Hello!

On Mon, Feb 10, 2014 at 09:45:50AM -0800, Jeroen Ooms wrote:

> On Mon, Feb 10, 2014 at 5:15 AM, Maxim Dounin <mdounin@mdounin.ru> wrote:
> > it is likely the cause, as the config includes the following lines:
> >
> > proxy_cache_methods POST;
> > proxy_cache_key "$request_method$request_uri$request_body";
> >
>
> Yikes I was not aware that the cache key gets stored into the buffers
> as well. Is this mentioned in the manual anywhere?

Likely no. It's mostly proxy cache implementation detail - it needs a
way to write a cache header (which includes key) to a cache file,
and places it to the buffer just before response headers from
an upstream.

> So we need to set proxy_buffer_size to a value greater than the sum of
> client_body_buffer_size + header size?

If you use $request_body in the cache key - yes. And don't forget
to add other variables in proxy_cache_key.

> Or alternatively, is there a
> way that to use a fixed length hash of the request body in the
> proxy_cache_key?

As of now hashes may be calculated using, e.g., the embedded perl
or 3rd party modules.

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

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