[Python-checkins] bpo-38907: In http.server script, restore binding to IPv4 on Windows. (GH-17851)

[Jason R. Coombs]

https://github.com/python/cpython/commit/ee94bdb0598f9bc47d6a49e58fffc97aa617be96
commit: ee94bdb0598f9bc47d6a49e58fffc97aa617be96
branch: master
author: Jason R. Coombs <jaraco at jaraco.com>
committer: GitHub <noreply at github.com>
date: 2020-01-05T22:32:19-05:00
summary:

bpo-38907: In http.server script, restore binding to IPv4 on Windows. (GH-17851)

files:
A Misc/NEWS.d/next/Library/2020-01-06-02-14-38.bpo-38907.F1RkCR.rst
M Lib/http/server.py

diff --git a/Lib/http/server.py b/Lib/http/server.py
index 47a4fcf9a6518..b9a2717681f53 100644
--- a/Lib/http/server.py
+++ b/Lib/http/server.py
@@ -1282,4 +1282,16 @@ def test(HandlerClass=BaseHTTPRequestHandler,
     else:
         handler_class = partial(SimpleHTTPRequestHandler,
                                 directory=args.directory)
-    test(HandlerClass=handler_class, port=args.port, bind=args.bind)
+
+    # 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)
+            return super().server_bind()
+
+    test(
+        HandlerClass=handler_class,
+        ServerClass=DualStackServer,
+        port=args.port,
+        bind=args.bind,
+    )
diff --git a/Misc/NEWS.d/next/Library/2020-01-06-02-14-38.bpo-38907.F1RkCR.rst b/Misc/NEWS.d/next/Library/2020-01-06-02-14-38.bpo-38907.F1RkCR.rst
new file mode 100644
index 0000000000000..a6e79f7809521
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-01-06-02-14-38.bpo-38907.F1RkCR.rst
@@ -0,0 +1 @@
+In http.server script, restore binding to IPv4 on Windows.
\ No newline at end of file