bpo-30904: Removed duplicated Host: header. (GH-4465) (#4468)

(cherry picked from commit e96ba183c43ad6633b5d014b3dc57433e2802faf)

diff --git a/Lib/logging/handlers.py b/Lib/logging/handlers.py
index daa71abd785bec0eb1d40d21c93b0b77c9359f15..11ebcf124c3f93575021babba45148920a38988e 100644 (file)
--- 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")