title: Fat-Free Framework redirects to invalid url
body: <p>I'm currently using Fat-Free Framework for a project. But whenever I browse to <strong><a href="http://localhost/fatfree/admin/login/" rel="nofollow noreferrer">http://localhost/fatfree/admin/login/</a></strong>, F3 will redirect to the url without slash ("/") at the end. I know this is normal, but the url that I'm being redirected to is invalid. F3 redirects me to <strong><a href="http://localhosthttp//localhost/fatfree//admin/index" rel="nofollow noreferrer">http://localhosthttp//localhost/fatfree//admin/index</a></strong> (exact url)</p>
  
  <p>I'm running PHP 7.1.0 + Apache 2.4 on Windows 7 64 bit</p>
  
  <p><strong>Config/config.ini.php:</strong></p>
  
  <pre><code>[globals]
  DEBUG=3
  UI=Views/
  BASE=http://localhost/fatfree/
  SITENAME="my website"
  
  [configs]
  Config/database.ini.php=false
  Config/routes.ini.php=false
  </code></pre>
  
  <p><strong>Config/routes.ini.php:</strong></p>
  
  <pre><code>;&lt;?php die; ?&gt;
  
  [routes]
  
  ; main section
  GET /=Controllers\Main-&gt;index
  GET /products=Controllers\Products
  
  ; customer section
  
  ; admin section
  GET /admin=Controllers\Admin-&gt;index
  GET /admin/index=Controllers\Admin-&gt;index
  GET /admin/login=Controllers\Admin-&gt;login
  </code></pre>
  
  <p>How do I make sure that F3 redirects to the correct url?</p>
  
  <p>Do I have to set a Framework Variable? </p>