Validate URL linkedin account

No, with an individual profile. If i put an unexisting url profile, it doesn’t send an error messages

• This reply was modified 2 years, 4 months ago by pasalomoco.
• This reply was modified 2 years, 4 months ago by pasalomoco.

I try with this code:

$username = "lucia-villatoro-lópez-1ba32618a";
    $profileurl = "https://www.linkedin.com/in/".$username;
  
    $fp = curl_init($profileurl);
    echo "FP --->";
    var_dump($fp);
    $response = curl_exec($fp);
    echo "<br>response--->";
    var_dump($response);
    
    $response_code = curl_getinfo($fp, CURLINFO_HTTP_CODE);
    echo "<br>response_code--->";
    var_dump($response_code);
    
    $validprofile = ($response_code == 200);
    echo "<br>validprofile--->";
    var_dump($validprofile);
    
    die();

But linkedin send this response : 999

Status code 999 – a non-standard code is returned by some sites (e.g. LinkedIn) which do not permit scanning.

https://hexometer.com/http-status-codes/#:~:text=Status%20code%20999%20%2D%20a%20non,which%20do%20not%20permit%20scanning.

What kind of code do should need ?
@missveronicatv