'Ensure client is authorized to redirect to the redirect_uri requested.
All clients should register the absolute URIs of all URIs they intend
to redirect to. The registration is outside of the scope of oauthlib.
:param client_id: Unicode client identifier
:param redirect_uri: Unicode absolute URI
:param request: The HTTP Request (oauthlib.common.Request)
:rtype: True or False
Method is used by:
- Authorization Code Grant
- Implicit Grant'

def validate_redirect_uri(self, client_id, redirect_uri, request, *args, **kwargs):

    raise NotImplementedError(u'Subclasses    must    implement    this    method.')
