mock/index.html
<html>
<body>
<a href="whiskey/">whiskey</a>
<a href="ten/">ten</a>
<a href="/roger/">roger</a>
<a href="about/">about</a>
<a href="about/#fragment">fragment</a>
<a href="https://example.com">external</a>
<a href="mailto:who@ha.com">mailto</a>
<a href="https://invalid-host">invalid</a>
<a href="https://httpbin.org/basic-auth/user/pass">401</a>
</body>
</html>