CORS 在特定应用程序中不起作用 - Django

Question

我有一个名为 auth 的现有应用程序，它允许新用户在登录后创建帐户或获取授权令牌。这里一切似乎都很好。不存在 CORS 问题，但是当我启动一个名为 Blog 的新应用程序并尝试通过 Axios 请求访问其视图时，我收到 CORS 错误：即使我的 CORS 策略已初始化，也无法访问允许源头。

这是我的 settings.py 的片段：

Django settings for backend project.

Generated by 'django-admin startproject' using Django 3.2.9.

For more information on this file, see
https://docs.djangoproject.com/en/3.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/3.2/ref/settings/
"""

from pathlib import Path
import os

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent

# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'django-insecure-3mr!aqng!tc!*ko7i!*&y9x8k-*y$@1pc+$g!_^-aol4!vd@tn'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

# Application definition
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',

    'rest_framework',
    'rest_framework.authtoken',
    'django_rest_passwordreset',

    'corsheaders',

    'auth_app',
    'blog'
]

MIDDLEWARE = [
    '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',
    'corsheaders.middleware.CorsMiddleware',
]

ROOT_URLCONF = 'backend.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'backend.wsgi.application'
# Database
# https://docs.djangoproject.com/en/3.2/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'db.sqlite3',
    }
}

# Password validation
# https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators

REST_FRAMEWORK = {
    'DEFAULT_RENDERER_CLASSES': [
        'rest_framework.renderers.JSONRenderer',
    ],
    'DEFAULT_PARSER_CLASSES': [
        'rest_framework.parsers.JSONParser',
    ],
    "DEFAULT_AUTHENTICATION_CLASSES": [
        'rest_framework.authentication.TokenAuthentication'
    ],
}

AUTH_PWD_MODULE="django.contrib.auth.password_validation."

AUTH_PASSWORD_VALIDATORS = [
    {
        "NAME": f"{AUTH_PWD_MODULE}UserAttributeSimilarityValidator",
    },
    {
        "NAME": f"{AUTH_PWD_MODULE}MinimumLengthValidator",
    },
    {
        "NAME": f"{AUTH_PWD_MODULE}CommonPasswordValidator",
    },
    {
        "NAME": f"{AUTH_PWD_MODULE}NumericPasswordValidator",
    },
]

ACCOUNT_AUTHENTICATION_METHOD = 'email'
ACCOUNT_EMAIL_REQUIRED = True
ACCOUNT_USERNAME_REQUIRED = False

# Internationalization
# https://docs.djangoproject.com/en/3.2/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.2/howto/static-files/

STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, "static")

MEDIA_ROOT =  os.path.join(BASE_DIR, 'uploads')
MEDIA_URL = '/uploads/'

# Default primary key field type
# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

#CORS
CORS_ORIGIN_ALLOW_ALL = True

如您所见，CORS 已按应有的方式初始化，甚至我的身份验证应用程序也能正常使用它。那么，当我尝试访问博客应用程序的端点时，为什么会发生这种情况？

Answer 1

跟进@jub0bs 的评论 - 我同意您遇到的问题可能是由于 CORS 中间件组件位于已安装中间件列表的底部。尝试将此中间件组件移至中间件列表的顶部，看看是否能解决问题。

如django-cors-headers GitHub page所述：

CorsMiddleware 应该放在尽可能高的位置，尤其是在任何可以生成响应的中间件之前，例如 Django 的 CommonMiddleware 或 Whitenoise 的 WhiteNoiseMiddleware。如果不是之前，它将无法将 CORS headers 添加到这些响应中。

CORS 在特定应用程序中不起作用 - Django

CORS not working in specific app - Django

django

backend

cors