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## 0.5
- Document allow_revalidate and allow_reload options.
- Support multiple memcache servers.
- Purge/invalidate everything
- Explicit expiration/invalidation based on response headers or via an
object interface passed in the rack env.
- Sample apps: Rack, Rails, Sinatra, Merb, etc.
- Move old breakers.rb configuration file into rack-contrib as a
middleware component.
## Backlog
- Use Bacon instead of test/spec
- Fast path pass processing. We do a lot more than necessary just to determine
that the response should be passed through untouched.
- Invalidate at the URI of the Location or Content-Location response header
on POST, PUT, or DELETE that results in a redirect.
- Maximum size of cached entity
- Last-Modified factor: requests that have a Last-Modified header but no Expires
header have a TTL assigned based on the last modified age of the response:
TTL = (Age * Factor), or, 1h = (10h * 0.1)
- Consider implementing ESI (http://www.w3.org/TR/esi-lang). This should
probably be implemented as a separate middleware component.
- stale-while-revalidate
- Serve cached copies when down (see: stale-if-error) - e.g., database
connection drops and the cache takes over what it can.
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