Django CORS问题：不允许access-control-allow-origin

Question

我收到以下错误：

Access to XMLHttpRequest at 'http://127.0.0.1:8000/' from origin 'http://localhost:62570' has been blocked by CORS policy: Request header field access-control-allow-origin is not allowed by Access-Control-Allow-Headers in preflight response.

我尝试添加django-cors-headers中间件，并且CORS_ALLOW_ALL_ORIGINS = True我也做了ALLOWED_HOSTS = ['*']但仍然遇到相同的 CORS 错误。我在 NestJS 中遇到了同样的错误，但添加后app.enableCors();它得到了解决。

这是我的settings.py文件：

from pathlib import Path

BASE_DIR = Path(__file__).resolve(strict=True).parent.parent
DEBUG = True

ALLOWED_HOSTS = ['*']

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'corsheaders',
    'rest_framework',
]

MIDDLEWARE = [
    'corsheaders.middleware.CorsMiddleware',
    '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',
]
ROOT_URLCONF = 'basic_app.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 = 'basic_app.wsgi.application'
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'db.sqlite3',
    }
}
AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]
LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'UTC'
USE_I18N = True
USE_L10N = True
USE_TZ = True
STATIC_URL = '/static/'

# CORS
CORS_ALLOW_ALL_ORIGINS = True

# CORS_ALLOWED_ORIGINS = [
#     "http://localhost:62570",
#     "https://example.com",
#     "https://sub.example.com",
#     "http://localhost:8080",
#     "http://127.0.0.1:9000"
# ]

Answer 1

您还需要CORS_ALLOW_CREDENTIALS，因为 django 需要 CSRF cookie 来验证请求。

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如果为 True，则允许在跨站点 HTTP 请求中包含 cookie。默认为 False。注意：在 Django 2.1 中添加了 SESSION_COOKIE_SAMESITE 设置，默认设置为“Lax”，这将阻止 Django\xe2\x80\x99s 会话 cookie 跨域发送。将其更改为 None 以绕过此安全限制。

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