Authcache now allows you to cache for anonymous users.
How does this differ from using Boost for anonymous users?
So far as I can see, there isn't a difference in principle. (though there might be minor advantages either way in the implementation)
And so far as I know, Authcache has always cached for anonymous users
Authcache for anonymous users works exactly like the built-in caching mechanism of drupal core. When configured properly it is possible to avoid connecting to the database and serve pages directly from e.g. memcache. However some PHP code is still executed for each request. In contrast using boost it is possible to avoid executing PHP altogether when serving cached pages.
FYI, using authcache together with boost could be an option in the future: #1932444: Boost as Authcache Backend
I have varnish enabled on a multisite setup.
So I would like to not have to enabled another module and have to edit /etc/varnish/default.vcl file to accomodate boost special http rules
Don't get me wrong, boost will never be a requirement for authcache. But it could be interesting as an option - especially on shared hosts.
Authcache now has experimental support for boost as the cache backend (see authcache_boost in the modules directory of the 7.x-2.x branch).
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