Description

Content negotiation for Rack applications, including a Rails-style respond_to block.

Features

• Allows both file-extension-based and Accept: header-based content negotiation

• Allows certain routes to pass through without negotiation (useful for static files, etc.)

• Falls back to a pre-set type if negotiation fails

• Injects a respond_to method with default handler into the application's namespace

• Injects negotiated_type, negotiated_ext, and negotiated? methods both into the application and into Rack::Request

Sinatra Example

require 'sinatra'
require 'rack/conneg'

use(Rack::Conneg) { |conneg|
  conneg.set :accept_all_extensions, false
  conneg.set :fallback, :html
  conneg.ignore('/stylesheets/')
  conneg.ignore_contents_of(File.join(File.dirname(__FILE__),'public'))
  conneg.provide([:json, :xml])
}

before do
  if negotiated?
    content_type negotiated_type
  end
end

get '/hello' do
  response = { :message => 'Hello, World!' }
  respond_to do |wants|
    wants.json  { response.to_json         }
    wants.xml   { response.to_xml          }
    wants.other { 
      content_type 'text/plain'
      error 406, "Not Acceptable" 
    }
  end
end

Release History

• 0.1.2 - Initial release

• 0.1.3 - Added proper RegExp escaping to match content types with + in them

• 0.1.4 - Added ignore_contents_of() to recursively ignore directory contents and negotiated? method to determine if negotiation took place

• 0.1.5 - Allow negotiation to fall back if no Accept: header supplied

• 0.1.6 - Add license