Nginx 301重定向规则
示例1：
将 app.xxxx.com/index 301到到 www.xxxx.com，
#REWRITE-START
rewrite ^/index$ https://www.xxxx.com permanent;
#REWRITE-END示例1：
将 app.xxxx.com/index 301到到 www.xxxx.com，
#REWRITE-START
rewrite ^/index$ https://www.xxxx.com permanent;
#REWRITE-END