From bc12ca39394f9aeed3e3047f59035ba48afa2885 Mon Sep 17 00:00:00 2001
From: Phil Jackson <phil@shellarchive.co.uk>
Date: Tue, 10 Sep 2013 15:16:06 +0100
Subject: [PATCH] Emit middlewareError when on middleware error.

Now it's possible to pass an Error object to next() and have it handled
in a custom way that's suitable to your application.
---
 lib/node-http-proxy.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/node-http-proxy.js b/lib/node-http-proxy.js
index 956a5f3d3..c1275ab39 100644
--- a/lib/node-http-proxy.js
+++ b/lib/node-http-proxy.js
@@ -294,6 +294,10 @@ exports.stack = function stack (middlewares, proxy) {
     handle = function (req, res) {
       var next = function (err) {
         if (err) {
+          if (! proxy.emit('middlewareError', err, res, req)) {
+            console.error('Error in middleware(s): %s', err.stack);
+          }
+
           if (res._headerSent) {
             res.destroy();
           }
@@ -303,7 +307,6 @@ exports.stack = function stack (middlewares, proxy) {
             res.end('Internal Server Error');
           }
 
-          console.error('Error in middleware(s): %s', err.stack);
           return;
         }