014.rb

    # $ curl -i -H 'Accept: application/vnd.helloapp-v2+json' http://localhost:8080/hello/prug
    # 
    # HTTP/1.1 200 OK 
    # Content-Type: application/vnd.helloapp-v2+json
    # Vary: Accept
    # Content-Length: 11
    # Server: Webmachine-Ruby/0.3.0 WEBrick/1.3.1 (Ruby/1.9.2/2011-07-09)
    # Date: Thu, 26 Jan 2012 15:27:09 GMT
    # Connection: Keep-Alive
    # 
    # Nay! Hello
    
    class HelloResource < Webmachine::Resource
      def content_types_provided
        [['application/vnd.helloapp-v1+json', :to_representation_yay],
         ['application/vnd.helloapp-v2+json', :to_representation_nay]]
      end
    
      def to_representation_yay
        "Yay! Hello #{request.path_info[:id]}"
      end
    
      def to_representation_nay
        "Nay! Hello #{request.path_info[:id]}"
      end
    end