refds) || FD_ISSET(w->ofd, &refds))) {
+                    // error("no input on client %zu", i);
+                    web_client_release(w);
+                    continue;
+                }
+
+                if (unlikely(web_client_has_wait_receive(w) && FD_ISSET(w->ifd, &rifds))) {
+                    if (unlikely(web_client_receive(w) < 0)) {
+                        // error("cannot read from client %zu", i);
+                        web_client_release(w);
+                        continue;
+                    }
+
+                    if (w->mode != WEB_CLIENT_MODE_FILECOPY) {
+                        debug(D_WEB_CLIENT, "%llu: Processing received data.", w->id);
+                        web_client_process_request(w);
+                    }
+                }
+
+                if (unlikely(web_client_has_wait_send(w) && FD_ISSET(w->ofd, &rofds))) {
+                    if (unlikely(web_client_send(w) < 0)) {
+                        // error("cannot send data to client %zu", i);
+                        debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
+                        web_client_release(w);
+                        continue;
+                    }
+                }
+
+                if(unlikely(single_threaded_link_client(w, &ifds, &ofds, &efds, &fdmax) != 0)) {
+                    // error("failed to link client %zu", i);
+                    web_client_release(w);
+                }
+            }
+        }
+        else {
+            debug(D_WEB_CLIENT_ACCESS, "LISTENER: single threaded web server timeout.");
+        }
+    }
+
+    netdata_thread_cleanup_pop(1);
+    return NULL;
+}
+
+
diff --git a/web/server/single/single-threaded.h b/web/server/single/single-threaded.h
new file mode 100644
index 000000000..fab4ceba1
--- /dev/null
+++ b/web/server/single/single-threaded.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_WEB_SERVER_SINGLE_THREADED_H
+#define NETDATA_WEB_SERVER_SINGLE_THREADED_H
+
+#include "web/server/web_server.h"
+
+extern void *socket_listen_main_single_threaded(void *ptr);
+
+#endif //NETDATA_WEB_SERVER_SINGLE_THREADED_H
diff --git a/web/server/static/Makefile.am b/web/server/static/Makefile.am
new file mode 100644
index 000000000..90cc9ca1e
--- /dev/null
+++ b/web/server/static/Makefile.am
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+SUBDIRS = \
+    $(NULL)
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
diff --git a/web/server/static/Makefile.in b/web/server/static/Makefile.in
new file mode 100644
index 000000000..f9dda4fa2
--- /dev/null
+++ b/web/server/static/Makefile.in
@@ -0,0 +1,647 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+
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+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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diff --git a/web/server/static/README.md b/web/server/static/README.md
new file mode 100644
index 000000000..16febdb32
--- /dev/null
+++ b/web/server/static/README.md
@@ -0,0 +1,9 @@
+# `static-threaded` web server
+
+The `static-threaded` web server spawns a fixed number of threads.
+All the threads are concurrently listening for web requests on the same sockets.
+The kernel distributes the incoming requests to them.
+
+Each thread uses non-blocking I/O so it can serve any number of web requests in parallel.
+
+This web server respects the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection. 
\ No newline at end of file
diff --git a/web/server/static/static-threaded.c b/web/server/static/static-threaded.c
new file mode 100644
index 000000000..56b8dbf8d
--- /dev/null
+++ b/web/server/static/static-threaded.c
@@ -0,0 +1,424 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#define WEB_SERVER_INTERNALS 1
+#include "static-threaded.h"
+
+// ----------------------------------------------------------------------------
+// high level web clients connection management
+
+static struct web_client *web_client_create_on_fd(int fd, const char *client_ip, const char *client_port) {
+    struct web_client *w;
+
+    w = web_client_get_from_cache_or_allocate();
+    w->ifd = w->ofd = fd;
+
+    strncpyz(w->client_ip, client_ip, sizeof(w->client_ip) - 1);
+    strncpyz(w->client_port, client_port, sizeof(w->client_port) - 1);
+
+    if(unlikely(!*w->client_ip))   strcpy(w->client_ip,   "-");
+    if(unlikely(!*w->client_port)) strcpy(w->client_port, "-");
+
+    web_client_initialize_connection(w);
+    return(w);
+}
+
+// --------------------------------------------------------------------------------------
+// the main socket listener - STATIC-THREADED
+
+struct web_server_static_threaded_worker {
+    netdata_thread_t thread;
+
+    int id;
+    int running;
+
+    size_t max_sockets;
+
+    volatile size_t connected;
+    volatile size_t disconnected;
+    volatile size_t receptions;
+    volatile size_t sends;
+    volatile size_t max_concurrent;
+
+    volatile size_t files_read;
+    volatile size_t file_reads;
+};
+
+static long long static_threaded_workers_count = 1;
+static struct web_server_static_threaded_worker *static_workers_private_data = NULL;
+static __thread struct web_server_static_threaded_worker *worker_private = NULL;
+
+// ----------------------------------------------------------------------------
+
+static inline int web_server_check_client_status(struct web_client *w) {
+    if(unlikely(web_client_check_dead(w) || (!web_client_has_wait_receive(w) && !web_client_has_wait_send(w))))
+        return -1;
+
+    return 0;
+}
+
+// ----------------------------------------------------------------------------
+// web server files
+
+static void *web_server_file_add_callback(POLLINFO *pi, short int *events, void *data) {
+    struct web_client *w = (struct web_client *)data;
+
+    worker_private->files_read++;
+
+    debug(D_WEB_CLIENT, "%llu: ADDED FILE READ ON FD %d", w->id, pi->fd);
+    *events = POLLIN;
+    pi->data = w;
+    return w;
+}
+
+static void web_werver_file_del_callback(POLLINFO *pi) {
+    struct web_client *w = (struct web_client *)pi->data;
+    debug(D_WEB_CLIENT, "%llu: RELEASE FILE READ ON FD %d", w->id, pi->fd);
+
+    w->pollinfo_filecopy_slot = 0;
+
+    if(unlikely(!w->pollinfo_slot)) {
+        debug(D_WEB_CLIENT, "%llu: CROSS WEB CLIENT CLEANUP (iFD %d, oFD %d)", w->id, pi->fd, w->ofd);
+        web_client_release(w);
+    }
+}
+
+static int web_server_file_read_callback(POLLINFO *pi, short int *events) {
+    struct web_client *w = (struct web_client *)pi->data;
+
+    // if there is no POLLINFO linked to this, it means the client disconnected
+    // stop the file reading too
+    if(unlikely(!w->pollinfo_slot)) {
+        debug(D_WEB_CLIENT, "%llu: PREVENTED ATTEMPT TO READ FILE ON FD %d, ON CLOSED WEB CLIENT", w->id, pi->fd);
+        return -1;
+    }
+
+    if(unlikely(w->mode != WEB_CLIENT_MODE_FILECOPY || w->ifd == w->ofd)) {
+        debug(D_WEB_CLIENT, "%llu: PREVENTED ATTEMPT TO READ FILE ON FD %d, ON NON-FILECOPY WEB CLIENT", w->id, pi->fd);
+        return -1;
+    }
+
+    debug(D_WEB_CLIENT, "%llu: READING FILE ON FD %d", w->id, pi->fd);
+
+    worker_private->file_reads++;
+    ssize_t ret = unlikely(web_client_read_file(w));
+
+    if(likely(web_client_has_wait_send(w))) {
+        POLLJOB *p = pi->p;                                        // our POLLJOB
+        POLLINFO *wpi = pollinfo_from_slot(p, w->pollinfo_slot);  // POLLINFO of the client socket
+
+        debug(D_WEB_CLIENT, "%llu: SIGNALING W TO SEND (iFD %d, oFD %d)", w->id, pi->fd, wpi->fd);
+        p->fds[wpi->slot].events |= POLLOUT;
+    }
+
+    if(unlikely(ret <= 0 || w->ifd == w->ofd)) {
+        debug(D_WEB_CLIENT, "%llu: DONE READING FILE ON FD %d", w->id, pi->fd);
+        return -1;
+    }
+
+    *events = POLLIN;
+    return 0;
+}
+
+static int web_server_file_write_callback(POLLINFO *pi, short int *events) {
+    (void)pi;
+    (void)events;
+
+    error("Writing to web files is not supported!");
+
+    return -1;
+}
+
+// ----------------------------------------------------------------------------
+// web server clients
+
+static void *web_server_add_callback(POLLINFO *pi, short int *events, void *data) {
+    (void)data;
+
+    worker_private->connected++;
+
+    size_t concurrent = worker_private->connected - worker_private->disconnected;
+    if(unlikely(concurrent > worker_private->max_concurrent))
+        worker_private->max_concurrent = concurrent;
+
+    *events = POLLIN;
+
+    debug(D_WEB_CLIENT_ACCESS, "LISTENER on %d: new connection.", pi->fd);
+    struct web_client *w = web_client_create_on_fd(pi->fd, pi->client_ip, pi->client_port);
+    w->pollinfo_slot = pi->slot;
+
+    if(unlikely(pi->socktype == AF_UNIX))
+        web_client_set_unix(w);
+    else
+        web_client_set_tcp(w);
+
+    debug(D_WEB_CLIENT, "%llu: ADDED CLIENT FD %d", w->id, pi->fd);
+    return w;
+}
+
+// TCP client disconnected
+static void web_server_del_callback(POLLINFO *pi) {
+    worker_private->disconnected++;
+
+    struct web_client *w = (struct web_client *)pi->data;
+
+    w->pollinfo_slot = 0;
+    if(unlikely(w->pollinfo_filecopy_slot)) {
+        POLLINFO *fpi = pollinfo_from_slot(pi->p, w->pollinfo_filecopy_slot);  // POLLINFO of the client socket
+        (void)fpi;
+
+        debug(D_WEB_CLIENT, "%llu: THE CLIENT WILL BE FRED BY READING FILE JOB ON FD %d", w->id, fpi->fd);
+    }
+    else {
+        if(web_client_flag_check(w, WEB_CLIENT_FLAG_DONT_CLOSE_SOCKET))
+            pi->flags |= POLLINFO_FLAG_DONT_CLOSE;
+
+        debug(D_WEB_CLIENT, "%llu: CLOSING CLIENT FD %d", w->id, pi->fd);
+        web_client_release(w);
+    }
+}
+
+static int web_server_rcv_callback(POLLINFO *pi, short int *events) {
+    worker_private->receptions++;
+
+    struct web_client *w = (struct web_client *)pi->data;
+    int fd = pi->fd;
+
+    if(unlikely(web_client_receive(w) < 0))
+        return -1;
+
+    debug(D_WEB_CLIENT, "%llu: processing received data on fd %d.", w->id, fd);
+    web_client_process_request(w);
+
+    if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
+        if(w->pollinfo_filecopy_slot == 0) {
+            debug(D_WEB_CLIENT, "%llu: FILECOPY DETECTED ON FD %d", w->id, pi->fd);
+
+            if (unlikely(w->ifd != -1 && w->ifd != w->ofd && w->ifd != fd)) {
+                // add a new socket to poll_events, with the same
+                debug(D_WEB_CLIENT, "%llu: CREATING FILECOPY SLOT ON FD %d", w->id, pi->fd);
+
+                POLLINFO *fpi = poll_add_fd(
+                        pi->p
+                        , w->ifd
+                        , 0
+                        , POLLINFO_FLAG_CLIENT_SOCKET
+                        , "FILENAME"
+                        , ""
+                        , web_server_file_add_callback
+                        , web_werver_file_del_callback
+                        , web_server_file_read_callback
+                        , web_server_file_write_callback
+                        , (void *) w
+                );
+
+                if(fpi)
+                    w->pollinfo_filecopy_slot = fpi->slot;
+                else {
+                    error("Failed to add filecopy fd. Closing client.");
+                    return -1;
+                }
+            }
+        }
+    }
+    else {
+        if(unlikely(w->ifd == fd && web_client_has_wait_receive(w)))
+            *events |= POLLIN;
+    }
+
+    if(unlikely(w->ofd == fd && web_client_has_wait_send(w)))
+        *events |= POLLOUT;
+
+    return web_server_check_client_status(w);
+}
+
+static int web_server_snd_callback(POLLINFO *pi, short int *events) {
+    worker_private->sends++;
+
+    struct web_client *w = (struct web_client *)pi->data;
+    int fd = pi->fd;
+
+    debug(D_WEB_CLIENT, "%llu: sending data on fd %d.", w->id, fd);
+
+    if(unlikely(web_client_send(w) < 0))
+        return -1;
+
+    if(unlikely(w->ifd == fd && web_client_has_wait_receive(w)))
+        *events |= POLLIN;
+
+    if(unlikely(w->ofd == fd && web_client_has_wait_send(w)))
+        *events |= POLLOUT;
+
+    return web_server_check_client_status(w);
+}
+
+static void web_server_tmr_callback(void *timer_data) {
+    worker_private = (struct web_server_static_threaded_worker *)timer_data;
+
+    static __thread RRDSET *st = NULL;
+    static __thread RRDDIM *rd_user = NULL, *rd_system = NULL;
+
+    if(unlikely(!st)) {
+        char id[100 + 1];
+        char title[100 + 1];
+
+        snprintfz(id, 100, "web_thread%d_cpu", worker_private->id + 1);
+        snprintfz(title, 100, "NetData web server thread No %d CPU usage", worker_private->id + 1);
+
+        st = rrdset_create_localhost(
+                "netdata"
+                , id
+                , NULL
+                , "web"
+                , "netdata.web_cpu"
+                , title
+                , "milliseconds/s"
+                , "web"
+                , "stats"
+                , 132000 + worker_private->id
+                , default_rrd_update_every
+                , RRDSET_TYPE_STACKED
+        );
+
+        rd_user   = rrddim_add(st, "user", NULL, 1, 1000, RRD_ALGORITHM_INCREMENTAL);
+        rd_system = rrddim_add(st, "system", NULL, 1, 1000, RRD_ALGORITHM_INCREMENTAL);
+    }
+    else
+        rrdset_next(st);
+
+    struct rusage rusage;
+    getrusage(RUSAGE_THREAD, &rusage);
+    rrddim_set_by_pointer(st, rd_user, rusage.ru_utime.tv_sec * 1000000ULL + rusage.ru_utime.tv_usec);
+    rrddim_set_by_pointer(st, rd_system, rusage.ru_stime.tv_sec * 1000000ULL + rusage.ru_stime.tv_usec);
+    rrdset_done(st);
+}
+
+// ----------------------------------------------------------------------------
+// web server worker thread
+
+static void socket_listen_main_static_threaded_worker_cleanup(void *ptr) {
+    worker_private = (struct web_server_static_threaded_worker *)ptr;
+
+    info("freeing local web clients cache...");
+    web_client_cache_destroy();
+
+    info("stopped after %zu connects, %zu disconnects (max concurrent %zu), %zu receptions and %zu sends",
+            worker_private->connected,
+            worker_private->disconnected,
+            worker_private->max_concurrent,
+            worker_private->receptions,
+            worker_private->sends
+    );
+
+    worker_private->running = 0;
+}
+
+void *socket_listen_main_static_threaded_worker(void *ptr) {
+    worker_private = (struct web_server_static_threaded_worker *)ptr;
+    worker_private->running = 1;
+
+    netdata_thread_cleanup_push(socket_listen_main_static_threaded_worker_cleanup, ptr);
+
+            poll_events(&api_sockets
+                        , web_server_add_callback
+                        , web_server_del_callback
+                        , web_server_rcv_callback
+                        , web_server_snd_callback
+                        , web_server_tmr_callback
+                        , web_allow_connections_from
+                        , NULL
+                        , web_client_first_request_timeout
+                        , web_client_timeout
+                        , default_rrd_update_every * 1000 // timer_milliseconds
+                        , ptr // timer_data
+                        , worker_private->max_sockets
+            );
+
+    netdata_thread_cleanup_pop(1);
+    return NULL;
+}
+
+
+// ----------------------------------------------------------------------------
+// web server main thread - also becomes a worker
+
+static void socket_listen_main_static_threaded_cleanup(void *ptr) {
+    struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
+    static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
+
+    int i, found = 0;
+    usec_t max = 2 * USEC_PER_SEC, step = 50000;
+
+    // we start from 1, - 0 is self
+    for(i = 1; i < static_threaded_workers_count; i++) {
+        if(static_workers_private_data[i].running) {
+            found++;
+            info("stopping worker %d", i + 1);
+            netdata_thread_cancel(static_workers_private_data[i].thread);
+        }
+        else
+            info("found stopped worker %d", i + 1);
+    }
+
+    while(found && max > 0) {
+        max -= step;
+        info("Waiting %d static web threads to finish...", found);
+        sleep_usec(step);
+        found = 0;
+
+        // we start from 1, - 0 is self
+        for(i = 1; i < static_threaded_workers_count; i++) {
+            if (static_workers_private_data[i].running)
+                found++;
+        }
+    }
+
+    if(found)
+        error("%d static web threads are taking too long to finish. Giving up.", found);
+
+    info("closing all web server sockets...");
+    listen_sockets_close(&api_sockets);
+
+    info("all static web threads stopped.");
+    static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
+}
+
+void *socket_listen_main_static_threaded(void *ptr) {
+    netdata_thread_cleanup_push(socket_listen_main_static_threaded_cleanup, ptr);
+            web_server_mode = WEB_SERVER_MODE_STATIC_THREADED;
+
+            if(!api_sockets.opened)
+                fatal("LISTENER: no listen sockets available.");
+
+            // 6 threads is the optimal value
+            // since 6 are the parallel connections browsers will do
+            // so, if the machine has more CPUs, avoid using resources unnecessarily
+            int def_thread_count = (processors > 6)?6:processors;
+
+            static_threaded_workers_count = config_get_number(CONFIG_SECTION_WEB, "web server threads", def_thread_count);
+            if(static_threaded_workers_count < 1) static_threaded_workers_count = 1;
+
+            size_t max_sockets = (size_t)config_get_number(CONFIG_SECTION_WEB, "web server max sockets", (long long int)(rlimit_nofile.rlim_cur / 2));
+
+            static_workers_private_data = callocz((size_t)static_threaded_workers_count, sizeof(struct web_server_static_threaded_worker));
+
+            web_server_is_multithreaded = (static_threaded_workers_count > 1);
+
+            int i;
+            for(i = 1; i < static_threaded_workers_count; i++) {
+                static_workers_private_data[i].id = i;
+                static_workers_private_data[i].max_sockets = max_sockets / static_threaded_workers_count;
+
+                char tag[50 + 1];
+                snprintfz(tag, 50, "WEB_SERVER[static%d]", i+1);
+
+                info("starting worker %d", i+1);
+                netdata_thread_create(&static_workers_private_data[i].thread, tag, NETDATA_THREAD_OPTION_DEFAULT, socket_listen_main_static_threaded_worker, (void *)&static_workers_private_data[i]);
+            }
+
+            // and the main one
+            static_workers_private_data[0].max_sockets = max_sockets / static_threaded_workers_count;
+            socket_listen_main_static_threaded_worker((void *)&static_workers_private_data[0]);
+
+    netdata_thread_cleanup_pop(1);
+    return NULL;
+}
diff --git a/web/server/static/static-threaded.h b/web/server/static/static-threaded.h
new file mode 100644
index 000000000..5f4862e5b
--- /dev/null
+++ b/web/server/static/static-threaded.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_WEB_SERVER_STATIC_THREADED_H
+#define NETDATA_WEB_SERVER_STATIC_THREADED_H
+
+#include "web/server/web_server.h"
+
+extern void *socket_listen_main_static_threaded(void *ptr);
+
+#endif //NETDATA_WEB_SERVER_STATIC_THREADED_H
diff --git a/src/web_client.c b/web/server/web_client.c
index 477fb3d57..282cfcd1a 100644
--- a/src/web_client.c
+++ b/web/server/web_client.c
@@ -1,4 +1,6 @@
-#include "common.h"
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "web_client.h"
 
 // this is an async I/O implementation of the web server request parser
 // it is used by all netdata web servers
@@ -53,6 +55,18 @@ static inline int web_client_uncrock_socket(struct web_client *w) {
     return 0;
 }
 
+static inline char *strip_control_characters(char *url) {
+    char *s = url;
+    if(!s) return "";
+
+    if(iscntrl(*s)) *s = ' ';
+    while(*++s) {
+        if(iscntrl(*s)) *s = ' ';
+    }
+
+    return url;
+}
+
 void web_client_request_done(struct web_client *w) {
     web_client_uncrock_socket(w);
 
@@ -120,7 +134,7 @@ void web_client_request_done(struct web_client *w) {
                    , dt_usec(&tv, &w->tv_ready) / 1000.0
                    , dt_usec(&tv, &w->tv_in) / 1000.0
                    , w->response.code
-                   , w->last_url
+                   , strip_control_characters(w->last_url)
         );
     }
 
@@ -329,10 +343,6 @@ int mysendfile(struct web_client *w, char *filename) {
     // skip leading slashes
     while (*filename == '/') filename++;
 
-    // if the filename contain known paths, skip them
-    if(strncmp(filename, WEB_PATH_FILE "/", strlen(WEB_PATH_FILE) + 1) == 0)
-        filename = &filename[strlen(WEB_PATH_FILE) + 1];
-
     // if the filename contains "strange" characters, refuse to serve it
     char *s;
     for(s = filename; *s ;s++) {
@@ -403,7 +413,7 @@ int mysendfile(struct web_client *w, char *filename) {
         if(errno == EBUSY || errno == EAGAIN) {
             error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
             w->response.data->contenttype = CT_TEXT_HTML;
-            buffer_sprintf(w->response.header, "Location: /" WEB_PATH_FILE "/%s\r\n", filename);
+            buffer_sprintf(w->response.header, "Location: /%s\r\n", filename);
             buffer_strcat(w->response.data, "File is currently busy, please try again later: ");
             buffer_strcat_htmlescape(w->response.data, webfilename);
             return 307;
@@ -550,31 +560,6 @@ void buffer_data_options2string(BUFFER *wb, uint32_t options) {
     }
 }
 
-const char *group_method2string(int group) {
-    switch(group) {
-        case GROUP_UNDEFINED:
-            return "";
-
-        case GROUP_AVERAGE:
-            return "average";
-
-        case GROUP_MIN:
-            return "min";
-
-        case GROUP_MAX:
-            return "max";
-
-        case GROUP_SUM:
-            return "sum";
-
-        case GROUP_INCREMENTAL_SUM:
-            return "incremental-sum";
-
-        default:
-            return "unknown-group-method";
-    }
-}
-
 static inline int check_host_and_call(RRDHOST *host, struct web_client *w, char *url, int (*func)(RRDHOST *, struct web_client *, char *)) {
     if(unlikely(host->rrd_memory_mode == RRD_MEMORY_MODE_NONE)) {
         buffer_flush(w->response.data);
@@ -898,7 +883,7 @@ static inline HTTP_VALIDATION http_request_validate(struct web_client *w) {
                 *ue = ' ';
                 
                 // copy the URL - we are going to overwrite parts of it
-                // FIXME -- we should avoid it
+                // TODO -- ideally we we should avoid copying buffers around
                 strncpyz(w->last_url, w->decoded_url, NETDATA_WEB_REQUEST_URL_SIZE);
 
                 w->header_parse_tries = 0;
@@ -1114,11 +1099,6 @@ static inline int web_client_process_url(RRDHOST *host, struct web_client *w, ch
     static uint32_t
             hash_api = 0,
             hash_netdata_conf = 0,
-            hash_data = 0,
-            hash_datasource = 0,
-            hash_graph = 0,
-            hash_list = 0,
-            hash_all_json = 0,
             hash_host = 0;
 
 #ifdef NETDATA_INTERNAL_CHECKS
@@ -1128,11 +1108,6 @@ static inline int web_client_process_url(RRDHOST *host, struct web_client *w, ch
     if(unlikely(!hash_api)) {
         hash_api = simple_hash("api");
         hash_netdata_conf = simple_hash("netdata.conf");
-        hash_data = simple_hash(WEB_PATH_DATA);
-        hash_datasource = simple_hash(WEB_PATH_DATASOURCE);
-        hash_graph = simple_hash(WEB_PATH_GRAPH);
-        hash_list = simple_hash("list");
-        hash_all_json = simple_hash("all.json");
         hash_host = simple_hash("host");
 #ifdef NETDATA_INTERNAL_CHECKS
         hash_exit = simple_hash("exit");
@@ -1154,26 +1129,6 @@ static inline int web_client_process_url(RRDHOST *host, struct web_client *w, ch
             debug(D_WEB_CLIENT_ACCESS, "%llu: host switch request ...", w->id);
             return web_client_switch_host(host, w, url);
         }
-        else if(unlikely(hash == hash_data && strcmp(tok, WEB_PATH_DATA) == 0)) {             // old API "data"
-            debug(D_WEB_CLIENT_ACCESS, "%llu: old API data request...", w->id);
-            return check_host_and_dashboard_acl_and_call(host, w, url, web_client_api_old_data_request_json);
-        }
-        else if(unlikely(hash == hash_datasource && strcmp(tok, WEB_PATH_DATASOURCE) == 0)) { // old API "datasource"
-            debug(D_WEB_CLIENT_ACCESS, "%llu: old API datasource request...", w->id);
-            return check_host_and_dashboard_acl_and_call(host, w, url, web_client_api_old_data_request_jsonp);
-        }
-        else if(unlikely(hash == hash_graph && strcmp(tok, WEB_PATH_GRAPH) == 0)) {           // old API "graph"
-            debug(D_WEB_CLIENT_ACCESS, "%llu: old API graph request...", w->id);
-            return check_host_and_dashboard_acl_and_call(host, w, url, web_client_api_old_graph_request);
-        }
-        else if(unlikely(hash == hash_list && strcmp(tok, "list") == 0)) {                    // old API "list"
-            debug(D_WEB_CLIENT_ACCESS, "%llu: old API list request...", w->id);
-            return check_host_and_dashboard_acl_and_call(host, w, url, web_client_api_old_list_request);
-        }
-        else if(unlikely(hash == hash_all_json && strcmp(tok, "all.json") == 0)) {            // old API "all.json"
-            debug(D_WEB_CLIENT_ACCESS, "%llu: old API all.json request...", w->id);
-            return check_host_and_dashboard_acl_and_call(host, w, url, web_client_api_old_all_json);
-        }
         else if(unlikely(hash == hash_netdata_conf && strcmp(tok, "netdata.conf") == 0)) {    // netdata.conf
             if(unlikely(!web_client_can_access_netdataconf(w)))
                 return web_client_permission_denied(w);
@@ -1638,6 +1593,8 @@ ssize_t web_client_read_file(struct web_client *w)
     ssize_t bytes = read(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t)left);
     if(likely(bytes > 0)) {
         size_t old = w->response.data->len;
+        (void)old;
+
         w->response.data->len += bytes;
         w->response.data->buffer[w->response.data->len] = '\0';
 
@@ -1691,6 +1648,8 @@ ssize_t web_client_receive(struct web_client *w)
         w->stats_received_bytes += bytes;
 
         size_t old = w->response.data->len;
+        (void)old;
+
         w->response.data->len += bytes;
         w->response.data->buffer[w->response.data->len] = '\0';
 
diff --git a/src/web_client.h b/web/server/web_client.h
index b495c37e1..b9e528fca 100644
--- a/src/web_client.h
+++ b/web/server/web_client.h
@@ -1,6 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 #ifndef NETDATA_WEB_CLIENT_H
 #define NETDATA_WEB_CLIENT_H 1
 
+#include "libnetdata/libnetdata.h"
+
 #ifdef NETDATA_WITH_ZLIB
 extern int web_enable_gzip,
         web_gzip_level,
@@ -70,6 +74,7 @@ typedef enum web_client_flags {
 #define web_client_set_tcp(w) web_client_flag_set(w, WEB_CLIENT_FLAG_TCP_CLIENT)
 #define web_client_set_unix(w) web_client_flag_set(w, WEB_CLIENT_FLAG_UNIX_CLIENT)
 #define web_client_check_unix(w) web_client_flag_check(w, WEB_CLIENT_FLAG_UNIX_CLIENT)
+#define web_client_check_tcp(w) web_client_flag_check(w, WEB_CLIENT_FLAG_TCP_CLIENT)
 
 #define web_client_is_corkable(w) web_client_flag_check(w, WEB_CLIENT_FLAG_TCP_CLIENT)
 
@@ -98,7 +103,7 @@ struct response {
     Bytef zbuffer[NETDATA_WEB_RESPONSE_ZLIB_CHUNK_SIZE]; // temporary buffer for storing compressed output
     size_t zsent;                   // the compressed bytes we have sent to the client
     size_t zhave;                   // the compressed bytes that we have received from zlib
-    int zinitialized:1;
+    unsigned int zinitialized:1;
 #endif /* NETDATA_WITH_ZLIB */
 
 };
@@ -179,11 +184,10 @@ extern ssize_t web_client_read_file(struct web_client *w);
 extern void web_client_process_request(struct web_client *w);
 extern void web_client_request_done(struct web_client *w);
 
-extern int web_client_api_request_v1_data_group(char *name, int def);
-extern const char *group_method2string(int group);
-
 extern void buffer_data_options2string(BUFFER *wb, uint32_t options);
 
 extern int mysendfile(struct web_client *w, char *filename);
 
+#include "daemon/common.h"
+
 #endif
diff --git a/web/server/web_client_cache.c b/web/server/web_client_cache.c
new file mode 100644
index 000000000..ab470560e
--- /dev/null
+++ b/web/server/web_client_cache.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#define WEB_SERVER_INTERNALS 1
+#include "web_client_cache.h"
+
+// ----------------------------------------------------------------------------
+// allocate and free web_clients
+
+static void web_client_zero(struct web_client *w) {
+    // zero everything about it - but keep the buffers
+
+    // remember the pointers to the buffers
+    BUFFER *b1 = w->response.data;
+    BUFFER *b2 = w->response.header;
+    BUFFER *b3 = w->response.header_output;
+
+    // empty the buffers
+    buffer_flush(b1);
+    buffer_flush(b2);
+    buffer_flush(b3);
+
+    freez(w->user_agent);
+
+    // zero everything
+    memset(w, 0, sizeof(struct web_client));
+
+    // restore the pointers of the buffers
+    w->response.data = b1;
+    w->response.header = b2;
+    w->response.header_output = b3;
+}
+
+static void web_client_free(struct web_client *w) {
+    buffer_free(w->response.header_output);
+    buffer_free(w->response.header);
+    buffer_free(w->response.data);
+    freez(w->user_agent);
+    freez(w);
+}
+
+static struct web_client *web_client_alloc(void) {
+    struct web_client *w = callocz(1, sizeof(struct web_client));
+    w->response.data = buffer_create(NETDATA_WEB_RESPONSE_INITIAL_SIZE);
+    w->response.header = buffer_create(NETDATA_WEB_RESPONSE_HEADER_SIZE);
+    w->response.header_output = buffer_create(NETDATA_WEB_RESPONSE_HEADER_SIZE);
+    return w;
+}
+
+// ----------------------------------------------------------------------------
+// web clients caching
+
+// When clients connect and disconnect, avoid allocating and releasing memory.
+// Instead, when new clients get connected, reuse any memory previously allocated
+// for serving web clients that are now disconnected.
+
+// The size of the cache is adaptive. It caches the structures of 2x
+// the number of currently connected clients.
+
+// Comments per server:
+// SINGLE-THREADED : 1 cache is maintained
+// MULTI-THREADED  : 1 cache is maintained
+// STATIC-THREADED : 1 cache for each thred of the web server
+
+__thread struct clients_cache web_clients_cache = {
+        .pid = 0,
+        .used = NULL,
+        .used_count = 0,
+        .avail = NULL,
+        .avail_count = 0,
+        .allocated = 0,
+        .reused = 0
+};
+
+inline void web_client_cache_verify(int force) {
+#ifdef NETDATA_INTERNAL_CHECKS
+    static __thread size_t count = 0;
+    count++;
+
+    if(unlikely(force || count > 1000)) {
+        count = 0;
+
+        struct web_client *w;
+        size_t used = 0, avail = 0;
+        for(w = web_clients_cache.used; w ; w = w->next) used++;
+        for(w = web_clients_cache.avail; w ; w = w->next) avail++;
+
+        info("web_client_cache has %zu (%zu) used and %zu (%zu) available clients, allocated %zu, reused %zu (hit %zu%%)."
+             , used, web_clients_cache.used_count
+             , avail, web_clients_cache.avail_count
+             , web_clients_cache.allocated
+             , web_clients_cache.reused
+             , (web_clients_cache.allocated + web_clients_cache.reused)?(web_clients_cache.reused * 100 / (web_clients_cache.allocated + web_clients_cache.reused)):0
+        );
+    }
+#else
+    if(unlikely(force)) {
+        info("web_client_cache has %zu used and %zu available clients, allocated %zu, reused %zu (hit %zu%%)."
+             , web_clients_cache.used_count
+             , web_clients_cache.avail_count
+             , web_clients_cache.allocated
+             , web_clients_cache.reused
+             , (web_clients_cache.allocated + web_clients_cache.reused)?(web_clients_cache.reused * 100 / (web_clients_cache.allocated + web_clients_cache.reused)):0
+            );
+    }
+#endif
+}
+
+// destroy the cache and free all the memory it uses
+void web_client_cache_destroy(void) {
+#ifdef NETDATA_INTERNAL_CHECKS
+    if(unlikely(web_clients_cache.pid != 0 && web_clients_cache.pid != gettid()))
+        error("Oops! wrong thread accessing the cache. Expected %d, found %d", (int)web_clients_cache.pid, (int)gettid());
+
+    web_client_cache_verify(1);
+#endif
+
+    netdata_thread_disable_cancelability();
+
+    struct web_client *w, *t;
+
+    w = web_clients_cache.used;
+    while(w) {
+        t = w;
+        w = w->next;
+        web_client_free(t);
+    }
+    web_clients_cache.used = NULL;
+    web_clients_cache.used_count = 0;
+
+    w = web_clients_cache.avail;
+    while(w) {
+        t = w;
+        w = w->next;
+        web_client_free(t);
+    }
+    web_clients_cache.avail = NULL;
+    web_clients_cache.avail_count = 0;
+
+    netdata_thread_enable_cancelability();
+}
+
+struct web_client *web_client_get_from_cache_or_allocate() {
+
+#ifdef NETDATA_INTERNAL_CHECKS
+    if(unlikely(web_clients_cache.pid == 0))
+        web_clients_cache.pid = gettid();
+
+    if(unlikely(web_clients_cache.pid != 0 && web_clients_cache.pid != gettid()))
+        error("Oops! wrong thread accessing the cache. Expected %d, found %d", (int)web_clients_cache.pid, (int)gettid());
+#endif
+
+    netdata_thread_disable_cancelability();
+
+    struct web_client *w = web_clients_cache.avail;
+
+    if(w) {
+        // get it from avail
+        if (w == web_clients_cache.avail) web_clients_cache.avail = w->next;
+        if(w->prev) w->prev->next = w->next;
+        if(w->next) w->next->prev = w->prev;
+        web_clients_cache.avail_count--;
+        web_client_zero(w);
+        web_clients_cache.reused++;
+    }
+    else {
+        // allocate it
+        w = web_client_alloc();
+        web_clients_cache.allocated++;
+    }
+
+    // link it to used web clients
+    if (web_clients_cache.used) web_clients_cache.used->prev = w;
+    w->next = web_clients_cache.used;
+    w->prev = NULL;
+    web_clients_cache.used = w;
+    web_clients_cache.used_count++;
+
+    // initialize it
+    w->id = web_client_connected();
+    w->mode = WEB_CLIENT_MODE_NORMAL;
+
+    netdata_thread_enable_cancelability();
+
+    return w;
+}
+
+void web_client_release(struct web_client *w) {
+#ifdef NETDATA_INTERNAL_CHECKS
+    if(unlikely(web_clients_cache.pid != 0 && web_clients_cache.pid != gettid()))
+        error("Oops! wrong thread accessing the cache. Expected %d, found %d", (int)web_clients_cache.pid, (int)gettid());
+
+    if(unlikely(w->running))
+        error("%llu: releasing web client from %s port %s, but it still running.", w->id, w->client_ip, w->client_port);
+#endif
+
+    debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
+
+    web_server_log_connection(w, "DISCONNECTED");
+    web_client_request_done(w);
+    web_client_disconnected();
+
+    netdata_thread_disable_cancelability();
+
+    if(web_server_mode != WEB_SERVER_MODE_STATIC_THREADED) {
+        if (w->ifd != -1) close(w->ifd);
+        if (w->ofd != -1 && w->ofd != w->ifd) close(w->ofd);
+        w->ifd = w->ofd = -1;
+    }
+
+    // unlink it from the used
+    if (w == web_clients_cache.used) web_clients_cache.used = w->next;
+    if(w->prev) w->prev->next = w->next;
+    if(w->next) w->next->prev = w->prev;
+    web_clients_cache.used_count--;
+
+    if(web_clients_cache.avail_count >= 2 * web_clients_cache.used_count) {
+        // we have too many of them - free it
+        web_client_free(w);
+    }
+    else {
+        // link it to the avail
+        if (web_clients_cache.avail) web_clients_cache.avail->prev = w;
+        w->next = web_clients_cache.avail;
+        w->prev = NULL;
+        web_clients_cache.avail = w;
+        web_clients_cache.avail_count++;
+    }
+
+    netdata_thread_enable_cancelability();
+}
+
diff --git a/web/server/web_client_cache.h b/web/server/web_client_cache.h
new file mode 100644
index 000000000..f63888000
--- /dev/null
+++ b/web/server/web_client_cache.h
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_WEB_CLIENT_CACHE_H
+#define NETDATA_WEB_CLIENT_CACHE_H
+
+#include "libnetdata/libnetdata.h"
+#include "web_client.h"
+
+struct clients_cache {
+    pid_t pid;
+
+    struct web_client *used;    // the structures of the currently connected clients
+    size_t used_count;          // the count the currently connected clients
+
+    struct web_client *avail;   // the cached structures, available for future clients
+    size_t avail_count;         // the number of cached structures
+
+    size_t reused;              // the number of re-uses
+    size_t allocated;           // the number of allocations
+};
+
+extern __thread struct clients_cache web_clients_cache;
+
+extern void web_client_release(struct web_client *w);
+extern struct web_client *web_client_get_from_cache_or_allocate();
+extern void web_client_cache_destroy(void);
+extern void web_client_cache_verify(int force);
+
+#include "web_server.h"
+
+#endif //NETDATA_WEB_CLIENT_CACHE_H
diff --git a/web/server/web_server.c b/web/server/web_server.c
new file mode 100644
index 000000000..5a68b125e
--- /dev/null
+++ b/web/server/web_server.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#define WEB_SERVER_INTERNALS 1
+#include "web_server.h"
+
+// this file includes 3 web servers:
+//
+// 1. single-threaded, based on select()
+// 2. multi-threaded, based on poll() that spawns threads to handle the requests, based on select()
+// 3. static-threaded, based on poll() using a fixed number of threads (configured at netdata.conf)
+
+WEB_SERVER_MODE web_server_mode = WEB_SERVER_MODE_STATIC_THREADED;
+
+// --------------------------------------------------------------------------------------
+
+WEB_SERVER_MODE web_server_mode_id(const char *mode) {
+    if(!strcmp(mode, "none"))
+        return WEB_SERVER_MODE_NONE;
+    else if(!strcmp(mode, "single") || !strcmp(mode, "single-threaded"))
+        return WEB_SERVER_MODE_SINGLE_THREADED;
+    else if(!strcmp(mode, "static") || !strcmp(mode, "static-threaded"))
+        return WEB_SERVER_MODE_STATIC_THREADED;
+    else // if(!strcmp(mode, "multi") || !strcmp(mode, "multi-threaded"))
+        return WEB_SERVER_MODE_MULTI_THREADED;
+}
+
+const char *web_server_mode_name(WEB_SERVER_MODE id) {
+    switch(id) {
+        case WEB_SERVER_MODE_NONE:
+            return "none";
+
+        case WEB_SERVER_MODE_SINGLE_THREADED:
+            return "single-threaded";
+
+        case WEB_SERVER_MODE_STATIC_THREADED:
+            return "static-threaded";
+
+        default:
+        case WEB_SERVER_MODE_MULTI_THREADED:
+            return "multi-threaded";
+    }
+}
+
+// --------------------------------------------------------------------------------------
+// API sockets
+
+LISTEN_SOCKETS api_sockets = {
+        .config          = &netdata_config,
+        .config_section  = CONFIG_SECTION_WEB,
+        .default_bind_to = "*",
+        .default_port    = API_LISTEN_PORT,
+        .backlog         = API_LISTEN_BACKLOG
+};
+
+int api_listen_sockets_setup(void) {
+    int socks = listen_sockets_setup(&api_sockets);
+
+    if(!socks)
+        fatal("LISTENER: Cannot listen on any API socket. Exiting...");
+
+    return socks;
+}
+
+
+// --------------------------------------------------------------------------------------
+// access lists
+
+SIMPLE_PATTERN *web_allow_connections_from = NULL;
+SIMPLE_PATTERN *web_allow_streaming_from = NULL;
+SIMPLE_PATTERN *web_allow_netdataconf_from = NULL;
+
+// WEB_CLIENT_ACL
+SIMPLE_PATTERN *web_allow_dashboard_from = NULL;
+SIMPLE_PATTERN *web_allow_registry_from = NULL;
+SIMPLE_PATTERN *web_allow_badges_from = NULL;
+
+void web_client_update_acl_matches(struct web_client *w) {
+    w->acl = WEB_CLIENT_ACL_NONE;
+
+    if(!web_allow_dashboard_from || simple_pattern_matches(web_allow_dashboard_from, w->client_ip))
+        w->acl |= WEB_CLIENT_ACL_DASHBOARD;
+
+    if(!web_allow_registry_from || simple_pattern_matches(web_allow_registry_from, w->client_ip))
+        w->acl |= WEB_CLIENT_ACL_REGISTRY;
+
+    if(!web_allow_badges_from || simple_pattern_matches(web_allow_badges_from, w->client_ip))
+        w->acl |= WEB_CLIENT_ACL_BADGE;
+}
+
+
+// --------------------------------------------------------------------------------------
+
+void web_server_log_connection(struct web_client *w, const char *msg) {
+    log_access("%llu: %d '[%s]:%s' '%s'", w->id, gettid(), w->client_ip, w->client_port, msg);
+}
+
+// --------------------------------------------------------------------------------------
+
+void web_client_initialize_connection(struct web_client *w) {
+    int flag = 1;
+
+    if(unlikely(web_client_check_tcp(w) && setsockopt(w->ifd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0))
+        debug(D_WEB_CLIENT, "%llu: failed to enable TCP_NODELAY on socket fd %d.", w->id, w->ifd);
+
+    flag = 1;
+    if(unlikely(setsockopt(w->ifd, SOL_SOCKET, SO_KEEPALIVE, (char *) &flag, sizeof(int)) != 0))
+        debug(D_WEB_CLIENT, "%llu: failed to enable SO_KEEPALIVE on socket fd %d.", w->id, w->ifd);
+
+    web_client_update_acl_matches(w);
+
+    w->origin[0] = '*'; w->origin[1] = '\0';
+    w->cookie1[0] = '\0'; w->cookie2[0] = '\0';
+    freez(w->user_agent); w->user_agent = NULL;
+
+    web_client_enable_wait_receive(w);
+
+    web_server_log_connection(w, "CONNECTED");
+
+    web_client_cache_verify(0);
+}
+
+struct web_client *web_client_create_on_listenfd(int listener) {
+    struct web_client *w;
+
+    w = web_client_get_from_cache_or_allocate();
+    w->ifd = w->ofd = accept_socket(listener, SOCK_NONBLOCK, w->client_ip, sizeof(w->client_ip), w->client_port, sizeof(w->client_port), web_allow_connections_from);
+
+    if(unlikely(!*w->client_ip))   strcpy(w->client_ip,   "-");
+    if(unlikely(!*w->client_port)) strcpy(w->client_port, "-");
+
+    if (w->ifd == -1) {
+        if(errno == EPERM)
+            web_server_log_connection(w, "ACCESS DENIED");
+        else {
+            web_server_log_connection(w, "CONNECTION FAILED");
+            error("%llu: Failed to accept new incoming connection.", w->id);
+        }
+
+        web_client_release(w);
+        return NULL;
+    }
+
+    web_client_initialize_connection(w);
+    return(w);
+}
+
diff --git a/src/web_server.h b/web/server/web_server.h
index 7492547ef..7777c8978 100644
--- a/src/web_server.h
+++ b/web/server/web_server.h
@@ -1,10 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 #ifndef NETDATA_WEB_SERVER_H
 #define NETDATA_WEB_SERVER_H 1
 
-#define WEB_PATH_FILE               "file"
-#define WEB_PATH_DATA               "data"
-#define WEB_PATH_DATASOURCE         "datasource"
-#define WEB_PATH_GRAPH              "graph"
+#include "libnetdata/libnetdata.h"
+#include "web_client.h"
 
 #ifndef API_LISTEN_PORT
 #define API_LISTEN_PORT 19999
@@ -33,14 +33,28 @@ extern WEB_SERVER_MODE web_server_mode;
 extern WEB_SERVER_MODE web_server_mode_id(const char *mode);
 extern const char *web_server_mode_name(WEB_SERVER_MODE id);
 
-extern void *socket_listen_main_multi_threaded(void *ptr);
-extern void *socket_listen_main_single_threaded(void *ptr);
-extern void *socket_listen_main_static_threaded(void *ptr);
 extern int api_listen_sockets_setup(void);
 
 #define DEFAULT_TIMEOUT_TO_RECEIVE_FIRST_WEB_REQUEST 60
 #define DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS 60
 extern int web_client_timeout;
 extern int web_client_first_request_timeout;
+extern long web_client_streaming_rate_t;
+
+#ifdef WEB_SERVER_INTERNALS
+extern LISTEN_SOCKETS api_sockets;
+extern void web_client_update_acl_matches(struct web_client *w);
+extern void web_server_log_connection(struct web_client *w, const char *msg);
+extern void web_client_initialize_connection(struct web_client *w);
+extern struct web_client *web_client_create_on_listenfd(int listener);
+
+#include "web_client_cache.h"
+#endif // WEB_SERVER_INTERNALS
+
+#include "single/single-threaded.h"
+#include "multi/multi-threaded.h"
+#include "static/static-threaded.h"
+
+#include "daemon/common.h"
 
 #endif /* NETDATA_WEB_SERVER_H */