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   // foss.events (foss_events@fosstodon.org)'s status on Sunday, 12-Jan-2025 06:21:54 JST // foss.events

   As we are improving // foss.events today we wonder why #Mastodon shows a wrong #preview and how to fix it?

   It currently always shows "Everything in a nutshell about FOSS Hackathon 2025 on // foss.events" - which is the lates addition we have, although the event is for example about PyCamp España (see screenshots)

   Even though the event has specified otherwise in its #OpenGraph metadata?

   • Embed this notice
     Max Mehl (mxmehl@mastodon.social)'s status on Sunday, 12-Jan-2025 06:21:52 JST Max Mehl

     in reply to

     • Tino Eberl

     @tinoeberl @foss_events I think the same. The URL has to be the permalink of the URL you share. Probably, things are cached based on this URL.

     Source: "og:url - The canonical URL of your object that will be used as its permanent ID in the graph, e.g., "https://www.imdb.com/title/tt0117500/"."

     https://ogp.me/

   • Embed this notice
     // foss.events (foss_events@fosstodon.org)'s status on Sunday, 12-Jan-2025 06:21:53 JST // foss.events

     in reply to

     • Tino Eberl

     @tinoeberl but in this case it is not a repost of an event, but whenever we post a new event it always shows the wrong description

   • Embed this notice
     Tino Eberl (tinoeberl@mastodon.online)'s status on Sunday, 12-Jan-2025 06:21:53 JST Tino Eberl

     in reply to

     @foss_events

     Always the same URL?

   • Embed this notice
     Tino Eberl (tinoeberl@mastodon.online)'s status on Sunday, 12-Jan-2025 06:21:54 JST Tino Eberl

     in reply to

     @foss_events

     I think the data is cached in connection with the url. Same with my website. When I already posted a link to mastodon and mastodon created the preview, the preview is kept even if I change the picture.

   • Embed this notice
     Max Mehl (mxmehl@mastodon.social)'s status on Sunday, 12-Jan-2025 16:34:39 JST Max Mehl

     in reply to

     • Tino Eberl

     @foss_events @tinoeberl Well, it takes the link you share in your post. This does not necessarily have to be the permalink you provide in og:url, if you think about tracking links etc.

   • Embed this notice
     // foss.events (foss_events@fosstodon.org)'s status on Sunday, 12-Jan-2025 16:34:40 JST // foss.events

     in reply to

     • Tino Eberl
     • Max Mehl

     @mxmehl @tinoeberl we were wondering as well as it is even more weird:

     despite that the open graph meta data - as you see - provides the home page as URL, the preview correctly links to the event that it refers to?

     So maybe in the end it does not take the open graph information at all but uses the information from somewhere else?

   • Embed this notice
     // foss.events (foss_events@fosstodon.org)'s status on Sunday, 12-Jan-2025 18:32:51 JST // foss.events

     in reply to

     • Tino Eberl
     • Max Mehl

     @mxmehl @tinoeberl ok, we just adjusted as attached, let's wait for the next post and thank you very much for your help!

   • Embed this notice
     Max Mehl (mxmehl@mastodon.social)'s status on Sunday, 12-Jan-2025 18:32:51 JST Max Mehl

     in reply to

     • Tino Eberl

     @foss_events @tinoeberl Let's see ;) You could also adapt the og:title to the event title