en is not None:
            req.context.client.token = req.context.function_bot_access_token

        return await next()</code></pre>
</details>
<div class="desc"><p>A middleware can process request data before other middleware and listener functions.</p></div>
<h3>Ancestors</h3>
<ul class="hlist">
<li><a title="slack_bolt.middleware.async_middleware.AsyncMiddleware" href="async_middleware.html#slack_bolt.middleware.async_middleware.AsyncMiddleware">AsyncMiddleware</a></li>
</ul>
<h3>Inherited members</h3>