code: function setHeadersFromObject (res, headers) {
    var keys = Object.keys(headers)
    for (var i = 0; i < keys.length; i++) {
      var k = keys[i]
      if (k) res.setHeader(k, headers[k])
    }
  }
docs: Set headers contained in object on the response object.
  
  @param {object} res
  @param {object} headers
  @private