Advanced iframe debug console – l: local messages, r: remote messages

User agent: WP Fastest Cache Preload Bot

Headers of https://www.civis-media.de/search/public/index.html:
HTTP/2 200
server: nginx
date: Thu, 07 Sep 2023 08:29:53 GMT
content-type: text/html
content-length: 10511
last-modified: Thu, 11 May 2023 16:53:35 GMT
vary: Accept-Encoding
etag: „645d1d8f-290f“
strict-transport-security: max-age=15768000; includeSubDomains
x-powered-by: PleskLin
accept-ranges: bytes

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.