Flas-Restful Звонок перед запросом

Вы также можете использовать method_decorators для спокойного объекта Resource.

class Resource(MethodView):
    """
    Represents an abstract RESTful resource. Concrete resources should
    extend from this class and expose methods for each supported HTTP
    method. If a resource is invoked with an unsupported HTTP method,
    the API will return a response with status 405 Method Not Allowed.
    Otherwise the appropriate method is called and passed all arguments
    from the url rule used when adding the resource to an Api instance. See
    :meth:`~flask_restful.Api.add_resource` for details.
    """
    representations = None
    method_decorators = []

Если вы посмотрите на исходный код, он применит декораторы по порядку:

for decorator in self.method_decorators:
    meth = decorator(meth)

resp = meth(*args, **kwargs)

if isinstance(resp, ResponseBase):  # There may be a better way to test
    return resp

representations = self.representations or OrderedDict()