Nginx，flask-socketio -被CORS策略阻止

Question

我有一个运行在ubuntu和nginx上的flask-socketio服务器。我有一个客户端在调用服务器。当我尝试调用服务器时，我收到以下错误：

has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values '*, *, *, *, *, *, *, *, *, *, *, *, *, *, *, *, *', but only one is allowed.

这是我用flask进行的初始化：

socketio = SocketIO(app, cors_allowed_origins='*', async_mode='eventlet')

..。

if __name__ == '__main__':
    socketio.run(app, host="0.0.0.0", port='80', debug=False)

这是我在nginx中的当前配置：

server {
    listen 80;
    server_name server-address;

    location / {
    include proxy_params;
    proxy_pass http://server-address;
    include uwsgi_params;
    uwsgi_pass unix:/home/user/project/project.sock;
    }

    location /socket.io{
    include proxy_params;
    add_header "Access-Control-Allow-Origin" "*" always;
    proxy_http_version 1.1;
    proxy_buffering off;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
    proxy_pass http://server-address/socket.io;
    }
}

从客户端到服务器的请求如下所示：

http://server-address/socket.io/?EIO=3&transport=polling&t=1617406124248-38

我试过了：

-Adding只允许CORS到location /和两者。-在flask应用中删除/添加允许CORS原点。

有人能帮上忙吗？

Answer 1

请添加您的Nginx conf

proxy_hide_header Access-Control-Allow-Origin

然后重新加载Nginx并尝试。