1.创建目录
mkdir -p /home/wwwroot/20/explorer
echo "Explorer Limit">/home/wwwroot/20/explorer/index.html
2.修改配置文件,只有火狐浏览器才可以访问
<Directory /home/wwwroot/20/explorer>
SetEnvIf User-Agent "Firefox" ff=1
Order allow,deny
#将源主机与允许规则进行匹配,若匹配成功则允许访问请求,反之则拒绝
Allow from env=ff
</Directory>