title: Slug route in cakephp 3
body: <p>I have this route and it's OK:</p>
  
  <pre><code>Router::connect('/tour/:slug', 
       ['controller' =&gt; 'Tours','action' =&gt; 'view'],
       ['slug'=&gt;'[^\/]+','pass'=&gt;['slug']]
  );
  </code></pre>
  
  <p>I want remove "/tour" , but it has Missing Controller error:</p>
  
  <pre><code>Router::connect('/:slug', 
       ['controller' =&gt; 'Tours','action' =&gt; 'view'],
       ['slug'=&gt;'[^\/]+','pass'=&gt;['slug']]
  );
  </code></pre>
  
  <p>error page (in request: <a href="http://localhost/nextholiday/a_slug" rel="nofollow noreferrer">http://localhost/nextholiday/a_slug</a> ):
   <a href="https://i.stack.imgur.com/SG1rE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SG1rE.png" alt="enter image description here"></a></p>
  
  <p>what should I do?</p>