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Advanced iframe debug console - l: local messages, r: remote messages
User agent: CCBot/2.0 (https://commoncrawl.org/faq/)

Headers of http://negotin.101.worldphotoslibrary.com/login.php:
HTTP/1.1 200 OK
Server: nginx
Date: Sat, 31 Jul 2021 13:20:35 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
X-Powered-By: PHP/7.4.21
Set-Cookie: PHPSESSID=6aa4f7fa20313aca9022ad1bc988f40c; path=/; SameSite=None
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Set-Cookie: PHPSESSID=6aa4f7fa20313aca9022ad1bc988f40c; expires=Sat, 31-Jul-2021 13:30:35 GMT; Max-Age=600
X-Loopia-Node: 172.22.223.47

The page does exist and no X-Frame-Options header was found. But there can still be a iframe blocker script on this page. Go here for a full check.