===== Summary
Rack middleware to specify an app's supported media types.
Returns '406 Not Acceptable' status when unsuported type is requested.
===== Install
  gem install rack-supported-media-types
===== Example
  require 'rack'
  require 'rack/supported_media_types'
  use Rack::SupportedMediaTypes, %w( application/xml application/json )
  run App.new
  # will give you:
  GET /foo
  Accept: text/html,text/plain
  #=> 406 Not Acceptable
  GET /foo
  Accept: application/xml,text/html
  #=> 200 OK
  GET /foo
  Accept: application/json,text/html
  #=> 200 OK
see examples/simple.ru for example code.
===== Tip
To read the requested type from the url's extension instead of the Accept
header (which is a more realistic use case), use Rack::AbstractFormat before
Rack::SupportedMediaTypes.
  # gem install rack-abstract-format
  require 'rack'
  require 'rack/abstract_format'
  require 'rack/supported_media_types'
  use Rack::AbstractFormat
  use Rack::SupportedMediaTypes, %w( application/xml application/json )
  run App.new
  # will result in:
  GET /foo.html
  #=> 406 Not Acceptable
  GET /foo.xml
  #=> 200 OK
  GET /foo.json
  #=> 200 OK
see examples/recommended.ru for example code.
===== Links
code:: https://github.com/mynyml/rack-supported-media-types
docs:: https://docs.github.com/mynyml/rack-supported-media-types