Well, it is fully server-side.
The goal is to make a thing that tries its best to display those OpenGraph web previews in the best way possible but isn't tied to any specific client and instead links to them all in the resulting page.
Discussion
I’m working on exactly that, download OpenGraph data from a URL to generate link previews for my JSON clients. It’s about 90% done, it can download a HTML page and traverse the HTML to get the OG tags https://github.com/pedro-vicente/url_parse_open_graph