5XX - Server Error

  1. 500 Internal Server Error
  2. 501 Not Implemented
  3. 502 Bad gateway
  4. 503 Service Unavailable
  5. 504 Gateway Timeout
  6. 505 HTTP Version Not Supported
  7. 509 Bandwidth Limit Exceeded cPanel
  8. 520 Unknown error Cloudflare
  9. 521 Web server is down Cloudflare
  10. 522 Connection timed out Cloudflare
  11. 523 Origin is Unreachable Cloudflare
  12. 524 A Timeout Error Cloudflare
  13. 525 SSL handshake failed Cloudflare
  14. 526 Invalid SSL certificate Cloudflare
  15. 527 Railgun Listener to Origin Error Cloudflare
  16. 530 Origin DNS Error Cloudflare

2XX - Success

  1. 201 Created
  2. 204 No Content

3XX - Redirection

  1. 300 Multiple Choices
  2. 301 Moved Permanently