From 60ab030e528f91ce643fa937bcfc41ea2017083d Mon Sep 17 00:00:00 2001
From: Kyle Kelley <kyle.kelley@rackspace.com>
Date: Wed, 22 Jan 2014 18:21:02 -0600
Subject: [PATCH] Verify that headers are set, explicitly

---
 IPython/html/base/zmqhandlers.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/IPython/html/base/zmqhandlers.py b/IPython/html/base/zmqhandlers.py
index 1b741ae9c..6f34c96bf 100644
--- a/IPython/html/base/zmqhandlers.py
+++ b/IPython/html/base/zmqhandlers.py
@@ -48,6 +48,9 @@ class ZMQStreamHandler(websocket.WebSocketHandler):
         origin_header = self.request.headers.get("Origin")
         host = self.request.headers.get("Host")
 
+        if(origin_header == None or host == None):
+            return True
+
         parsed_origin = urlparse(origin_header)
         origin = parsed_origin.netloc