title: Varnish 4 Basic authentication
body: <p>I have to cache multiple backend servers, I switch from Nginx to Varnish and finally discover 2 server need to run HTTP Basic Authentication. 
  I try this link <a href="http://blog.tenya.me/blog/2011/12/14/varnish-http-authentication" rel="noreferrer">http://blog.tenya.me/blog/2011/12/14/varnish-http-authentication</a> and it not work for me (they ran Varnish 3)
  Is there an easy way to configure Basic Authentication in Varnish 4?</p>