Django跨域配置

setting.py中找到下述代码位置进行配置，INSTALLED_APPS和MIDDLEWARE 一定要注意添加的位置

INSTALLED_APPS = [    
    'corsheaders',# 新加，注意位置    
    'django.contrib.admin',    
    'django.contrib.auth',    
    'django.contrib.contenttypes',    
    'django.contrib.sessions',    
    'django.contrib.messages',    
    'django.contrib.staticfiles',    
    'polls.apps.PollsConfig', # 配置应用 
] 
MIDDLEWARE = [    
    'django.middleware.security.SecurityMiddleware',    
    'django.contrib.sessions.middleware.SessionMiddleware',    
    'corsheaders.middleware.CorsMiddleware', # 新加，注意位置    
    'django.middleware.common.CommonMiddleware',    
    # 关闭Django的csrf保护机制    
    'django.middleware.csrf.CsrfViewMiddleware',    
    'django.contrib.auth.middleware.AuthenticationMiddleware',    
    'django.contrib.messages.middleware.MessageMiddleware',    
    'django.middleware.clickjacking.XFrameOptionsMiddleware', 
]     
CORS_ALLOW_CREDENTIALS = True 
CORS_ORIGIN_ALLOW_ALL = True 
# 允许所有的请求头 
CORS_ALLOW_HEADERS = (' * ')