In message <[email protected]>, Adam
 McManus writes:

>> To me this looks like your backend does not answer inside the
>> "first_byte" timeout.
>
>That's what I initially thought, but the 503 is being generated within
>1-2 seconds max of initiating the request, not the 30 seconds being
>defined in each backend. Am I misunderstanding the first_byte timeout
>setting?

Probably not.

Are you 100% sure your backend is not closing the connection ?

Use tcpdump or similar to find out...

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
[email protected]         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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