Varnish and language cookie

[Yann Malet]

>
> hello,
> This confusing behavior was due to a some of different factor a bug in
> django cache middleware for i18n pages, the same pages in french, german,
> english, .... and my relative inexperince with varnish. I think that now I
> have this issue solved witht the following configuration:
> http://dpaste.com/165182/
>
> The interesting parts are in vcl_recv :
> # This is the only important part of the cookie because
>
>     # an annonymous user could get a page that was generated and
>     # cached for another user.
>     if (req.http.Cookie ~ "django_language=") {
>         set req.http.X-Varnish-Language =
>             regsub(req.http.Cookie, "django_language=([a-z]{2})", "\1");
>
> }
>
> in vcl_hach where I add the language to the hash :
>
> sub vcl_hash {
>     set req.hash += req.url;
>     if (req.http.host) {
>         set req.hash += req.http.host;
>     } else {
>         set req.hash += server.ip;
>     }
>     set req.hash += req.http.X-Varnish-Language;
>     return (hash);
> }
>
> and in vcl_fetch where I have commented out the block that make varnish
> "pass" if there is a cookie :
>
> sub vcl_fetch {
>    if (obj.http.Pragma ~ "no-cache" || obj.http.Cache-Control ~ "(no-cache|no-store|private)") {
>    # varnish by default ignores Pragma and Cache-Control headers. It
>    # only looks at the "max-age=" value in the Cache-Control header to
>    # determine the TTL. So we need this rule so that the cache respects
>    # the wishes of the backend application.
>         pass;
>     }
>     if (!obj.cacheable) {
>         return (pass);
>     }
>     # don't allow caching pages that are protected by basic authentication
>     # unless when they explicitly set the cache-control to public.
>     if (req.http.Authorization && !obj.http.Cache-Control ~ "public") {
>         pass;
>     }
> # Varnish by default does not serve from cache if there is a cookie
> #    if (obj.http.Set-Cookie) {
> #        return (pass);
> #    }
>     set obj.prefetch =  -30s;
>     return (deliver);
> }
>
> thank you
> Regards,
> --yml
>
>
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