What is an http request multiplexer? : <p>I've been studying golang and I noticed a lot of people create servers by using the <code>http.NewServeMux()</code> function and I don't really understand what it does.</p>

<p>I read this:</p>

<blockquote>
  <p>In go ServeMux is an HTTP request multiplexer. It matches the URL of
  each incoming request against a list of registered patterns and calls
  the handler for the pattern that most closely matches the URL.</p>
</blockquote>

<p>How is that different than just doing something like:</p>

<pre><code>http.ListenAndServe(addr, nil)
http.Handle("/home", home)
http.Handle("/login", login)
</code></pre>

<p>What is the purpose of using multiplexing?</p>
