title: How to use django-channels
body: <p>I need to use websocket in django, so I read docs of channels. Now I know the basic concepts but still confused because there's few code in detail.
  <br>
  <br>Here are  my questions:
  <br>How can I make ASGI align with the WSGI in code? In other words, how to configure <code>WSGI Server to ASGI</code> or <code>ASGI to WSGI application</code>?
  <br>Does it affect the way of using ajax?
  <br>Does it affect that if the django sends http request to other website?
  <br>Any help will be appreciated.</p>