Handshake failed due to invalid Upgrade header: null 解决方案

解决方案，在  Nginx  ，location 中添加以下红色代码：

proxy_set_header Upgrade $http_upgrade;

proxy_set_header Connection  "upgrade";

 

                server {
                        listen 80;
                        server_name localhost;


                        location / {
                                proxy_set_header X-Real-IP $remote_addr;
                                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                                proxy_set_header Host $http_host;
                                proxy_set_header X-NginX-Proxy true; 

                                # prevents 502 bad gateway error
                                proxy_buffers 8 32k;
                                proxy_buffer_size 64k;

                                proxy_pass http://127.0.0.1:8080;
                                proxy_redirect off;

                                # enables WS support
                                proxy_http_version 1.1;
                                proxy_set_header Upgrade $http_upgrade;
                                proxy_set_header Connection  "upgrade";
                        }
                }