Cloudflare 520 Errors Explained and Investigated

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What is a Cloudflare 520 Error?

The Cloudflare 520 error code is similar to an HTTP server error code. The Cloudflare worker returns these errors when they’re unable to complete their task. There is no HTTP server error code 520, it’s a specific Cloudflare error code, here’s the definition.

520 Web Server Returned an Unknown Error

The origin server returned an empty , unknown, or unexplained response to Cloudflare

You can read more about Cloudflare’s 520 Error on their support site.

How can I troubleshoot a Cloudflare 520 Error?


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