    protected function setupMemberVariables($config) {
        $this->host = $config->get('URI.Host');
        $base_uri = $config->get('URI.Base');
        if (!is_null($base_uri)) {
            $parser = new HTMLPurifier_URIParser();
            $this->base = $parser->parse($base_uri);
            $this->defaultScheme = $this->base->scheme;
            if (is_null($this->host)) $this->host = $this->base->host;
        }
        if (is_null($this->defaultScheme)) $this->defaultScheme = $config->get('URI.DefaultScheme');
    }
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.