参考：
https://blog.csdn.net/zqh123zqh/article/details/112795608

添加：

proxy_read_timeout 600s; 

例如：

server {
		listen 80;
		server_name carrefourzone.senguo.cc;
		#error_page 502 /static/502.html;
 
		location /static/ {
		    root /home/chenming/Carrefour/carrefour.senguo.cc/source;
		    expires 7d;
        	}
 
		location / {
		    proxy_pass_header Server;
		    proxy_set_header Host $http_host;
		    proxy_redirect off;
		    proxy_set_header X-Real-IP $remote_addr;
		    proxy_set_header X-Scheme $scheme;
		    proxy_pass       http://127.0.0.1:9887;
		    proxy_http_version  1.1;
		    proxy_set_header    Upgrade    "websocket";
		    proxy_set_header    Connection "Upgrade";
		    proxy_read_timeout 600s; 
		}
}