WebSocket and Dynamic Thread Pool support (#2368)

* WebSocket support

* Validate selected subprotocol in WebSocket handshake

* Fix problem with a Unit test

* Dynamic Thread Pool support

* Fix race condition in new Dynamic ThreadPool

Author: yhirose

.github/workflows/test.yaml

@@ -103,6 +103,11 @@ jobs:
       - name: run fuzz test target
         if: matrix.tls_backend == 'openssl'
         run: cd test && make fuzz_test
+      - name: build and run WebSocket heartbeat test
+        if: matrix.tls_backend == 'openssl'
+        run: cd test && make test_websocket_heartbeat && ./test_websocket_heartbeat
+      - name: build and run ThreadPool test
+        run: cd test && make test_thread_pool && ./test_thread_pool
 
   macos:
     runs-on: macos-latest
@@ -132,6 +137,11 @@ jobs:
       - name: run fuzz test target
         if: matrix.tls_backend == 'openssl'
         run: cd test && make fuzz_test
+      - name: build and run WebSocket heartbeat test
+        if: matrix.tls_backend == 'openssl'
+        run: cd test && make test_websocket_heartbeat && ./test_websocket_heartbeat
+      - name: build and run ThreadPool test
+        run: cd test && make test_thread_pool && ./test_thread_pool
 
   windows:
     runs-on: windows-latest

.gitignore

@@ -29,6 +29,8 @@ example/server_and_client
 !example/server_and_client.*
 example/accept_header
 !example/accept_header.*
+example/wsecho
+!example/wsecho.*
 example/*.pem
 test/httplib.cc
 test/httplib.h
@@ -41,6 +43,8 @@ test/test_proxy_mbedtls
 test/test_split
 test/test_split_mbedtls
 test/test_split_no_tls
+test/test_websocket_heartbeat
+test/test_thread_pool
 test/test.xcodeproj/xcuser*
 test/test.xcodeproj/*/xcuser*
 test/*.o