text: 
  module.exports = function (lines) {
    var headers = {};
    for (var i=1, l=lines.length; i<l; i++) {
      var index = lines[i].indexOf(": ");
      if (index !== -1) {
        headers[lines[i].substring(0, index).toLowerCase()] = lines[i].substring(index+2);
      }
    }
    return headers;
  };
  