How to use

propertyNames

function

in

Array

RequestLine.propertyNames.forEach(function (propertyName) {
    if (typeof obj[propertyName] !== 'undefined') {
      this[propertyName] = obj[propertyName];
    }
  }, this);

StatusLine.propertyNames.forEach(function (propertyName) {
    if (typeof obj[propertyName] !== 'undefined') {
      this[propertyName] = obj[propertyName];
    }
  }, this);