Hello!

On Mon, Mar 24, 2014 at 06:20:03AM +0000, Riedel Sven wrote:

> Hi,
> I want to set up a small static HTML Page that informs visitors that our
> site is currently under load if an appserver cannot handle the request
> within N seconds.
>
> What would be the proper way to do this? Just set up a 504.html error
> page? And what are the different conditions when nginx will return a 503
> vs a 504?
> Are there subtle behavioral differences between a proxy_pass statement and
> an upstream pool definition?

There two errors which can be returned by proxy module in case of
upstream problems: 502 (if an error occurs) and 504 (if a request
times out). Usually it's good idea to handle both of them.

The 503 code is never used by proxy, it's only returned by
limit_conn / limit_req.

--
Maxim Dounin
http://nginx.org/

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