[websockets] add latest websockets support

Author: indutny

Diff for: lib/node-http-proxy/http-proxy.js

@@ -393,7 +393,7 @@ HttpProxy.prototype.proxyWebSocketRequest = function (req, socket, head, buffer)
   //
   // Setup the incoming client socket.
   //
-  _socket(socket);
+  _socket(socket, true);
 
   //
   // On `upgrade` from the Agent socket, listen to
@@ -663,7 +663,12 @@ HttpProxy.prototype.proxyWebSocketRequest = function (req, socket, head, buffer)
     // request. This is small, and there's only ever one of 
     // it; no need for pause/resume.
     //
+    // XXX This is very wrong and should be fixed in node's core
+    //
     reverseProxy.write(head);
+    if (head && head.length === 0) {
+      reverseProxy._send('');
+    }
   }
   catch (ex) {
     return proxyError(ex);