Axios 通过 Django REST Framework 被 CORS 策略阻止

我正在尝试使用 Axios 向我的 API（Django REST Framework）发出请求，但出现以下错误：

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.

当你使用 cUrl 来检查时甚至很困难：

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时：

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.

问题是 API 启用了 CORS，但我无法使其在我的 Web 应用程序中与 Axios 和 React 一起使用。

UPDATE:

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

这是因为您忘记了网址末尾的“/”。

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