Getting error on sending a request

Using Django Mystery Errors
1

When I send a request to my API I get following error -

  File "C:\Users\Harsh\Desktop\frontend\Deploy_Backend\env\Lib\site-packages\django\core\handlers\exception.py", line 55, in inner
    response = get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Harsh\Desktop\frontend\Deploy_Backend\env\Lib\site-packages\django\utils\deprecation.py", line 131, in __call__
    if self._is_coroutine:
       ^^^^^^^^^^^^^^^^^^
AttributeError: 'CustomRateThrottle' object has no attribute '_is_coroutine'

This the CustomRateThrottle -

from django.core.cache import cache
from django.utils.cache import get_cache_key
from django.utils.deprecation import MiddlewareMixin
from django.conf import settings
from django.http import HttpResponse
from django.core.exceptions import ValidationError
from django.urls import resolve
from collections import defaultdict
import time



class CustomRateThrottle(MiddlewareMixin):
    def __init__(self, get_response=None):
        self.get_response = get_response
        self.throttle_rates = getattr(settings, 'THROTTLE_RATES', {})
        self.cache = cache

    def process_request(self, request):
        self.parse_rate()
        if not self.should_be_throttled(request):
            return None
        return self.throttled_response(request)

    def parse_rate(self):
        self.rates = defaultdict(lambda: (None, None))
        for key, value in self.throttle_rates.items():
            try:
                rate, interval = value.split('/')
                self.rates[key] = (int(rate), int(interval))
            except (ValueError, TypeError):
                pass

    def should_be_throttled(self, request):
        view_func = resolve(request.path_info).func
        if hasattr(view_func, 'throttle_scope'):
            self.scope = view_func.throttle_scope
            self.rate, self.interval = self.rates.get(self.scope, (None, None))
            if self.rate is None or self.interval is None:
                return False
            self.history_key = get_cache_key(request)
            self.history = self.cache.get(self.history_key, [])
            self.now = time.time()
            self.history = [x for x in self.history if x > self.now - self.interval]
            if len(self.history) >= self.rate:
                return True
        return False

    def throttled_response(self, request):
        return HttpResponse(status=429)

And setings.py -

MIDDLEWARE = [
    "corsheaders.middleware.CorsMiddleware",
    "django.middleware.common.CommonMiddleware",
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'files.throttling.CustomRateThrottle',

]

I don’t know where to fix this.

2

What version of Django are you using?

4

I am currently using Django 4.1

5

Looks like you need to add super().__init__() to your middleware so MiddlewareMixin.__init__() runs.