HTTP Version Not Supported
5xx

505 HTTP Version Not Supported
Variant Also Negotiates
5xx

506 Variant Also Negotiates
Insufficient Storage
5xx

507 Insufficient Storage
Loop Detected
5xx

508 Loop Detected
Bandwidth Limit Exceeded
5xx

509 Bandwidth Limit Exceeded
Not Extended
5xx

510 Not Extended
Network Authentication Required
5xx

511 Network Authentication Required
Web Server Is Down
5xx

521 Web Server Is Down
Connection Timed Out
5xx

522 Connection Timed Out
Origin Is Unreachable
5xx

523 Origin Is Unreachable
SSL Handshake Failed
5xx

525 SSL Handshake Failed
Site Frozen
5xx

530 Site Frozen