WebSocket failed: Error during WebSocket handshake: Unexpected response code: 400

nginx 添加如下三行配置     proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade";   *** 代理哪个端口就配在哪个端口*** 参考：https://blog.csdn.net/cai454692590/article/details/9

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