This might be a transitional issue, but today I was trying to share a link to an Amazon item and the onebox preview gave me a sad face and reported a 503:
Sorry, we were unable to generate a preview for this web page, because the web server returned an error code of 503. Instead of a preview, only a link will appear in your post.
I tried a few Amazon links to the same effect.
Anyone have any clues as to what’s up with this? Is there a “right” way to share links to Amazon? I’m guessing it’s related to Amazon not liking the Discourse preview fetcher user-agent or something, but I don’t know how to internet so I really have no idea.