[Web] Fix serve.py utility on Windows

IPv6 dual stack is disabled by default, and Windows resolves wildcard
addresses to an IPv6 by default, so connecting through the local IPv4
address would not work.

This enables IPv6 dual stacking for the HTTP server by default like done
in upstream python when launching the module from CLI.

platform/web/serve.py

@@ -5,9 +5,20 @@ from pathlib import Path
 import os
 import sys
 import argparse
+import contextlib
+import socket
 import subprocess
 
 
+# See cpython GH-17851 and GH-17864.
+class DualStackServer(HTTPServer):
+    def server_bind(self):
+        # Suppress exception when protocol is IPv4.
+        with contextlib.suppress(Exception):
+            self.socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0)
+        return super().server_bind()
+
+
 class CORSRequestHandler(SimpleHTTPRequestHandler):
     def end_headers(self):
         self.send_header("Cross-Origin-Opener-Policy", "same-origin")
@@ -32,7 +43,7 @@ def serve(root, port, run_browser):
         print("Opening the served URL in the default browser (use `--no-browser` or `-n` to disable this).")
         shell_open(f"http://127.0.0.1:{port}")
 
-    test(CORSRequestHandler, HTTPServer, port=port)
+    test(CORSRequestHandler, DualStackServer, port=port)
 
 
 if __name__ == "__main__":