Summary
Strips the extension from the requested path (env['PATH_INFO']), casts it to
media type, and prepends it to env['HTTP_ACCEPT']. This allows dealing with path
information separately from format information, which are often different
concerns.
This is especially useful when dealing with routes as it allows a resource to always point to the same action independently of the requested format.
Usage
require 'rack'
require 'rack/abstract_format'
use Rack::AbstractFormat
run app
The request:
GET /path/resource.xml
Accept: text/html
will become:
GET /path/resource
env['HTTP_ACCEPT'] #=> 'application/xml,text/html'
AbstractFormat also accepts an optional argument, used to set the default format that should be assumed when none is specified on the URL:
use Rack::AbstractFormat, 'text/html'
#=> GET /path/resource # requested
#=> GET /path/resource.html # assumed