Класс RedirectView (Django 2.1)

def _allowed_methods(self):
    return [m.upper() for m in self.http_method_names if hasattr(self, m)]

@classonlymethod
def as_view(cls, **initkwargs):
    """Main entry point for a request-response process."""
    for key in initkwargs:
        if key in cls.http_method_names:
            raise TypeError("You tried to pass in the %s method name as a "
                            "keyword argument to %s(). Don't do that."
                            % (key, cls.__name__))
        if not hasattr(cls, key):
            raise TypeError("%s() received an invalid keyword %r. as_view "
                            "only accepts arguments that are already "
                            "attributes of the class." % (cls.__name__, key))
    def view(request, *args, **kwargs):
        self = cls(**initkwargs)
        if hasattr(self, 'get') and not hasattr(self, 'head'):
            self.head = self.get
        self.request = request
        self.args = args
        self.kwargs = kwargs
        return self.dispatch(request, *args, **kwargs)
    view.view_class = cls
    view.view_initkwargs = initkwargs
    # take name and docstring from class
    update_wrapper(view, cls, updated=())
    # and possible attributes set by decorators
    # like csrf_exempt from dispatch
    update_wrapper(view, cls.dispatch, assigned=())
    return view

def delete(self, request, *args, **kwargs):
    return self.get(request, *args, **kwargs)

def dispatch(self, request, *args, **kwargs):
    # Try to dispatch to the right method; if a method doesn't exist,
    # defer to the error handler. Also defer to the error handler if the
    # request method isn't on the approved list.
    if request.method.lower() in self.http_method_names:
        handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
    else:
        handler = self.http_method_not_allowed
    return handler(request, *args, **kwargs)

def get(self, request, *args, **kwargs):
    url = self.get_redirect_url(*args, **kwargs)
    if url:
        if self.permanent:
            return HttpResponsePermanentRedirect(url)
        else:
            return HttpResponseRedirect(url)
    else:
        logger.warning(
            'Gone: %s', request.path,
            extra={'status_code': 410, 'request': request}
        )
        return HttpResponseGone()

def get_redirect_url(self, *args, **kwargs):
    """
    Return the URL redirect to. Keyword arguments from the URL pattern
    match generating the redirect request are provided as kwargs to this
    method.
    """
    if self.url:
        url = self.url % kwargs
    elif self.pattern_name:
        url = reverse(self.pattern_name, args=args, kwargs=kwargs)
    else:
        return None
    args = self.request.META.get('QUERY_STRING', '')
    if args and self.query_string:
        url = "%s?%s" % (url, args)
    return url

def head(self, request, *args, **kwargs):
    return self.get(request, *args, **kwargs)

def http_method_not_allowed(self, request, *args, **kwargs):
    logger.warning(
        'Method Not Allowed (%s): %s', request.method, request.path,
        extra={'status_code': 405, 'request': request}
    )
    return HttpResponseNotAllowed(self._allowed_methods())

def __init__(self, **kwargs):
    """
    Constructor. Called in the URLconf; can contain helpful extra
    keyword arguments, and other things.
    """
    # Go through keyword arguments, and either save their values to our
    # instance, or raise an error.
    for key, value in kwargs.items():
        setattr(self, key, value)

def patch(self, request, *args, **kwargs):
    return self.get(request, *args, **kwargs)

def post(self, request, *args, **kwargs):
    return self.get(request, *args, **kwargs)

def put(self, request, *args, **kwargs):
    return self.get(request, *args, **kwargs)