The trusted domains configuration option does not seem to work properly

[aubincleme]

Steps to reproduce : 

• Install the PDF viewer application 2.5.3 on XWiki 15.10.x,
• Add the following macro in one of the pages :

{{pdfviewer file="https://www.dfn.de/wp-content/uploads/2021/12/satzungdfn.pdf"/}}

• Go in the administration, add https://www.dfn.de/ to the list of trusted domains in the PDF Macro configuration (currently this config is not documented − see Document the external URL configuration for the PDF viewer #55, but are notes about it in External PDFs are not displayed #15).
• Save, clear your cache, clear your cookies
• Go back to the page where you added the PDF viewer macro
• Observe that the PDF doesn't load :

[trrenty]

Hello, @aubincleme . The list of trusted domains in the PDF Macro configuration refer to the viewer domains, which, in most cases, means the domain of the xwiki server.

After reviewing this issue and #57 (where you used a bad example taken from the documentation) I also got to realise how lacking the documentation of this app is.

Will close this issue as invalid and update the documentation as per #55