title: Django Rest Framework custom authentication
body: <p><a href="http://www.django-rest-framework.org/api-guide/authentication/#custom-authentication" rel="noreferrer">Django rest framework: Custom Authentication</a></p>
  <p>I want to use custom authentication in my Django app but cannot find how to apply this. The example given in the documentation is clear to me but they did not mention where to create this new class and how to use this.</p>