title: How to get the Base Url in Twig
body: <p>I am using twig in Node+express. How can I get the base url in twig file ? 
  I've tried the following 2 snippets:</p>
  
  <pre><code>{{ app.request.schemeAndHttpHost ~ app.request.requestUri }}
  </code></pre>
  
  <p><br></p>
  
  <pre><code>{{path()}}
  </code></pre>