mod_aclr2

[Andrey Belov]

Martin,

On Jan 11, 2012, at 7:31 PM, Martin Loy wrote:

> Would you explain the main difference between using your module and using nginx as a reverse proxy and caching static content ?

In some situations, mod_aclr2 helps to avoid excessive disk I/O,
especially for big static responses.

When nginx is used as a local reverse proxy and proxy_buffering is
enabled, every upstream reponse which can not fit into proxy buffers
may be temporarily saved on disk:

http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffering
http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_temp_path

For example, we have to process the request for 700mb video file,
without mod_aclr2:

1) nginx sends the request to apache
2) apache sends 700mb file back to nginx
3) nginx saves received file on disk (proxy_temp_path) and
starts sending it back to the client

and with mod_aclr2:

1) nginx sends the request to apache
2) apache sends a few bytes header with X-Accel-Redirect back to nginx
3) nginx starts sending the file directly from disk

You save your time and your disk at step #2.

Of course, you also may use proxy_cache along with mod_aclr2,
but if your disks are fast enough, probably you won't need
to do any caching at all.

Hope this helps.


> 
> Regards
> 
> M
> 
> On Wed, Jan 11, 2012 at 11:54 AM, António P. P. Almeida <appa at perusio.net> wrote:
> On 11 Jan 2012 13h17 WET, defan at nginx.com wrote:
> 
> > Hello!
> >
> > Ever wondered how to set up NGINX as a local proxy for Apache 2.x
> > with minimum efforts?
> 
> Nice work Andrey. Opens up Nginx as a possibility for shared hosting
> (keep using .htaccess) and voids any resistance people might have trying
> Nginx out. It's sooo easy now :)
> 
> Thanks,
> --- appa
> 
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