== Future specification changes
PLEASE NOTE: In versions of Rack LATER than 0.4, the following
changes will be commited to the Rack specification:
* 1xx, 204 and 304 status codes MUST not contain a Content-Type.
* A valid Content-Length header MUST be provided for non 1xx, 204 and 304
responses with a Transfer-Encoding of "identity" (default).
The Content-Length MUST be the same as the sum of the byte-sizes of
the chunks.
* The REQUEST_METHOD may be any HTTP token.
Internal Rack modules have been updated to follow this behavior, but
the Rack 0.4 Lint does NOT check it yet for compatibility reasons.
Please update your libraries accordingly.
== Changes
* August 21st, 2008: Fourth public release 0.4.
* New middleware, Rack::Deflater, by Christoffer Sawicki.
* OpenID authentication now needs ruby-openid 2.
* New Memcache sessions, by blink.
* Explicit EventedMongrel handler, by Joshua Peek.
* Rack::Reloader is not loaded in rackup development mode.
* rackup can daemonize with -D.
* Many bugfixes, especially for pool sessions, URLMap, thread safety
and tempfile handling.
* Improved tests.
* Rack moved to Git.
Rack provides a minimal, modular and adaptable interface for developing
web applications in Ruby. By wrapping HTTP requests and responses in
the simplest way possible, it unifies and distills the API for web
servers, web frameworks, and software in between (the so-called
middleware) into a single method call.
