title: problem in res.redirect after fetch operation
body: <p>i have a problem in <code>res.redirect</code> after <code>fetch</code> operation:</p>
  <p>in my project, i want to delete a user, then, after completing that DELETE operation, the client be <code>redirect</code> to a page.
  the <code>delete</code> operation goes successfully, but it do not goes to another page and gives error.</p>
  <p>my <code>fetch</code> code in <code>.ejs</code> tempelate:</p>
  <pre><code> if (result.isConfirmed) {
                      fetch(`/admin/users/${ID}/del?_method=delete&amp;_csrf=&lt;%= req.csrfToken()%&gt;`,{
                          method : &quot;DELETE&quot;,
                          headers: {
                              'Content-Type':'application/json',
                          },
                      }).then(res =&gt; res.json())
                          .catch(error =&gt; console.log('fetching ERROR&gt;&gt;',error));
              }
  </code></pre>
  <p>the controller mudule that,i want to delete user and then <code>redirect</code> to another page:</p>
  <pre><code> async destroy(req, res, next){
     try {
         this.isMongoId(req.params.id);
         let user = await User.findById(req.params.id)
             .populate({path: 'courses', populate: ['episodes']}).exec();
         if(!user) this.error(404,'Ooops! not exist such user!');
         // doing delete operation successfully.
         return  res.redirect('/admin/users');//**THIS LINE DON'T WORKS!
     } catch(error) {
        next(error);
     }
  </code></pre>
  <p>as i told , My problem is in 2'th step:</p>
  <p>Main steps of this codes:</p>
  <ol>
  <li>delete the given user(it is OK).</li>
  <li>after delete, be <code>redirect</code> to route of <code>/admin/users</code> but it gives
  such error:
  <a href="https://i.stack.imgur.com/stwoq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/stwoq.png" alt="enter image description here" /></a></li>
  </ol>
  <p>it should have beet told that:
  i have the route of <code>router.get('/admin/users',userController.index);</code>
  and this <code>redirect</code> strategy, acts successfully in all operations, unless that <code>fetch</code>!</p>
  <p>I DONT KNOW WHY?! WHAT IS PROBLEM!</p>