HTTP/3 on Cloudflare

HTTP/3 is a Cloudflare zone-level setting, not SvelteKit application code.

Enable

1. Open the Cloudflare dashboard for the production zone.
2. Go to Speed > Optimization > Protocol Optimization.
3. Enable HTTP/3 (QUIC).

Verify

bun run verify:http3 -- https://spacebot.starspace.group
curl --http3 -I https://spacebot.starspace.group

The response should succeed and include an alt-svc header advertising h3.