From 3f2e6f15d64d81633b1fc0b308afc0d6e9026b61 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Mon, 26 Feb 2018 16:50:11 +0200
Subject: Revert unneccessary changes made in bpo-30296 and apply other
 improvements. (GH-2624)

---
 Lib/urllib/request.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'Lib/urllib/request.py')

diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index 2b769421c56..5b962f7dc20 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -1286,7 +1286,8 @@ class AbstractHTTPHandler(BaseHandler):
         h.set_debuglevel(self._debuglevel)
 
         headers = dict(req.unredirected_hdrs)
-        headers.update((k, v) for k, v in req.headers.items() if k not in headers)
+        headers.update({k: v for k, v in req.headers.items()
+                        if k not in headers})
 
         # TODO(jhylton): Should this be redesigned to handle
         # persistent connections?
-- 
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