title: HTTP authenticate all varnish requests
body: <p>we're attempting to use Varnish to cache the results from a third party service, which we hit regularly. Unfortunately, when their service goes down our site pretty much becomes non- functional.</p>
  
  <p>The issue I’m running into is that the service we connect to requires http authentication access any of the URLs we hit. I’d like to be able to set the username and password in my default.vcl file by default so that it will automatically include the authentication in every request.</p>