check_http3
shallowai.intodns/scanner · Verify this server
Read-only HTTP/3 + QUIC support check for a domain. Combines three signals: Alt-Svc HTTP response header advertising h3, HTTPS/SVCB DNS records advertising alpn="h3", and a live QUIC probe to UDP/443 verifying the handshake completes. Returns per-signal verdict plus an aggregate 'http3_ready' boolean. Use when validating CDN/Cloudflare HTTP/3 rollouts or auditing modern transport posture; not relevant for mail-only domains. No auth, ~2-5s due to UDP handshake timeout.
1 trials · measured 56 days ago
check_http3 scores 100.0/100 on Vouch's measured behaviour index, from 1 real invocation trials against ai.intodns/scanner, measured 25 Aug 2026 under methodology v0.2.0. Every measured component scored 100.
Component breakdown
| Component | Weight | Value |
|---|---|---|
| Reliability | 35% | not applicable |
| Schema integrity | 25% | 100.0 |
| Failure behaviour | 15% | not applicable |
| Latency | 15% | not applicable |
| Concurrency | 10% | not applicable |
Tool details
- Transport
- remote + stdio
- Credential class
- open
- Category
- Communication
- Input schema
- not declared
- Output schema
- not declared
- Side-effect classification
- unclassified
Score history
| Day | Score | Tier | Methodology |
|---|---|---|---|
| 2026-08-25 | 100.0 | shallow | v0.2.0 |
Probe evidence
| Probe | Outcomes |
|---|---|
| schema_integrity | pass: 1 |
Raw request/response logs are not archived yet — the outcome counts above are drawn directly from every recorded trial.
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