Hi Martijn, Thank you very much for the reply. Appreciate it!
After your question I tried different browsers and got the hint in one iframe error message, that my server refused the connection. I searched the web and found out that it was the default value of the X-Frame-Option header defaulting to „deny“. That prevents loading content from the server into the iframe. I added the option on my haproxy frontend configuration with value: „sameorigin“ and the iframe is loading now. For part 2, I tried: MacOS Preview, Adobe DC Reader (Mac and Win), and PDF Reader from Apple App Store so far. All with the same results. Best regards, Sascha
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