From e96ba183c43ad6633b5d014b3dc57433e2802faf Mon Sep 17 00:00:00 2001
From: Vinay Sajip <vinay_sajip@yahoo.co.uk>
Date: Sun, 19 Nov 2017 18:36:17 +0000
Subject: [PATCH] bpo-30904: Removed duplicated Host: header. (#4465)

---
 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 d1871acfa4b..974c089d40e 100644
--- a/Lib/logging/handlers.py
+++ b/Lib/logging/handlers.py
@@ -1180,7 +1180,9 @@ 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")