commit f97406be4c0a02c1501c7ab8bc8ef3850eddb962
author Christian Heimes <christian@python.org> Fri Nov 13 16:37:52 2020 +0100
committer GitHub <noreply@github.com> Fri Nov 13 16:37:52 2020 +0100
tree 9fe83b52d120269d64fec6e877bb9576124bbd57
parent 09490a109faaee9cc393b52742a8575c116c56ba

bpo-40968: Send http/1.1 ALPN extension (#20959)

Signed-off-by: Christian Heimes <christian@python.org>

Lib/urllib/request.py

diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index a8c870b..39974d9 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -202,6 +202,8 @@ def urlopen(url, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
         context = ssl.create_default_context(ssl.Purpose.SERVER_AUTH,
                                              cafile=cafile,
                                              capath=capath)
+        # send ALPN extension to indicate HTTP/1.1 protocol
+        context.set_alpn_protocols(['http/1.1'])
         https_handler = HTTPSHandler(context=context)
         opener = build_opener(https_handler)
     elif context: