diff --git a/lib/http-proxy/passes/ws-incoming.js b/lib/http-proxy/passes/ws-incoming.js
index 1bc7869..9d39703 100644
--- a/lib/http-proxy/passes/ws-incoming.js
+++ b/lib/http-proxy/passes/ws-incoming.js
@@ -89,6 +89,10 @@ var passes = exports;
     );
     // Error Handler
     proxyReq.on('error', onOutgoingError);
+    proxyReq.on('response', function (res) {
+      // if upgrade event isn't going to happen, close the socket
+      if (!res.upgrade) socket.end();
+    });
 
     proxyReq.on('upgrade', function(proxyRes, proxySocket, proxyHead) {
       proxySocket.on('error', onOutgoingError);