cURL get url from redirect

In your particular case, the server is checking for certain user-agent strings.

When a server checks the user-agent string, it will only respond with a 302 redirect status code when the server sees a "valid" (according to the server) user-agent. Any "invalid" user-agents will not receive the 302 redirect status code response or Location: header.

In your particular case, when the server receives a request from an "invalid" user-agent it responds with a 200 OK status code with no text in the response body.

(Note: in the code below, the actual URLs provided have been replaced with examples.)

Let's say that http://www.example.com's server checks the User-Agent string and that http://www.example.com/product/123/ redirects to http://www.example.org/abc.

In PHP your solution would be:

<?php$url = 'http://www.example.com/product/123/';$ch = curl_init($url);curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);curl_setopt($ch, CURLOPT_HEADER, true);curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (X11; Linux x86_64; rv:21.0) Gecko/20100101 Firefox/21.0"); // Necessary. The server checks for a valid User-Agent.curl_exec($ch);$response = curl_exec($ch);preg_match_all('/^Location:(.*)$/mi', $response, $matches);curl_close($ch);echo !empty($matches[1]) ? trim($matches[1][0]) : 'No redirect found';

And, the output of this script would be: http://www.example.org/abc.

Try using this code:

function curl_last_url(/*resource*/ $ch, /*int*/ &$maxredirect = null) { $mr = $maxredirect === null ? 5 : intval($maxredirect);     curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);     if ($mr > 0) {         echo $mr;        echo $newurl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);         $rch = curl_copy_handle($ch);         curl_setopt($rch, CURLOPT_HEADER, true);         curl_setopt($rch, CURLOPT_NOBODY, true);         curl_setopt($rch, CURLOPT_FORBID_REUSE, false);         curl_setopt($rch, CURLOPT_RETURNTRANSFER, true);         do {             curl_setopt($rch, CURLOPT_URL, $newurl);             $header = curl_exec($rch);             if (curl_errno($rch)) {                 $code = 0;             } else {                 $code = curl_getinfo($rch, CURLINFO_HTTP_CODE);                 echo $code;                if ($code == 301 || $code == 302) {                     preg_match('/Location:(.*?)\n/', $header, $matches);                     $newurl = trim(array_pop($matches));                 } else {                     $code = 0;                 }             }         } while ($code && --$mr);         curl_close($rch);         if (!$mr) {             if ($maxredirect === null) {                 trigger_error('Too many redirects. When following redirects, libcurl hit the maximum amount.', E_USER_WARNING);             } else {                 $maxredirect = 0;             }             return false;         }         curl_setopt($ch, CURLOPT_URL, $newurl);     } return $newurl; 

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