update CORS documentation (Fixes #327)

socketio/asyncio_server.py

@@ -51,9 +51,11 @@ class AsyncServer(server.Server):
                                   is greater than this value.
     :param cookie: Name of the HTTP cookie that contains the client session
                    id. If set to ``None``, a cookie is not sent to the client.
-    :param cors_allowed_origins: List of origins that are allowed to connect
+    :param cors_allowed_origins: Origin or list of origins that are allowed to
-                                 to this server. All origins are allowed by
+                                 connect to this server. Only the same origin
-                                 default.
+                                 is allowed by default. Set this argument to
+                                 ``'*'`` to allow all origins, or to ``[]`` to
+                                 disable CORS handling.
     :param cors_credentials: Whether credentials (cookies, authentication) are
                              allowed in requests to this server.
     :param engineio_logger: To enable Engine.IO logging set to ``True`` or pass

socketio/server.py

@@ -78,9 +78,11 @@ class Server(object):
     :param cookie: Name of the HTTP cookie that contains the client session
                    id. If set to ``None``, a cookie is not sent to the client.
                    The default is ``'io'``.
-    :param cors_allowed_origins: List of origins that are allowed to connect
+    :param cors_allowed_origins: Origin or list of origins that are allowed to
-                                 to this server. All origins are allowed by
+                                 connect to this server. Only the same origin
-                                 default.
+                                 is allowed by default. Set this argument to
+                                 ``'*'`` to allow all origins, or to ``[]`` to
+                                 disable CORS handling.
     :param cors_credentials: Whether credentials (cookies, authentication) are
                              allowed in requests to this server. The default is
                              ``True``.