Fatal error: Uncaught Swoole\Exception: Swoole\WebSocket\Server can only be used in CLI mode in /project/demo/swoole/websocket/ws.php:6 Stack trace: #0 /project/demo/swoole/websocket/ws.php(6): Swoole\Server->__construct('0.0.0.0', 9502) #1 {main} thrown in /project/demo/swoole/websocket/ws.php on line 6