title: Django Allowed_Hosts Error.
body: <p>I'm trying to run a django server with  ./manage.py runserver</p>
  
  <p>But appears this error:</p>
  
  <pre><code>Invalid HTTP_HOST header: '127.0.0.1:8000'. You may need to add '127.0.0.1' to ALLOWED_HOSTS.
  </code></pre>
  
  <p>Please help me.</p>