通过NGINX反向代理进行Socket.io 404

Question

这是我的问题：socket.io握手得到404。

我有一个像这样的nginx反向代理配置：

location /socket.io/ {
                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;
                proxy_pass              "http://localhost:3000";
        }

奇怪的是，如果我转到该网址，我会得到答案

http://ipofmyserver:3000/socket.io/?EIO=3etc...

但是日志告诉我，请求已代理到该确切地址...

Connection refused while connecting to upstream, client: [...], server: [...], request: "GET /socket.io/?EIO=3&transport=polling&t=N4DgMW5 HTTP/2.0", upstream: "http://[...]:3000/socket.io/?EIO=3&transport=polling&t=N4DgMW5", host: "[...]", referrer: "[...]"

所以上游正是我手动测试的地址，但是经过nginx时它返回404 ...

感谢任何人回答！