php - Curl, follow location but only get header of the new location?

Question

I know that when I set CURLOPT_FOLLOWLOCATION to true, cURL will follow the Location header and redirect to new page. But is it possible only to get header of the new page without actually redirecting there? Or is it not possible?

Answer 1

Appears to be a duplicate of PHP cURL: Get target of redirect, without following it

However, this can be done in 3 easy steps:

Step 1. Initialise curl

curl_init($ch); //initialise the curl handle
//COOKIESESSION is optional, use if you want to keep cookies in memory
curl_setopt($ch, CURLOPT_COOKIESESSION, true);

Step 2. Get the headers for $url

curl_setopt($ch, CURLOPT_URL, $url); //specify your URL
curl_setopt($ch, CURLOPT_HEADER, true); //include headers in http data
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false); //don't follow redirects
$http_data = curl_exec($ch); //hit the $url
$curl_info = curl_getinfo($ch);
$headers = substr($http_data, 0, $curl_info["header_size"]); //split out header

Step 3. Parse the headers to get the new URL

preg_match("!
(?:Location|URI): *(.*?) *
!", $headers, $matches);
$url = $matches[1];

Once you have the new URL you can then repeat steps 2-3 as often as you like.