title: Insomnia rest client error
body: <p>When I do a POST request I am getting this error.
  Error: connect ECONNREFUSED 127.0.0.1:3000.
  On the contrary, when I use postman it works.</p>
  
  <p>This is the url:
  <a href="http://localhost:3000/users/sign_in" rel="nofollow">http://localhost:3000/users/sign_in</a></p>
  
  <p>And this is my configuration:</p>
  
  <p>JSON tab:</p>
  
  <pre><code>{"user": {"email": "user@nivelr.com", "password": "clave12345"}}
  </code></pre>
  
  <p>Headers:</p>
  
  <ul>
  <li>Accept        application/json</li>
  <li>Content-Type  application/json</li>
  </ul>