liip/LiipCacheControlBundle — pull request #14 by digitalkaoz (2012-07-19 10:33:05+00:00)
Title: added more caching proxy headers

added additional headers (some special for varnish):

`must_revalidate`
`proxy_revalidate`
`no_transform`
`stale_if_error`
`stale_while_revalidate`

so you are able to do something like that:

``` yaml
# app/config.yml
liip_cache_control:
rules:
# the controls section values are used in a call to Response::setCache();
- { path: /, controls: { stale_while_revalidate=9000, stale_if_error=3000, must-revalidate=false, proxy_revalidate=true } }
```