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bpo-38907: Suppress any exception when attempting to set V6ONLY. #17864

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Merged
jaraco merged 1 commit into from
Jan 6, 2020
Merged

bpo-38907: Suppress any exception when attempting to set V6ONLY. #17864

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6 changes: 5 additions & 1 deletion Lib/http/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -103,6 +103,7 @@
import sys
import time
import urllib.parse
import contextlib
from functools import partial

from http import HTTPStatus
Expand Down Expand Up @@ -1286,7 +1287,10 @@ def test(HandlerClass=BaseHTTPRequestHandler,
# ensure dual-stack is not disabled; ref #38907
class DualStackServer(ThreadingHTTPServer):
def server_bind(self):
self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0)
# suppress exception when protocol is IPv4
with contextlib.suppress(Exception):
self.socket.setsockopt(
socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0)
return super().server_bind()

test(
Expand Down