Possible to have dynamic social media cards? about spa-github-pages HOT 1 OPEN

Necro-post, but it has to do with how Github Pages serves 404.html. Since (to Github's servers) the client is requesting a non-existent page, Github's servers respond with a 404 response along with 404.html. This isn't a problem with browsers, but crawlers that social media sites use to search for OpenGraph tags give up when they reach the 404.

A solution I've seen posited is to use a meta refresh on 404.html to pray for it to substitute for a 301 or 302 status code. This didn't work for me (still haven't found a solution :<), but it might for any lurkers of this post.

Article that goes more in depth:
http://www.backalleycoder.com/2016/05/13/sghpa-the-single-page-app-hack-for-github-pages/

from spa-github-pages.