    public function isLocal($config, $context) {
        if ($this->host === null) return true;
        $uri_def = $config->getDefinition('URI');
        if ($uri_def->host === $this->host) return true;
        return false;
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.