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https://issues.apache.org/jira/browse/WICKET-6986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17544776#comment-17544776
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Tilman Müller commented on WICKET-6986:
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I found the root cause. One of the biggest changes in wicket 9 is de
introduction of the CPS en COOP header support. As you can see in my
testproject, the CPS blocking was already disabled. But the COOP header
"Cross-Origin-Opener-Policy: same-origin" did prevent Firefox from printing. By
setting this header to "same-origin-allow-popups" it works fine again with
wicket 9. I don't realy understand why this change helps, but it works ;).
Maybe somebody can explain it to me.
> Printing of PDF's does not work in Firefox
> ------------------------------------------
>
> Key: WICKET-6986
> URL: https://issues.apache.org/jira/browse/WICKET-6986
> Project: Wicket
> Issue Type: Bug
> Components: wicket-core
> Affects Versions: 9.10.0
> Environment: Windows 10/Alma Linux
> Reporter: Tilman Müller
> Priority: Critical
> Attachments: myproject-1.zip
>
>
> Since we are migrated from wicket 8.12.0 to wicket 9.9.0 we running into
> problems with printing PDF's in FireFox. We developed a small (PDFViewer)
> class above the WebMarkupContainer to view AND finaly print the PDF. Until
> wicket 8 this worked/works still fine in Firefox. However we now migrated to
> wicket 9.9.0 and viewing the PDF stil working in Firefox, but if you try to
> push the printing button within the default pdfviewer in Firefox nothing
> happend (except a (new) crash in the browser console). If you use the right
> mouse click menu and using "This Frame" -> "Print Frame" printing works fine.
> I added a quickstarter project with 1 extra class "PDFViewer", Test.pdf with
> only the word "Test" in it and a smal change in the default HomePage.html
> markup voor de PDF viewer. With this simple project you can easaly reproduce
> this behaviour. So I wondering if
> a) this is a bug sinds wicket 9 or
> b) the fault can be found in the PDFViewer class (also look at the override
> of the renderPage method - without this override we run into another strange
> crash).
> With kind regards.
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