Error 520 This error occurs when the origin server returns an empty, unknown, or unexpected response to Cloudflare

This error is often triggered by: – Origin server crashes or misconfigurations

– Firewalls or security plugins blocking Cloudflare IPs ↗ at your origin

– Headers exceeding 128 KB (often due to excessive cookies)

– Empty or malformed responses lacking an HTTP status code or response body

– Missing response headers or origin web server not returning proper HTTP error responses ↗

– Incorrect HTTP/2 configuration at the origin server

– Contact your hosting provider or site administrator and share the necessary error details to assist with troubleshooting

Request a review of your origin web server error logs for crashes and check for common causes mentioned in the previous section

– If HTTP/2 is enabled at your origin server, ensure it is correctly set up

Cloudflare connects to servers who announce support of HTTP/2 connections via ALPN ↗

If the origin web server accepts the HTTP/2 connection but then does not respect or support the protocol, an HTTP 520 error will be returned

You can disable the HTTP/2 to Origin in Speed > Optimization > Protocol Optimization on the Cloudflare dashboard

– If 520 errors continue after contacting your hosting provider or site administrator, provide the following information to Cloudflare Support:- Full URL(s) of the resource requested when the error occurred

– Cloudflare cf-ray from the 520 error message

– Output from http://<YOUR_DOMAIN>/cdn-cgi/trace

– Two HAR files: – One with Cloudflare enabled on your website

– Another with Cloudflare temporarily disabled

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🔗 Sumber: https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-520