Piwik overlay

[Twan Goosen]

Reported by Go:

Page Overlay function does not work for some cases.

Example: Use main website. Go to main menu Actions > Pages. Select one Page (eg /index) and click page overlay icon which appears when mouse- over. The right pane would be blank and left is loading forever. If you do this for CLARIN-D, it works, but VLO behaves strangely (not Overlay on the right). Maybe problems for other websites too, but I did not check all.

This seems to be either a bug or a configuration issue related to frames. Piwik creates the overlay by including the original page in a frame. For the ​example of the clarin.eu index page, I get the following errors in my console:

Invalid 'X-Frame-Options' header encountered when loading
'https://stats.clarin.eu/index.php?module=Overlay&action=startOverlaySession&idSite=18&period=month&date=today&segment=#http://clarin.eu/': '' is not a recognized directive. The header will be ignored.

Refused to display 'https://www.clarin.eu/' in a frame because it set
'X-Frame-Options' to 'sameorigin'.

GET https://www.clarin.eu/ net::ERR_BLOCKED_BY_RESPONSE

I did a quick search and the problem has been reported before (​once) but does not seem common so I think this is probably something that should be fixed in our configuration.