We’re seeing 520 responses coming back from cloudflare for a particular URL, about once every few days. We have automatic retry logic that re-requests the resource after 3 seconds. So far that retry has always been successful (i.e. returns the HTML with status 200).
Is there any way to see in cloudflare what caused the 520 (i.e. what was the response that caused this error)?
According to our server logs the failing request never reaches our server, so I don’t have any way of knowing why cloudflare responds this way.