From 4d7154a31a1e228c5ebd83fa9a448e6f2a044b0c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miroslav=20Bajto=C5=A1?= <mbajtos@cz.ibm.com>
Date: Tue, 3 May 2016 16:03:48 +0200
Subject: [PATCH] app: send port:0 instead of port:undefined

Node v6 no longer supports port:undefined, this commit is fixing
app.listen() to correctly send port:0 when no port is specified.
---
 lib/application.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/application.js b/lib/application.js
index 5667e0eb..a98bd331 100644
--- a/lib/application.js
+++ b/lib/application.js
@@ -565,7 +565,11 @@ app.listen = function(cb) {
       (arguments.length == 1 && typeof arguments[0] == 'function');
 
   if (useAppConfig) {
-    server.listen(this.get('port'), this.get('host'), cb);
+    var port = this.get('port');
+    // NOTE(bajtos) port:undefined no longer works on node@6,
+    // we must pass port:0 explicitly
+    if (port === undefined) port = 0;
+    server.listen(port, this.get('host'), cb);
   } else {
     server.listen.apply(server, arguments);
   }