From b071a5e838a0e84c4e8a60448fbd40e8a7e5c882 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Sun, 19 Nov 2017 11:16:17 -0800
Subject: bpo-30904: Removed duplicated Host: header. (GH-4465) (#4468)

(cherry picked from commit e96ba183c43ad6633b5d014b3dc57433e2802faf)
---
 Lib/logging/handlers.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Lib/logging/handlers.py b/Lib/logging/handlers.py
index daa71ab..11ebcf1 100644
--- a/Lib/logging/handlers.py
+++ b/Lib/logging/handlers.py
@@ -1183,7 +1183,9 @@ class HTTPHandler(logging.Handler):
             i = host.find(":")
             if i >= 0:
                 host = host[:i]
-            h.putheader("Host", host)
+            # See issue #30904: putrequest call above already adds this header
+            # on Python 3.x.
+            # h.putheader("Host", host)
             if self.method == "POST":
                 h.putheader("Content-type",
                             "application/x-www-form-urlencoded")
-- 
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