nginx websocket socket.io 400 错误 ​

在location中加入：

proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";

然后重启nginx即可

参考链接：

https://ask.csdn.net/questions/249716

https://www.cnblogs.com/pangyangqi/p/9711317.html