Fix overwritten Accept header when proxy is used (#916725)

python-urllib3-accept-header-for-proxy.patch

@@ -0,0 +1,28 @@
+From ea36acfc8a997a19ba1ead58de0d1f01e9eb540f Mon Sep 17 00:00:00 2001
+From: kevin <kevinbjiang@gmail.com>
+Date: Thu, 30 Aug 2012 00:14:12 -0400
+Subject: [PATCH 1/4] Fix overwritten Accept header when proxy is used
+
+When a request specifies both an Accept header and a proxy server, the
+Accept header value is overwritten.
+---
+ urllib3/poolmanager.py |    3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/urllib3/poolmanager.py b/urllib3/poolmanager.py
+index 8f5b54c..7d7d6e4 100644
+--- a/urllib3/poolmanager.py
++++ b/urllib3/poolmanager.py
+@@ -141,7 +141,8 @@ def _set_proxy_headers(self, headers=None):
+         headers = headers or {}
+ 
+         # Same headers are curl passes for --proxy1.0
+-        headers['Accept'] = '*/*'
++        if 'Accept' not in headers:
++            headers['Accept'] = '*/*'
+         headers['Proxy-Connection'] = 'Keep-Alive'
+ 
+         return headers
+-- 
+1.7.10
+