Upstream error checks

hroostik · 2017-02-16T07:15:09+00:00

Hello to anyone! My name is Andriy. I'm newbie in Openresty, but its really cool idea and I glad, that we have such powerful thing (thanks to the maintai...

Upstream error checks

hroostik

Hello everyone,

I'm trying to catch various types of errors on upstream and to show users the real cause of the problem (more detailed then showing only 503/504). I found interesting implementation of it at CloudFlare (https://support.cloudflare.com/hc/en-us/sections/200820298-Error-Pages):

Error 522: Connection timed out

Error 521: Web server is down

Error 520: Web server is returning an unknown error

Error 523: Origin is unreachable

Error 524: A timeout occurred

Error 525: SSL handshake failed

Error 526: Invalid SSL certificate

But I have no idea how to catch same errors and separate details via Openresty & Lua. Could anyone share some PoC or examples with me, please?

I would be grateful for any help on this matter.

Thanks,

Alex