title: Unexpected used port 80 on macOS with "It works" result
body: <p>I'm using macOS and I'm just wondering why port 80 is already used as I need to install my own nginx (as docker container) server. Going to <a href="http://localhost" rel="noreferrer">http://localhost</a> shows me "It works!". But I don't understand where this comes from, as I didn't installed anything by myself. I thought it could be an Apache server shipped with macOS.</p>
  
  <p>So I did</p>
  
  <pre><code>$ sudo lsof -i:80
  </code></pre>
  
  <p>And I got this result, which I do not understand:</p>
  
  <pre><code>COMMAND  PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
  httpd   9283 root    4u  IPv6 0x2e000a8d22b1a699      0t0  TCP *:http (LISTEN)
  httpd   9292 _www    4u  IPv6 0x2e000a8d22b1a699      0t0  TCP *:http (LISTEN)
  httpd   9307 _www    4u  IPv6 0x2e000a8d22b1a699      0t0  TCP *:http (LISTEN)
  </code></pre>