code: function request (method, url) {
    // callback
        if ('function' === typeof url) {
          return new Request('GET', method).end(url)
        }
  
    // url first
        if (1 === arguments.length) {
          return new Request('GET', method)
        }
  
        return new Request(method, url)
      }
docs: 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