elf._is_ssl_check_request(req.body):
            if self._verify_token_if_needed(req.body):
                return self._build_error_response()
            return self._build_success_response()
        else:
            return await next()</code></pre>
</details>
<div class="desc"><p>A middleware can process request data before other middleware and listener functions.</p>
<p>Handles <code>ssl_check</code> requests.
Refer to <a href="https://api.slack.com/interactivity/slash-commands">https://api.slack.com/i