Ratelimit Keys

The key= argument to the decorator takes either a string or a callable.

Common keys

The following string values for key= provide shortcuts to commonly used ratelimit keys:

  • 'ip' - Use the request IP address (i.e. request.META['REMOTE_ADDR'])


    If you are using a reverse proxy, make sure this value is correct or use an appropriate header: value. See the security notes.

  • 'get:X' - Use the value of request.GET.get('X', '').

  • 'post:X' - Use the value of request.POST.get('X', '').

  • 'header:x-x' - Use the value of ``request.META.get(‘HTTP_X_X’,



    The value right of the colon will be translated to all-caps and any dashes will be replaced with underscores, e.g.: x-client-ip => X_CLIENT_IP.

  • 'user' - Use an appropriate value from request.user. Do not use with unauthenticated users.

  • 'user_or_ip' - Use an appropriate value from request.user if the user is authenticated, otherwise use request.META['REMOTE_ADDR'] (see the note above about reverse proxies).


Missing headers, GET, and POST values will all be treated as empty strings, and ratelimited in the same bucket.


Using user-supplied data, like data from GET and POST or headers directly from the User-Agent can allow users to trivially opt out of ratelimiting. See the note in the security chapter.

String values

Other string values not from the list above will be treated as the dotted Python path to a callable. See below for more on callables.

Callable values

New in version 0.3.

Changed in version 0.5: Added support for python path to callables.

Changed in version 0.6: Callable was mistakenly only passed the request, now also gets group as documented.

If the value of key= is a callable, or the path to a callable, that callable will be called with two arguments, the group and the request object. It should return a bytestring or unicode object, e.g.:

def my_key(group, request):
    return request.META['REMOTE_ADDR'] + request.user.username