cloudflare error 520 web server is returning an unknown error

[stevesmith]

my site goes down randomly with error 520. checking my host logs and the server isn't even crashing. what causes this?

 

[insacretnet]

hey, i've hit this before. it's usually cloudflare related since it's a 520. even if your server isn't crashing, it could be an issue with how your server is talking to cloudflare. i'd check things like: * really large response headers * origin server closing the connection unexpectedly * or sometimes just an empty/invalid response. cloudflare's docs actually have a pretty good list of what can cause it. good luck!

 

[Alemia]

hey, i've hit this before. it's usually cloudflare related since it's a 520. even if your server isn't crashing, it could be an issue with how your server is talking to cloudflare. i'd check things like: * really large response headers * origin server closing the connection unexpectedly * or sometimes just an empty/invalid response. cloudflare's docs actually have a pretty good list of what can cause it. good luck!

oh thanks for the suggestions that makes sense