:sig
String ws_scope()

:params
return value : scope identifier of the current WebSocket endpoint

:see
>websocket

:content
Returns the runtime's scope identifier for the current WebSocket endpoint.

This is the same default scope used by `ws_send()`, `ws_connections()`, and `ws_connection_count()` when no explicit scope is supplied.

In the current runtime implementation this scope is the page's internal endpoint identifier, typically the absolute `SCRIPT_FILENAME` of the `.uce` file that accepted the WebSocket upgrade.

:example
String scope = ws_scope();
print(scope == "" ? "(no WS scope in this context)" : scope, "\n");