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[Bug 61090] mod_proxy gives 502 on early HTTP response (3xx, 4xx, 5xx)


https://bz.apache.org/bugzilla/show_bug.cgi?id=61090

--- Comment #6 from felipe@xxxxxxxxxxxxxxxx ---
(In reply to Eric Covener from comment #5)
> (In reply to felipe from comment #4)
> > Whether the upstream application does a “staged” shutdown as 7230/6.6
> > envisions or does an abrupt close(), the change in mod_proxy would be the
> > same, wouldn’t it?
> 
> I don't think so, my assumption is that if the server had read the body,
> there would be no RST and the response would be read and returned as if it
> was a function of the body (as in a normal flow)

Having the server read the (entire) POST body is wasteful, though: the client
is “waiting for nothing”.

> 
> > 
> > Maybe mod_proxy wouldn’t necessarily have to poll() for a read event unless
> > ECONNRESET is received? I’m not sure of the performance implications of
> > poll()ing for 2 events regularly rather than just one, but I’d think that
> > would be the simplest way to handle the situation.
> 
> Seems like there is/was a risk in waiting for the write failure, the unread
> response might not still be given back to mod_proxy if the stack has seen
> the RST.

It’s definitely a less clean approach, true.

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