Pass arguments to create_server/connection.

src/websockets/sync/client.py

@@ -195,6 +195,8 @@ def connect(
             the connection. Set it to a wrapper or a subclass to customize
             connection handling.
 
+    Any other keyword arguments are passed to :func:`~socket.create_connection`.
+
     Raises:
         InvalidURI: If ``uri`` isn't a valid WebSocket URI.
         OSError: If the TCP connection fails.
@@ -245,10 +247,8 @@ def connect(
                 assert path is not None  # mypy cannot figure this out
                 sock.connect(path)
             else:
-                sock = socket.create_connection(
-                    (wsuri.host, wsuri.port),
-                    deadline.timeout(),
-                )
+                kwargs.setdefault("timeout", deadline.timeout())
+                sock = socket.create_connection((wsuri.host, wsuri.port), **kwargs)
             sock.settimeout(None)
 
         # Disable Nagle algorithm

src/websockets/sync/server.py

@@ -379,6 +379,9 @@ def handler(websocket):
         create_connection: Factory for the :class:`ServerConnection` managing
             the connection. Set it to a wrapper or a subclass to customize
             connection handling.
+
+    Any other keyword arguments are passed to :func:`~socket.create_server`.
+
     """
 
     # Process parameters
@@ -404,9 +407,10 @@ def handler(websocket):
         if unix:
             if path is None:
                 raise TypeError("missing path argument")
-            sock = socket.create_server(path, family=socket.AF_UNIX)
+            kwargs.setdefault("family", socket.AF_UNIX)
+            sock = socket.create_server(path, **kwargs)
         else:
-            sock = socket.create_server((host, port))
+            sock = socket.create_server((host, port), **kwargs)
     else:
         if path is not None:
             raise TypeError("path and sock arguments are incompatible")