Django snippets

class RequestStackMiddleware(object):
    '''
    Keeps track of the last 3 succesful requests
    '''
    def process_response(self, request, response):
        if 'requeststack' not in request.session:
            request.session['requeststack'] = ['/', '/', request.path]
        else:
            if request.method == 'GET' and 'text/html' in response.headers['Content-Type']:
                stack = request.session['requeststack']
                stack = stack[1:] # remove the first item
                stack.append(request.path)
                request.session['requeststack'] = stack
        
        return response

In a view:
    return HttpResponseRedirect(request.session['requeststack'][-1]) # or -2 or -3