为IT服务 [龙飞的博客]

location ~* ^.+\.(gif|jpg|png|swf|flv|mp3|zip|rar)$ {
        valid_referers none blocked server_names  *.sitea.com *.siteb.com;
        if ($invalid_referer) {
            rewrite ^/   http://www.site.com/;
            #return 404;
        }
    }