If you save this file and hover over the link, firefox will decode %2F%2F to // and hence the link is broken.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<a href="linux%2F%2Funix_servers.html">linux%2F%2Funix_servers.html</a>
Are there ways to prevent the browser from decoding the special characters in links?
If the URL is to contain the real percent sign “%”, then by the applicable encoding rules, it must be %-encoded, as “%25”. Thus the URL should be written as linux%252F%252Funix_servers.html