220 FTP Server ready.
530 Login incorrect.
421 Service not available, closing control connection.
530 Not logged in.

HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 1271
Connection: keep-alive
Keep-Alive: timeout=15
Date: Thu, 12 Sep 2024 14:13:48 GMT
Server: Apache
X-Frame-Options: deny

nginx

HTTP/1.1 400 Bad Request
Server: nginx
Date: Thu, 05 Sep 2024 05:51:52 GMT
Content-Type: text/html
Content-Length: 650
Connection: close