Em PHP deve ser algo nesta linha:
// ...
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, '
https://myserver.internal.net:9443');
curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2);
curl_setopt($ch, CURLOPT_SSLCERT, 'client.crt');
curl_setopt($ch, CURLOPT_SSLKEY, 'client.key');
curl_setopt($ch, CURLOPT_CAINFO, 'ca.crt');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
// do something with the result...
// ...
?>