HTTPCLIENT-973: Introduce httpclient5-websocket H1 upgrade client and HTTP/2 WebSocket client support (RFC 8441)

Author: arturobernalg

httpclient5-testing/pom.xml

@@ -77,6 +77,11 @@
       <artifactId>httpclient5-fluent</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.apache.httpcomponents.client5</groupId>
+      <artifactId>httpclient5-websocket</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>com.kohlschutter.junixsocket</groupId>
       <artifactId>junixsocket-core</artifactId>