https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudfla

Troubleshooting Cloudflare 5XX errors · Cloudflare Support docs
When troubleshooting most 5XX errors, the correct course of action is to first contact your hosting provider or site administrator to troubleshoot and …
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https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/#error-520-web-server-returns-an-unknown-error - Cloudflare Developers