gistfile1.coffee

correlator = ->
  Math.floor (Math.random() * 10000000000000000)

module.exports = new class DFP
  request: ({id, size, targets}, callback) =>
    counter = counter + 1
    data =
      # These field names and values have been determined by reverse engineering
      # requests made from Google's official GPT library. (The GPT library
      # cannot be used directly because it places all ad units in iframes.)
      gdfp_req:1
      correlator: correlator()
      output: "json_html"
      iu:id
      sz:size
      gut:"v2"
      ifi:counter
      json_a: 1
      url: window.location.href