code: public function setSandbox(string $sandbox):void
      {
          if (!in_array($sandbox, self::SANDBOX_VALUES)) {
              throw new MiddlewareException(
                  $this,
                  sprintf(
                      "%s is not a correct value for the CSP sandbox, correct values are: %s (see %s)",
                      $sandbox, implode(', ', self::SANDBOX_VALUES),
                      'https://developer.mozilla.org/docs/Web/HTTP/Headers/Content-Security-Policy/sandbox'
                  )
              );
          }
          $this->tags['sandbox'] = $sandbox;
      }
docs: Sets the 'sandbox' value of the CSP. See the SANDBOX_XYZ class constants for the possible values.
  
  @link https://developer.mozilla.org/docs/Web/HTTP/Headers/Content-Security-Policy/sandbox
  @param string $sandbox
  @throws MiddlewareException