我正在尝试连接到一个运行在Nginx反向代理后面的socket.io服务器。我的Nginx代理服务器使用https confighttps://api.xxx.com运行。节点js socket.io服务器正在另一台服务器上运行http confighttp://a.b.c.d:8081/app/v2。

在android端作为套接字客户端，我使用implementation'com.github.nkzawa:socket.io-client:0.3.0。

代理的配置如下:

location /app/v2 {

            proxy_cache apicache;
            proxy_cache_revalidate on;
            proxy_cache_min_uses 2;
            proxy_cache_use_stale error timeout updating http_500 http_502
                          http_503 http_504;
            proxy_cache_lock on;
            proxy_cache_bypass $http_cache_control;
            add_header X-Proxy-Cache $upstream_cache_status;
            proxy_cache_methods GET;
            proxy_cache_valid 200 302 2s;
            proxy_cache_valid 404 1m;

            proxy_pass http://a.b.c.d:8081/app/v2;

            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_cache_bypass $http_upgrade;

    }

节点js服务器:

socketio = socketio.listen(server);
socketio.set('transports', ['websocket']);
socketio.of('/app/v2/socketio/livefeed/').on('connection', function (socket) {
    console.log("device connected");
    socket.emit('clientAction','connected');
    socket.on('disconnect', function () {
        console.log("device disconnected");
        socket.emit('clientAction','disconnected');
    });
});

在尝试将android应用程序连接到socket时，如下所示

`try { 
    mSocket = IO.socket("https://api.xxx.com/app/v2/socketio/livefeed/");
 } catch (URISyntaxException e) { 
    Log.d(TAG, String.valueOf(e)); 
 } 
 mSocket.connect();`

套接字客户端未连接到socket.io服务器。代理服务器后面的android socket客户端应该如何连接socket服务器呢？