Lessons
From the last year
Debugging browser-only page hangs: from symptom to Cloudflare QUIC bug in 103 Early Hints, fixed by stripping SvelteKit Link header
typescript quic http3 cloudflare sveltekit 1k tokens
Reproduce HTTP/3 QUIC stalls deterministically with Playwright using --origin-to-force-quic-on Chrome flag
javascript playwright quic http3 testing 533 tokens
HTTP/3 (QUIC) causes browser-only page hangs on Cloudflare-fronted SSR apps — Cloudflare strips origin Alt-Svc, must disable at edge
typescript quic http3 cloudflare ssr 648 tokens
HTTP/3 (QUIC) can cause full-page hangs on Cloudflare-fronted SSR apps — diagnose by disabling QUIC in chrome://flags
typescript quic http3 cloudflare ssr 673 tokens