Extension creates correct og:image but facebook takes another image (only on index)

[netgroupgmbh]

Hi there!

I installed the extension in Contao 4.4.55 (https://www.weiterbildungsinstitut.de), enabled social media images in the page layout (number of images: 1) and chose one image (for all pages) in the website root (https://www.weiterbildungsinstitut.de/files/wbi/bilder/social-media/wbi_lehrgaenge.jpg 1000 x 667px).

The extension now creates the right code on every page of the site:

<meta property="og:image" content="https://www.weiterbildungsinstitut.de/files/wbi/bilder/social-media/wbi_lehrgaenge.jpg">
<meta property="og:image:width" content="1000">
<meta property="og:image:height" content="667">

Facebook: if I want to post a link of one of the following pages the correct image is suggested. And if I post "https://www.weiterbildungsinstitut.de/index.html" it also works ...

Only if I want to post "https://www.weiterbildungsinstitut.de" - without "index.html" - another image is suggested (https://www.weiterbildungsinstitut.de/files/wbi/bilder/standorte/dortmund/standort_dortmund.jpg). WHY?

I more like the look of an index URL without "index.html" ...
Do you habe any tips or suggestions?

Thanks and best wishes ... Tanja

[fritzmg]

If the correct og:image is in the HTML source for a given URL, then the extension works correctly. The extension itself obviously has no influence on what Facebook actually uses.

In order to debug such things you need to use Facebook's Share Debugger. There you can also invalidate the image cache that Facebook uses for a given URL.

[qzminski]

@netgroupgmbh please follow the @fritzmg suggestion, I think it's related to the Facebook cache.

[netgroupgmbh]

Yes, regarding the HTML source code everything is fine ...
And indeed: it was the facebook cache! Using Facebook's Share Debugger helped a lot!

Thank you so much!