[fix] Change variable references for Websockets, bugs found from using wsbench

Author: indexzero

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

@@ -579,10 +579,10 @@ HttpProxy.prototype.proxyWebSocketRequest = function (req, socket, head, options
 
     // Detach event listeners from reverseProxy
     function detach() {
-      reverseProxy.removeListener('close', listeners._r_close);
+      reverseProxy.removeListener('end', listeners._r_close);
       reverseProxy.removeListener('data', listeners._r_data);
       out.incoming.socket.removeListener('data', listeners._data);
-      out.incoming.socket.removeListener('close', listeners._close);
+      out.incoming.socket.removeListener('end', listeners._close);
     }
 
     // Hook disconnections
@@ -591,7 +591,7 @@ HttpProxy.prototype.proxyWebSocketRequest = function (req, socket, head, options
       detach();
     });
 
-    socket.on('end', listeners._close = function() {
+    out.incoming.socket.on('end', listeners._close = function() {
       reverseProxy.end();
       detach();
     });