gh-80184: Set getattr(socket, "SOMAXCONN", 5) as the default queue size for TCPServer

Doc/library/socketserver.rst

@@ -24,6 +24,8 @@ There are four basic concrete server classes:
    :meth:`~BaseServer.server_activate`.  The other parameters are passed to
    the :class:`BaseServer` base class.
 
+   .. versionchanged:: next
+      The default queue size is now ``socket.SOMAXCONN`` for :class:`socketserver.TCPServer`.
 
 .. class:: UDPServer(server_address, RequestHandlerClass, bind_and_activate=True)
 

Lib/socketserver.py

@@ -441,7 +441,7 @@ class TCPServer(BaseServer):
 
     socket_type = socket.SOCK_STREAM
 
-    request_queue_size = 5
+    request_queue_size = getattr(socket, "SOMAXCONN", 5)
 
     allow_reuse_address = False
 

Misc/NEWS.d/next/Library/2025-05-19-17-27-21.gh-issue-80184.LOkbaw.rst

@@ -0,0 +1 @@
+The default queue size is now ``socket.SOMAXCONN`` for :class:`socketserver.TCPServer`.