title: what is $0 and %0 in lighttpd configuration?
body: <p>so in this doc,
  <a href="https://redmine.lighttpd.net/projects/lighttpd/wiki/HowToRedirectHttpToHttps" rel="nofollow">https://redmine.lighttpd.net/projects/lighttpd/wiki/HowToRedirectHttpToHttps</a></p>
  
  <pre><code>$HTTP["scheme"] == "http" {
      # capture vhost name with regex conditiona -&gt; %0 in redirect pattern
      # must be the most inner block to the redirect rule
      $HTTP["host"] =~ ".*" {
          url.redirect = (".*" =&gt; "https://%0$0")
      }
  }
  </code></pre>
  
  <p><a href="http://1.2.3.4/dir/" rel="nofollow">http://1.2.3.4/dir/</a>
  what is %0 and what is $0 please ? </p>
  
  <p>Thanks !</p>