Put the arguments the right way around in emitter.

Author: philjackson

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

@@ -294,7 +294,7 @@ exports.stack = function stack (middlewares, proxy) {
     handle = function (req, res) {
       var next = function (err) {
         if (err) {
-          if (! proxy.emit('middlewareError', err, res, req)) {
+          if (! proxy.emit('middlewareError', err, req, res)) {
             console.error('Error in middleware(s): %s', err.stack);
           }