```ruby
require 'acfs/request/callbacks'

module Acfs

  class Request
    attr_accessor :body, :format
    attr_reader :url, :headers, :params, :data

    include Request::Callbacks

    def initialize(url, options = {})
      @url = URI.parse(url).tap do |url|
        @data    = options.delete(:data) || nil
        @format  = options.delete(:format) || :json
        @headers = options.delete(:headers) || {}
        @params  = options.delete(:params) || {}

        url.query = nil # params.any? ? params.to_param : nil
      end.to_s
    end

    def data?
      !data.nil?
    end

    class << self
      def new(*attrs)
        return attrs[0] if attrs[0].is_a? self
        super
      end
    end
  end
end
```

Add class comment for Acfs::Request.
user
```ruby
require 'acfs/request/callbacks'

module Acfs

  # Encapsulate all data required to make up a request to the
  # underlaying http library.
  #
  class Request
    attr_accessor :body, :format
    attr_reader :url, :headers, :params, :data

    include Request::Callbacks

    def initialize(url, options = {})
      @url = URI.parse(url).tap do |url|
        @data    = options.delete(:data) || nil
        @format  = options.delete(:format) || :json
        @headers = options.delete(:headers) || {}
        @params  = options.delete(:params) || {}

        url.query = nil # params.any? ? params.to_param : nil
      end.to_s
    end

    def data?
      !data.nil?
    end

    class << self
      def new(*attrs)
        return attrs[0] if attrs[0].is_a? self
        super
      end
    end
  end
end
```
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