There's a bumper crop of new features this month. Share and enjoy!

Deprecations

Rack::AcceptFormat is slated for removal in rack-contrib 2.0.0 (due
on or after 1 January, 2016. Using this middleware will now result in a
deprecation warning being printed to stderr. If you use this
middleware, now would be a good time to start doing things properly.

Features

Rack::LazyConditionalGet: new middleware, by
Mig. This middleware tracks when the last
POST/PUT/DELETE request was made, and returns 304 responses to requests
which include a Last-Modified entity request header which is greater
than or equal to that time.
Rack::StaticCache: You can now specify a custom "version" regex for your
cache invalidation, if the default doesn't do it for you. Initial patch
provided by Eric Boehs.
Rack::Profiler: You can now run a single request through the profiler
multiple times, by adding the profiler_runs query parameter to the URL.
Patch provided by Bryce McDonnell.