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

　　微信小程序webSocket使用，本地开发环境没问题，QA环境报错：

org.springframework.web.socket.server.support.DefaultHandshakeHandler : Handshake failed due to invalid Upgrade header: null

　　前端报错：

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

　　经过比较后发现，QA环境使用nginx反向代理服务器忽略了headers中的：Upgrade:websocket。

　　解决办法：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";
        }
}

　　使得请求中包含Upgrade。