$ curl http://localhost:631

$ curl http://localhost:631
<!DOCTYPE HTML>
<html>
  <head>
    <link rel="stylesheet" href="/cups.css" type="text/css">
    <link rel="shortcut icon" href="/apple-touch-icon.png" type="image/png">
    <meta charset="utf-8">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=9">
    <meta name="viewport" content="width=device-width">
    <title>Home - CUPS 2.2.6</title>
  </head>
  <body>
    <div class="header">
      <ul>
	<li><a href="http://www.cups.org/" target="_blank">CUPS.org</a></li>
	<li><a class="active" href="/">Home</a></li>
	<li><a href="/admin">Administration</a></li>
	<li><a href="/classes/">Classes</a></li>
	<li><a href="/help/">Help</a></li>
	<li><a href="/jobs/">Jobs</a></li>
	<li><a href="/printers/">Printers</a></li>
      </ul>
    </div>
    <div class="body">
      <div class="row">
	<h1>CUPS 2.2.6</h1>
	<p>CUPS is the standards-based, open source printing system developed by <a href="http://www.apple.com/">Apple Inc.</a> for macOS<sup>&reg;</sup> and other UNIX<sup>&reg;</sup>-like operating systems.</p>
      </div>
      <div class="row">
	<div class="thirds">
	  <h2>CUPS for Users</h2>
	  <p><a href="help/overview.html">Overview of CUPS</a></p>
	  <p><a href="help/options.html">Command-Line Printing and Options</a></p>
	  <p><a href="http://www.cups.org/lists.php?LIST=cups">User Forum</a></p>
	</div>
	<div class="thirds">
	  <h2>CUPS for Administrators</h2>
	  <p><a href="admin">Adding Printers and Classes</a></p>
	  <p><a href="help/policies.html">Managing Operation Policies</a></p>
	  <p><a href="help/network.html">Using Network Printers</a></p>
	  <p><a href="help/man-cupsd.conf.html">cupsd.conf Reference</a></p>
	</div>
	<div class="thirds">
	  <h2>CUPS for Developers</h2>
	  <p><a href="help/api-overview.html">Introduction to CUPS Programming</a></p>
	  <p><a href="help/api-cups.html">CUPS API</a></p>
	  <p><a href="help/api-filter.html">Filter and Backend Programming</a></p>
	  <p><a href="help/api-httpipp.html">HTTP and IPP APIs</a></p>
	  <p><a href="http://www.cups.org/lists.php?LIST=cups-devel">Developer Forum</a></p>
	</div>
      </div>
    </div>
    <div class="footer">CUPS and the CUPS logo are trademarks of <a href="http://www.apple.com">Apple Inc.</a> Copyright &copy; 2007-2017 Apple Inc. All rights reserved.</div>
  </body>
</html>