Link preview image is missing

[cluhmann]

I went to post a pymc.io link in discourse and noticed that the preview discourse generated was missing at least one image (possibly two). I know there are CSS things that you can add to get various social media sites to correctly preview links. I suspect that this may be related to that (not exactly sure what discourse is trying to pull here):

[OriolAbril]

I think the issue is that the extension we use to define these values removes the www part without which urls and links too images do not work. We currently add the extension in conf.py but don't add any configuration (it generally autoconfigures properly when using readthedocs). It looks like we need to configure it manually:

ogp_site_url = "https://www.pymc.io/"
ogp_image = "https://www.pymc.io/_static/PyMC.jpg"

Otherwise it uses https://pymc.io/_static/PyMC.jpg as the image link in the metadata

[OriolAbril]

same thing might happen for the other sites too, not sure. Can you try if that happens with example notebooks or api pages?

[cluhmann]

Images missing for both API and examples. Text description/preview was also missing from API link (the examples link did have a text preview, however).

[OriolAbril]

PR merged and website rebuilt. Can you check it works now? This can't really be tested reliably on the previews

[cluhmann]

Hm, that doesn't seem to have changed anything. Checking here, it looks like everything is detected ok and the only "complaint" is that that image aspect ratio is a bit wide. But I'm not sure what's up with discourse.

[OriolAbril]

Maybe there is some kind of caching issue? I really don't know what I'm doing 😅

[cluhmann]

I tried flushing and refreshing. Let me try logging out and back in?

[cluhmann]

Nope ☹️

[OriolAbril]

I do see the image, but not the favicon thingy. This might be related: https://meta.discourse.org/t/onebox-uses-wrong-url-for-the-favicon-in-link-preview/217074

[cluhmann]

That seems to be a problem with the favicon. We're missing the main preview image.