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
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.
gem install rack-abstract-format
require 'rack' require 'rack/abstract_format' use Rack::AbstractFormat run app
GET /path/resource.xml Accept: text/html
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
The abstracted media type can then be easily retrieved with the
Rack::AcceptMediaTypes convenience middleware, which parses
request.accept_media_types #=> ['application/xml', 'text/html'] request.accept_media_types.prefered #=> 'application/xml'