code: function _gpfHttpGenSetHeaders (methodName) {
      return function (httpObj, headers) {
          if (headers) {
              Object.keys(headers).forEach(function (headerName) {
                  httpObj[methodName](headerName, headers[headerName]);
              });
          }
      };
  }
docs: Generates a function that transmit headers to the http object
  
  @param {String} methodName Name of the method to call
  @return {Function} Method to set the headers
  @gpf:closure
  @since 0.2.1