Drupal cache static files#27

[drasgardian]

Allows a drupal installation to:

• Cache public static files, even for authenticated users.
• Cache page responses for anonymous users, but not authenticated.

https://github.com/wodby/varnish/issues/27

[drasgardian]

Prior to this change, using the drupal preset only static resources were being cached, and they were only being cached for anonymous users.

Now, public static resources will be cached by varnish for authenticated users too. Private files (e.g. /system/files/*) still won't get cached.

I also added the below to the drupal preset to get caching of page responses for anonymous users working.

sub vcl_backend_response {
    # Set the default TTL
    set beresp.ttl = {{ getenv "VARNISH_DEFAULT_TTL" "120s" }};
}

[pprishchepa]

Hi, @drasgardian, thank you for the PR.

Some questions and thoughts:

1. Could you squash 2 commits pls
2. Does this modification respect VARNISH_CACHE_STATIC_FILES setting?
3. It makes sense to make caching static for authenticated users optional and disabled by default. And looks like it must be another one option because VARNISH_CACHE_STATIC_FILES is about caching for anonymous.

[drasgardian]

Hi @PavelPrischepa

static.vcl.tmpl still checks for VARNISH_CACHE_STATIC_FILES and will return (pass); if not set.

I don't see why caching static files for authenticated users should be a separate configuration.

Requests (in a Drupal site) for static assets in the public filesystem, or in a theme or module are served directly by nginx anyway, without any PHP processing or authentication checks. So if caching of these static files is enabled for anonymous users, there shouldn't be any reason not to also cache for authenticated.

[drasgardian]

@PavelPrischepa 2 commits squashed into one as requested.