title: Valet does not run on port - Mac/Sierra OSX
body: <p>I installed Laravel via composer and I can run my site via Mamp and other Mac's server environments.
  I installed Valet and its plugins correctly and I received a message when I type <code>valet</code> in Terminal that shows it installed correctly. But it doesn't work and I received <code>ERR_EMPTY_RESPONSE</code> in browser.
  At the end when I scan 80 port (default port) via <code>netstat -an | grep "\.80" | grep LISTEN</code> there isn't any service running on 80.</p>