title: Reverse URL in template
body: <p>In a template, how can I map a name back into a URL, similar to Django's <code>{% url %}</code> tag?</p>
  
  <p>I read that <code>reverse_url</code> was supposed to work, but this gave an error:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;li&gt; &lt;a href="{% reverse_url('login') %}"&gt;Login&lt;/a&gt; &lt;/li&gt;
  </code></pre>