Update for anyone hitting this — GitHub Pages works as a proxy
where Vercel and shared cPanel hosting both fail. Created a simple
HTML page on GitHub Pages with:
- All OG meta tags pointing to my Promly content
- og:url set to the real domain (so FB card shows the right hostname label)
- JS redirect to the real site
- og:image hosted on GitHub Pages (FB fetches it without issue)
FB Debugger now returns 200 + full preview card. Users see “PROMLY.AI”
on the card thanks to og:url, but the actual scraped URL is a GitHub
Pages address that doesn’t hit Vercel’s edge filter.
Still waiting for proper Vercel-side fix, but this unblocks the launch.