A tiny proxy that brings GitHub link previews back to Slack, Discord, Teams, and Twitter.

GitHub serves rich Open Graph and Twitter Card meta tags on every page. Most chat apps, however, no longer unfurl github.com URLs — for some this is policy, for others it's a bug they never fixed. fixgithub.com fetches the GitHub page you point it at, extracts the og:* and twitter:* tags GitHub already produced, and re-emits them on a tiny HTML page that any unfurl bot will happily preview. Humans get redirected straight back to the real GitHub URL.

Inspired by statico/ycombinator1.com, which does the same thing for Hacker News.

Replace github.com with fixgithub.com in any URL:

https://github.com/foo/bar/issues/3   →   https://fixgithub.com/foo/bar/issues/3

For gists, use the gist. subdomain:

https://gist.github.com/user/sha   →   https://gist.fixgithub.com/user/sha

Paste the rewritten link into Slack/Discord/etc. The unfurl will show the GitHub title, description, and image. Clicking the link redirects to the real github.com page.

Append ?fixgithub_debug=1 to any URL to see the extracted meta tags as JSON. Only known unfurl bots reach the function (see vercel.json), so send a bot user-agent:

curl -A Slackbot 'https://fixgithub.com/torvalds/linux?fixgithub_debug=1'

Requests whose user-agent is not a known unfurl bot (Slackbot, Discordbot, Twitterbot, …) get a 302 to GitHub at the edge and never invoke the function. This keeps scanners and scrapers from burning function quota.

A single Vercel serverless function:

1. Receives the request and picks the upstream host (github.com or gist.github.com) based on the incoming subdomain.
2. Fetches the same path from GitHub with an 8-second timeout.
3. Streams the response, stopping at </head> or 64 KB — whichever comes first.
4. Sweeps the head for <title>, og:*, and twitter:* meta tags.
5. On repo root pages (/owner/repo), collapses GitHub's redundant GitHub - owner/repo: <description> title down to just owner/repo so unfurls don't show the same line twice. Other pages pass through verbatim.
6. Re-emits them on a minimal HTML page with a meta-refresh + JS redirect to the canonical GitHub URL.

Zero runtime dependencies. Vercel's edge cache handles repeats (s-maxage=3600, stale-while-revalidate=86400).

# Repo setup
git init
pnpm install
curl -o public/favicon.ico https://github.com/favicon.ico

# Vercel
vercel link                            # create new project: fixgithub-com
vercel --prod                          # first deploy
vercel domains add fixgithub.com
vercel domains add www.fixgithub.com
vercel domains add gist.fixgithub.com

# Cloudflare DNS — add three CNAMEs (DNS-only / gray cloud):
#   @     CNAME  cname.vercel-dns.com
#   www   CNAME  cname.vercel-dns.com
#   gist  CNAME  cname.vercel-dns.com

# Verify
curl -I  https://www.fixgithub.com/foo                       # → 301 to apex
curl -sL https://fixgithub.com/statico/ycombinator1.com | grep og:title
curl -sL https://gist.fixgithub.com/<user>/<sha>        | grep og:title

Unlicense — public domain.