Axios 被 Django REST 框架的 CORS 策略阻止

Question

我正在嘗試使用 Axios 向我的 API（Django REST 框架）發出請求，但出現以下錯誤：

Access to XMLHttpRequest at 'http://trvl.hopto.org:8000/api/airports/MSP/routes' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

當你使用 cUrl 來檢查時，甚至很難：

curl -I -X GET   -H "Origin: http://localhost:3000"   -H 'Access-Control-Request-Method: GET'   http://trvl.hopto.org:8000/api/airports/MSP/routes 2>&1 | grep 'Access-Control-Allow-Origin'
Response: Access-Control-Allow-Origin: *

Full response from cUrl Options:
OPTIONS request: curl -I -X OPTIONS   -H "Origin: http://localhost:3000"   -H 'Access-Control-Request-Method: GET'   http://trvl.hopto.org:8000/api/airports/MSP/routes
HTTP/1.1 200 OK
Date: Wed, 27 Mar 2019 10:58:01 GMT
Server: WSGIServer/0.2 CPython/3.6.8
Content-Type: text/html; charset=utf-8
Content-Length: 0
Vary: Origin
Access-Control-Allow-Origin: *
Access-Control-Allow-Headers: accept, accept-encoding, authorization, content-type, dnt, origin, user-agent, x-csrftoken, x-requested-with
Access-Control-Allow-Methods: DELETE, GET, OPTIONS, PATCH, POST, PUT
Access-Control-Max-Age: 86400

使用 Axios 時：

let url = 'http://A.hopto.org:8000/api/airports/MSP/routes';

axios.get(url)
      .catch((err) => {
        console.error(err);
      })
      .then((response, ) => {
        console.log(response);
      });


Response:
Access to XMLHttpRequest at 'http://API.hopto.org:8000/api/airports/MSP/routes' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

問題是 API 啟用了 CORS，但我無法讓它在我的 WebApp 中與 Axios 和 React 一起使用。

更新：

Here is my Django settings.py I'm using the https://github.com/ottoyiu/django-cors-headers module.

**settings.py**

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

ALLOWED_HOSTS = ['*']

# Application definition

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

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.common.CommonMiddleware',
    #'corsheaders.middleware.CorsPostCsrfMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware'
]

CORS_ORIGIN_ALLOW_ALL = True

Answer 1

這是因為您忘記了網址末尾的“/”。

let url = 'http://A.hopto.org:8000/api/airports/MSP/routes/';

Answer 2

在您的后端代碼中，您需要添加http://localhost:3000作為字段Access-Control-Allow-Origin的響應標頭的一部分

還要確保您的響應具有此字段Access-Control-Allow-Methods include GET

您提到您的后端 API 代碼啟用了 CORS。 如果上述方法不起作用，您可以更新您的帖子以包括您的設置方式嗎？

Answer 3

我需要將http://前綴添加到我的localhost:8000 url