You can clone with
HTTPS or Subversion.
It should be possible to purge and/or invalidate cache entries explicitly using an API or response header.
There is the project http://github.com/svenfuchs/rack-cache-purge.
Maybe one could integrate something similar.
Which cache purging methods are supported by other caches?
Yep. That's the plan. There's a thread discussing this on the mailing list:
I just haven't got around to merging it in yet. It should happen soon.
This is obviously super old... so sorry for opening it up. Are there any plans to incorporate this?
+1 from me, would be cool to have it