Hi Dmitry,
On Thu, Nov 22, 2012 at 08:03:26PM +0400, Dmitry Sivachenko wrote:
> Hello!
>
> I was reading docs about HTTP compression support in -dev13 and it is a bit
> unclear to me how it works.
>
> Imagine I have:
> compression algo gzip
> compression type text/html text/javascript text/xml text/plain
>
> in defaults section.
>
> What will haproxy do if:
> 1) backend server does NOT support compression;
Haproxy will compress the matching responses.
> 2) backend server does support compression;
You have two possibilities :
- either you just have the lines above, and the server will see
the Accept-Encoding header from the client and will compress
the response ; in this case, haproxy will see the compressed
response and will not compress again ;
- or you also have a "compression offload" line. In this case,
haproxy will remove the "Accept-Encoding" header before passing
the request to the server. The server will then *not* compress,
and haproxy will compress the response. This is what I'm doing
at home because the compressing server is bogus and sometimes
emits wrong chunked encoded data!
> 3) backend server does support compression and there is no these two
> compression* lines in haproxy config.
Then haproxy's normal behaviour remains unchanged, the server compresses
if it wants to and haproxy transfers the response unmodified.
> I think documentation needs to clarify things a bit.
Possibly, however I don't know what to clarify nor how, it's always
difficult to guess how people will understand a doc :-(
Could you please propose some changes ? I would be happy to improve
the doc if it helps people understand it.
Thanks!
Willy
