curl http://status.slack.com
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>302 Found</title>
</head><body>
<h1>Found</h1>
<p>The document has moved <a href="https://status.slack.com">here</a>.</p>
<hr>
<address>Apache/2.4.7 (Ubuntu) Server at status.slack.com Port 80</address>
</body></html>
The HTML parts are fallback for if your browser (or curl) in this case doesn't handle a 302