아이프레임이나 프레임셋에서 컨텐츠를 불러오는거 거부해놓은 사이트인지 체크하는거.

After further research I found the answer on stackoverflow: Detect X-Frame-Options and Catching "Display forbidden by X-Frame-Options”.

PHP Script:

$error=false;
$urlhere=$_GET["url"];
$ch = curl_init();

$options = array(
    CURLOPT_URL            => $urlhere,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HEADER         => true,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_ENCODING       => "",
    CURLOPT_AUTOREFERER    => true,
    CURLOPT_CONNECTTIMEOUT => 120,
    CURLOPT_TIMEOUT        => 120,
    CURLOPT_MAXREDIRS      => 10,
);
curl_setopt_array($ch, $options);
$response = curl_exec($ch);
$httpCode = curl_getinfo($ch);
$headers=substr($response, 0, $httpCode['header_size']);
if(strpos($headers, 'X-Frame-Options: deny')>-1||strpos($headers, 'X-Frame-Options: SAMEORIGIN')>-1) {
    $error=true;
}
$httpcode= curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo json_encode(array('httpcode'=>$httpcode, 'error'=>$error));

AJAX Request:

$('a').click(function () {
    $.getJSON("source/script.php?url="+this, function (data) {
     if (data.error) { 
      $('iframe').hide();
      $(".iframe-error").show();
    } else { 
      $(".iframe-error").hide();
      $('iframe]').show();
    }
  });
  });

The code to display the iframe and the link to the new tab still needs to be further developed.