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Error 520 is a server-side error caused by a connection issue between the web server and the origin server. Try refreshing the page, clearing your browser cache and cookies, contacting your hosting provider or website administrator, and checking your server's logs for any issues to prevent this error.

When your site's visitors see error 520 in their browser, it means Cloudflare is sending the message because your server returned an empty, unknown, or unexpected response.