[fix] Handle socket errors

Author: mmalecki

lib/node-http-proxy/http-proxy.js

@@ -314,6 +314,9 @@ HttpProxy.prototype.proxyRequest = function (req, res, buffer) {
   // Handle 'error' events from the `reverseProxy`.
   //
   reverseProxy.once('error', proxyError);
+  reverseProxy.once('socket', function (socket) {
+    socket.once('error', proxyError);
+  });
 
   //
   // If `req` is aborted, we abort our `reverseProxy` request as well.
@@ -724,6 +727,9 @@ HttpProxy.prototype.proxyWebSocketRequest = function (req, socket, head, buffer)
   });
 
   reverseProxy.on('error', proxyError);
+  reverseProxy.once('socket', function (socket) {
+    socket.once('error', proxyError);
+  });
 
   try {
     //