SEO: Handling External Links

This method works for websites built with WordPress or other platforms. Some of the information comes from Zhang Ge's blog: https://zhang.ge/5086.html

Step 1: Create a go.php file in the website's root directory with the following content:

 384 ||
    strpos($_SERVER['REQUEST_URI'], "eval(") ||
strpos($_SERVER['REQUEST_URI'], "base64")) {
@header("HTTP/1.1 414 Request-URI Too Long");
@header("Status: 414 Request-URI Too Long");
@header("Connection: Close");
@exit;
}
//Get the full input from QUERY_STRING, then extract everything after url= for better compatibility
$t_url = preg_replace('/^url=(.*)$/i','$1',$_SERVER["QUERY_STRING"]);
 
//Define custom external links here, for example: /go/woodchen redirects to https://woodchen.ink
if($t_url=="woodchen" ) {
   $t_url="https://woodchen.ink";
} elseif($t_url=="baidu") {
   $t_url="https://www.baidu.com/";
}
 
//Process the input
if(!empty($t_url)) {
    //Check whether the value is encoded
    if ($t_url == base64_encode(base64_decode($t_url))) {
        $t_url =  base64_decode($t_url);
    }
    //Validate the value as a URL
    preg_match('/^(http|https|thunder|qqdl|ed2k|Flashget|qbrowser):\/\//i',$t_url,$matches);
if($matches){
    $url=$t_url;
    $title='页面加载中,请稍候...';
} else {
    preg_match('/\./i',$t_url,$matche);
    if($matche){
        $url='http://'.$t_url;
        $title='页面加载中,请稍候...';
    } else {
        $url = 'http://'.$_SERVER['HTTP_HOST'];
        $title='参数错误，正在返回首页...';
    }
}
} else {
    $title = '参数缺失，正在返回首页...';
    $url = 'http://'.$_SERVER['HTTP_HOST'];
}
?>

<?php echo $title;?>

 
 页面加载中，请稍候...  

Step 2: Add rewrite rules

• Nginx：

  # External link redirect rewrite
  rewrite ^/go/(.*)$ /go.php?url=$1 last; #Check the actual path to go.php; the default is the website's root directory
  

• apache:

  RewriteRule ^go/(.*)$ /go.php?url=$1 [L]