[varnish] Re: [varnish] Re: Handling of cache-control

[pablort]

Isn't this the equivalent of and max-age=5 and s-maxage=0 ?

On Wed, Jan 20, 2010 at 7:19 AM, Bedis 9 <bedis9 at gmail.com> wrote:

> Hi,
>
> Netcache devices had the X-Accel-Cache-Control headers in order to
> allow an origin server to setup different Cache-Control parameters for
> the cache and the end-user.
> The netcache will follow the X-Accel-Cache-Control while the end user
> will follow the Cache-Control.
>
> I've a few customer using this, mainly for sports events where "live"
> is the key.
> They setup X-Accel-Cache-Control to max-age=5 while Cache-Control is
> set to no-cache.
> That way, all the load generated by thousends of request per second
> for "live" stuff is offloaded to the cache layer.
> Only a few request goes back to the origin.
>
>
> I was able to reproduce such behavior with the following inline C:
> sub vcl_fetch {
> [...]
> # Check if X-Accel-Cache-Control exists and follow it
>        if (obj.http.X-Accel-Cache-Control) {
> C{
>        char *cache;
>        int max_age = 0;
>        cache = VRT_GetHdr(sp, HDR_OBJ, "\026X-Accel-Cache-Control:");
>        if(cache) {
>                char *s = NULL;
>                /* Looking for max-age */
>                if (s = strstr(cache, "max-age=")) {
>                        s+=8;
>                        max_age = strtoul(s, 0, 0);
>                        if (max_age) {
>                                VRT_l_obj_ttl(sp, max_age);
>                        }
>                }
>        }
> }C
>       unset obj.http.X-Accel-Cache-Control;
>        }
>
> # Cache-Control and Pragma headers preventing caching
>        if ((!obj.http.X-Accel-Cache-Control) && (obj.http.Pragma ~
> "no-cache" || obj.http.Cache-Control ~ "(no-cache|no-store|private)"))
> {
>                pass;
>        }
>
> }
>
> [...]
>
> }
>
>
> Maybe it can be useful to somebody else :)
>
> cheers
> _______________________________________________
> varnish-misc mailing list
> varnish-misc at projects.linpro.no
> http://projects.linpro.no/mailman/listinfo/varnish-misc
>
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