1.http中配置 $connection_upgrade 否则报错

http {
	   map $http_upgrade $connection_upgrade {
	    default upgrade;
	    ''      close;
	}
}

2.具体配置部分：

 location /message {
        proxy_pass http://127.0.0.1:8100;   需要代理的后端ip
        proxy_read_timeout 300s;
        proxy_send_timeout 300s;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }