docs: def get_proxy(self, input_):
          """Gets a proxy.
  
          arg:    input (osid.proxy.ProxyCondition): a proxy condition
          return: (osid.proxy.Proxy) - a proxy
          raise:  NullArgument - ``input`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          raise:  Unsupported - ``input`` is not of this service
          *compliance: mandatory -- This method is must be implemented.*
  
          """
          if input_._http_request is not None:
              authentication = Authentication()
              authentication.set_django_user(input_._http_request.user)
          else:
              authentication = None
          effective_agent_id = input_._effective_agent_id
          # Also need to deal with effective dates and Local
          return rules.Proxy(authentication=authentication,
                             effective_agent_id=effective_agent_id)