Refresh opengraph - cache when post with url is posted

[Faldrian]

Situation:

• I submit a post with a opengraph-enabled website
• diaspora requests opengraph-data and adds it to cache
• When I submit a post later containing the same url, the cache is not updated from the website. Old information is shown that may be not on the website anymore and as user I'm confused where that description text is coming from.

Recently I ran into this issue when I linked to the TheRadio.CC Website. We changed a page on there and the cached version contains a preview to some hint we no longer have on the site.

The fix would be: Refresh the cache every time a post with that url is submitted, regardless of the cache state.

[goobertron]

It sounds as though each post should display a cached version from the time at which that post was made. The person who made the previous post with a link to that page intended to link to the page as it existed when they made the link, and updating the OG preview on their post could change the meaning of their post, or make it meaningless. So simply updating the cache on the server might not be the answer.

[Faldrian]

I already thought this concern might come up. Yes, there should be one opengraph-cache-data-thing per post to be perfectly correct.