code: function (params) {
          return Hawk.header(url.parse(params.url), params.method, params);
      }
docs: Computes signature and Auth header for a request.
  
  @param {Object} params
  @param {Object} params.credentials Contains hawk auth credentials, "id", "key" and "algorithm"
  @param {String} params.nonce
  @param {String} params.ext Extra data that may be associated with the request.
  @param {String} params.app Application ID used in Oz authorization protocol
  @param {String} params.dlg Delegation information (used in the Oz protocol)
  @param {String} params.user User id
  @param {String} params.url Complete request URL
  @param {String} params.method Request method
  
  @returns {*}