Re: [core] Stateless proxy and 5.04 (Gateway Timeout)

[Christian Amsüss <[e-mail]>]

Hello Christer,

On Sun, Nov 03, 2019 at 08:32:55AM +0000, Christer Holmberg wrote:
> Q1: If the intermediary does *not* receive a response to the request
> sent towards the origin server, how can it send the 5.04 (Gateway
> Timeout) response?
>
> Q2: If the intermediary does not maintain request state, how can it
> even associate a request a timeout timer (that would trigger the 5.04
> response) with the request sent towards the origin server?

I would not expect a stateless proxy to generate 5.04 errors after a
timeout after sending a request.

What the stateless proxy does need to do is to keep some state about the
server it is talking to (in order to satisfy flow control requirements).
If that state indicates unavailability of the server, it could return
some 5.xx error (possibly even 5.04, don't know their precise
definitions off my head) immediately to a new incoming request for that
server.

Best regards
Christian

-- 
This may seem a bit weird, but that's okay, because it is weird.
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