From 5c8f9c52e3f2944f01cea621326532e058a225f7 Mon Sep 17 00:00:00 2001
From: Michael Barton <mike@weirdlooking.com>
Date: Wed, 14 Nov 2012 03:12:21 -0800
Subject: [PATCH] check response status in WSGIContext._app_call

Only re-chain response iter if start_response hasn't been called yet.

Change-Id: I9670f49419104fb8f949e6edc12d9047d1289cde
---
 swift/common/wsgi.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/swift/common/wsgi.py b/swift/common/wsgi.py
index bf62cbebac..150afeebe7 100644
--- a/swift/common/wsgi.py
+++ b/swift/common/wsgi.py
@@ -262,7 +262,11 @@ class WSGIContext(object):
         """
         Ensures start_response has been called before returning.
         """
-        resp = iter(self.app(env, self._start_response))
+        resp = self.app(env, self._start_response)
+        # if start_response has been called, just return the iter
+        if self._response_status is not None:
+            return resp
+        resp = iter(resp)
         try:
             first_chunk = resp.next()
         except StopIteration: