220 FTP Server ready.
502 'HELP': command not implemented.
500 'FEAT': command unrecognized.

HTTP/1.1 403 Forbidden
Content-Type: text/html; charset=iso-8859-1
Content-Length: 199
Connection: keep-alive
Keep-Alive: timeout=15
Date: Thu, 20 Mar 2025 17:06:18 GMT
Server: Apache

nginx

HTTP/1.1 400 Bad Request
Server: nginx
Date: Tue, 18 Mar 2025 02:28:38 GMT
Content-Type: text/html
Content-Length: 650
Connection: close