python - 即使在 Django Rest Framework 中配置了所有内容,我也收到“请求的资源上不存在 Access-Control-Allow-Origin 标头”
问题描述
即使进行了所有配置,当我尝试通过XMLHttpRequest
(使用 Axios)访问我的 DRF Api 时,我收到以下错误:
Access to XMLHttpRequest at 'http://127.0.0.1:8000/api/posts' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
当我使用 Postman 时,我没有任何错误。
设置.py
import os
import django_heroku
from decouple import config
from dj_database_url import parse as dburl
# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
SECRET_KEY = config('SECRET_KEY')
DEBUG = config('DEBUG')
ALLOWED_HOSTS = ['ablog-back.herokuapp.com', 'localhost:3000']
# Application definition
CORS_ORIGIN_ALLOW_ALL = True
# CORS_ORIGIN_WHITELIST = (
# 'http://localhost:3000',
# )
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'rest_framework',
'corsheaders',
'ablogback.api',
]
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 = 'ablogback.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 = 'ablogback.wsgi.application'
# Database
# https://docs.djangoproject.com/en/3.0/ref/settings/#databases
default_dburl = 'sqlite:///' + os.path.join(BASE_DIR, 'db.sqlite3')
DATABASES = {
'default': config('DATABASE_URL', default=default_dburl, cast=dburl),
}
# Password validation
# https://docs.djangoproject.com/en/3.0/ref/settings/#auth-password-validators
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',
},
]
# Internationalization
# https://docs.djangoproject.com/en/3.0/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/3.0/howto/static-files/
STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')
# Configure Django App for Heroku.
django_heroku.settings(locals())
要求.txt
asgiref==3.2.10
dj-database-url==0.5.0
dj-static==0.0.6
Django==3.0.8
django-cors-headers==3.4.0
django-heroku==0.3.1
djangorestframework==3.11.0
gunicorn==20.0.4
psycopg2==2.8.5
python-decouple==3.3
pytz==2020.1
sqlparse==0.3.1
static3==0.7.0
whitenoise==5.1.0
axios 请求
const { url, method, onSuccess, onError } = action.payload
try {
const response = await axios.request({
baseURL: 'http://127.0.0.1:8000/api/',
url, //posts/
method, //get
})
dispatch({
type: onSuccess,
payload: response.data
})
} catch(error) {
console.log('error', error)
dispatch({
type: onError,
payload: error
})
}
编辑1:
这是 Chrome 开发工具/网络选项卡中显示的内容:
解决方案
我发现了问题:\
URL 末尾缺少一个。
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