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[jetty-users] Enabling Websocket compression

Hi Folks,

 

I’m using Jetty 9.2.13.v20150730 in an embedded setup, and wish to test out websocket compression.  I know that historically the standard hasn’t been stable, and there have been some implementation bugs, but it looks like things have been fixed and some time has passed.  I figure that testing is the way forward.

 

Looking at websocket upgrade request and response headers in wireshark, it looks like permessage-deflate is being offered by Chrome, but being ignored by Jetty.  I think this is because of this bug and change which disabled the websocket extensions by default:  

 

https://bugs.eclipse.org/bugs/show_bug.cgi?id=431459

http://git.eclipse.org/c/jetty/org.eclipse.jetty.project.git/commit/?h=jetty-9.1.x&id=bfbd2a7d8f18b57f2b527b6d07949d41dfd6e31d

 

I’d like to re-enable those extensions, but don’t know quite how to achieve this and can’t find a good reference.  From the above bug, it suggests the following:

 

“public void configure(WebSocketServletFactory factory)

{

    factory.getExtensionFactory().register(

      "permessage-deflate",PerMessageDeflateExtension.class);

    factory.register(MySocket.class)

}

 

This applies to use of websocket via the WebSocketServlet (or WebSocketHandler), using the Jetty WebSocket API.”

 

However, in my setup I’m not extending a WebSocketServlet, instead I’m using annotated POJOs which use @OnOpen, @OnMessage etc… to handle the websocket messages very nicely.  Therefore I’m not sure how or where I can access the WebsocketServerFactory to get at the ExtensionFactory to make the required registrations.

 

I configure the server like this:

 

        Server        server = new Server(PORT);                       

        WebAppContext wac = new WebAppContext(warFile.getAbsolutePath(), "/");

               

        ClassList classlist = ClassList.setServerDefault(server);

        classlist.addBefore("org.eclipse.jetty.webapp.JettyWebXmlConfiguration", "org.eclipse.jetty.annotations.AnnotationConfiguration");

        

        wac.setAttribute("org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern",

                            ".*/[^/]*servlet-api-[^/]*\\.jar$|.*/javax.servlet.jsp.jstl-.*\\.jar$|.*/[^/]*taglibs.*\\.jar$");

                 

        ServerContainer wscontainer = WebSocketServerContainerInitializer.configureContext(wac);

 

        wscontainer.addEndpoint(MyDataSourceWebSocketServlet.class);

      

        server.start();

 

Any pointers or suggestions would be gratefully received.

 

Kind Regards,

 

Mike

 

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