@abc.abstractmethod<EOL><INDENT>def get_uri(self, request):<DEDENT>
This method extracts a uri from the request. This is the uri that needs to be checked.

:param request: :class:`pyramid.request.Request` with useful configuration information and connections
                of the application (registry, route_url, session) to determine the references
:rtype: string uri: URI of the resource we need to check for