code: function request(RequestConstructor, method, url) {
    // callback
    if ('function' == typeof url) {
      return new RequestConstructor('GET', method).end(url);
    }
  
    // url first
    if (2 == arguments.length) {
      return new RequestConstructor('GET', method);
    }
  
    return new RequestConstructor(method, url);
  }
docs: The node and browser modules expose versions of this with the appropriate constructor function bound as first argument 
  Issue a request:
  
  Examples:
  
  request('GET', '/users').end(callback)
  request('/users').end(callback)
  request('/users', callback)
  
  @param {String} method
  @param {String|Function} url or callback
  @return {Request}
  @api public