Hi all, is the option to add Custom App Headers available in v10? I found this https://github.com/umbraco/Umbraco-CMS/pull/9016 which gives me the impression that it is possible. I have tried to implement a test one but it didn't work and there are no official documentations about it - or am I missing something? Thanks in advance.

That PR never got merged - so I doubt it... I think the new backoffice has an extension point for that need though 🙂

yeah it does, but totally in different way

is there any way to achive it on umbraco v 13 ?

No, but you can in v14 🙂