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Cloudflare Errors
Cloudflare error codes start with 5xx (520-530 series) for origin issues, 1xxx for Workers, 1000-series for security blocks. Most common: 520 (web server returned unknown error), 522 (origin timeout), 524 (origin response timeout).
Cloudflare 5xx range distinguishes origin from edge: 520 = origin returned malformed response, 522 = origin TCP timeout, 524 = origin took >100s to respond, 525 = SSL handshake failed. Workers errors use 1101 (script threw), 1102 (CPU limit), 1015 (rate limited). Always check both Cloudflare dashboard and origin server logs.
Official docs
https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/
Status page
https://www.cloudflarestatus.com/
Support
https://support.cloudflare.com/