Zend\Diactoros\Uri::__toString PHP 메소드

    public function __toString()
    {
        if (null !== $this->uriString) {
            return $this->uriString;
        }
        $this->uriString = static::createUriString($this->scheme, $this->getAuthority(), $this->getPath(), $this->query, $this->fragment);
        return $this->uriString;
    }