一、问题

如果使用nginx代理tomcat等，如果有以下错误日志：

Handshake failed due to invalid Upgrade header: null

二、解决方案

解决方案，在 Nginx ，location 中添加以下代码：

proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";

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    server {
        listen       80;
        server_name  wno704.top;

        error_page   500 502 503 504  /50x.html;

        location / {
            root   html;
            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;
            fastcgi_param  HTTP_X_FORWARDED_FOR $http_x_forwarded_for;
            proxy_set_header User-Agent $http_user_agent;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection  "upgrade";
            proxy_pass http://blogServer;
        }

    }