/**
  * @return array
  */
 public function getHttpHeaders()
 {
     $headers = parent::getHttpHeaders();
     if (count($this->allowedMethods) !== 0) {
         $headers[] = 'Allow: ' . implode(', ', $this->allowedMethods);
     }
     return $headers;
 }
 /**
  * @return array
  */
 public function getHttpHeaders()
 {
     $headers = parent::getHttpHeaders();
     $headers[] = 'Proxy-Authenticate: ' . $this->authenticationInfo;
     return $headers;
 }