HTTP Status Codes
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2XX - Success
201
Created
204
No Content
3XX - Redirection
300
Multiple Choices
301
Moved Permanently
5XX - Server Error
500
Internal Server Error
501
Not Implemented
502
Bad gateway
503
Service Unavailable
504
Gateway Timeout
505
HTTP Version Not Supported
509
Bandwidth Limit Exceeded
cPanel
520
Unknown error
Cloudflare
521
Web server is down
Cloudflare
522
Connection timed out
Cloudflare
523
Origin is Unreachable
Cloudflare
524
A Timeout Error
Cloudflare
525
SSL handshake failed
Cloudflare
526
Invalid SSL certificate
Cloudflare
527
Railgun Listener to Origin Error
Cloudflare
530
Origin DNS Error
Cloudflare