websocket部署到Linux服务器，使用wss访问报错400?报错

Nginx的原因。Nginx必须在websocket对应的location上加上代理头，使用Http的Upgrade和Connection协议头升级Http 1.1协议，以支持websocket：

location /your_websocket_uri {
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
}

https://www.nginx.com/blog/websocket-nginx/

                    <div class='ref'><h4>引用来自“CoserSeu”的评论</h4><p>Nginx的原因。Nginx必须在websocket对应的location上加上代理头，使用Http的Upgrade和Connection协议头升级Http 1.1协议，以支持websocket：</p> 

location /your_websocket_uri {
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
}

https://www.nginx.com/blog/websocket-nginx/