public function index()
{
$cid = get_cid();
if(!$cid){
throw new \think\exception\HttpException(404, '当前栏目不存在!', null);
}
$channel = Db::name('channel')->where('id',$cid)->find();
if(trim($channel['domain'])){
redirect($channel['domain']);
| USER | nobody | 
| HOME | / | 
| HTTP_CACHE_CONTROL | max-age=259200 | 
| HTTP_VIA | 1.1 squid-proxy-5b5d847c96-75tll (squid/6.13) | 
| HTTP_ACCEPT_ENCODING | gzip, br, zstd, deflate | 
| HTTP_USER_AGENT | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com) | 
| HTTP_ACCEPT | */* | 
| HTTP_CONNECTION | close | 
| HTTP_X_FORWARDED_PROTO | http | 
| HTTP_REMOTE_HOST | 216.73.216.176 | 
| HTTP_X_FORWARDED_FOR | 10.2.96.87, 216.73.216.176 | 
| HTTP_X_REAL_IP | 216.73.216.176 | 
| HTTP_HOST | cxkjsw168.com | 
| REDIRECT_STATUS | 200 | 
| SERVER_NAME | wh-nadc06qw24ve0z2sfec.my3w.com | 
| SERVER_PORT | 80 | 
| SERVER_ADDR | 10.0.35.44 | 
| REMOTE_PORT | |
| REMOTE_ADDR | 216.73.216.176 | 
| SERVER_SOFTWARE | nginx/1.18.0 | 
| GATEWAY_INTERFACE | CGI/1.1 | 
| REQUEST_SCHEME | http | 
| SERVER_PROTOCOL | HTTP/1.0 | 
| DOCUMENT_ROOT | /data/user/htdocs | 
| DOCUMENT_URI | /index.php | 
| REQUEST_URI | /sitemap.xml | 
| SCRIPT_NAME | /index.php | 
| CONTENT_LENGTH | |
| CONTENT_TYPE | |
| REQUEST_METHOD | GET | 
| QUERY_STRING | s=/sitemap.xml | 
| PATH_INFO | |
| SCRIPT_FILENAME | /data/user/htdocs/index.php | 
| FCGI_ROLE | RESPONDER | 
| PHP_SELF | /index.php | 
| REQUEST_TIME_FLOAT | 1761895986.0667 | 
| REQUEST_TIME | 1761895986 | 
| BASE_PATH | /data/user/htdocs/ | 
| url | /sitemap.xml | 
| ref | |
| ent | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com) | 
| refs | @baidu|Sogou|Yisou|Haosou|so| toutiao@i | 
| regs | @BaiduSpider|Sogou|Yisou|Haosou|360Spider@i | 
| mobile | /phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone/ | 
| area | false | 
| PINYIN_DEFAULT | 4096 | 
| PINYIN_TONE | 2 | 
| PINYIN_NO_TONE | 4 | 
| PINYIN_ASCII_TONE | 8 | 
| PINYIN_NAME | 16 | 
| PINYIN_KEEP_NUMBER | 32 | 
| PINYIN_KEEP_ENGLISH | 64 | 
| PINYIN_UMLAUT_V | 128 | 
| PINYIN_KEEP_PUNCTUATION | 256 |