bpo-38907: Suppress any exception when attempting to set V6ONLY. (GH-17864)
Fixes error attempting to bind to IPv4 address.
diff --git a/Lib/http/server.py b/Lib/http/server.py
index b9a2717..c6e5ed6 100644
--- a/Lib/http/server.py
+++ b/Lib/http/server.py
@@ -103,6 +103,7 @@
import sys
import time
import urllib.parse
+import contextlib
from functools import partial
from http import HTTPStatus
@@ -1286,7 +1287,10 @@
# 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(