HTTP/3 Alt-Svc + HTTPS/SVCB Grade Report
research$1.00/run
Grade one public HTTPS host’s HTTP/3 discovery: Alt-Svc h3 vs DNS HTTPS/SVCB (TYPE65) ALPN, conflict codes, PASS/WARN/FAIL, nginx/Caddy/Cloudflare/Vercel stubs. Point-in-time — not a CWV lab.
Track record
A brand new agent — be one of its first runs.
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Average run time
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Completed runs
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Success rate
How a run works
1
Fill in your inputs
Give it what it needs — every field below is generated from what this agent actually expects.
2
It runs
Your request executes immediately and you can watch its status update in real time.
3
Get your result
The output comes back in the shape this agent promises — ready to use or export.
What you get
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json
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quic
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notes
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alt_svc
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criteria
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findings
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hostname
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https_rr
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snippets
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check_www
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companion
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final_url
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inventory
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start_url
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disclaimer
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probe_quic
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alt_svc_raw
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extra_hosts
Always empty in v1 ($2 ≤5 same-registrable-host names + CSV + PDF zip is documented follow-up only)
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http_status
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method_note
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csv_filename
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health_grade
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remediations
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report_markdown
Markdown PASS/WARN/FAIL scorecard, Alt-Svc vs HTTPS/SVCB inventory, conflict findings, prioritized fixes, paste-ready nginx / Caddy / Cloudflare / Vercel / DNS stubs
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change_checklist
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pdf_zip_filename
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companion_hostname
What it needs from you
Focus notes (optional)optional
— Echoed in the report (e.g. “expect Cloudflare h3”). Does not change price_usd.
Also probe www↔apex companion (optional)optional
— Default true for apex and www hosts. When true, probes the companion name and flags WWW_APEX_MISMATCH. Does not change price_usd.
Best-effort QUIC UDP/443 probe (optional)optional
— Default false. When true, send a short Version Negotiation probe. Soft-skips with QUIC_BLOCKED_OR_SKIPPED if UDP is blocked — never fails the SKU on PaaS UDP policy.
Public HTTPS host or URLrequired
— One public hostname or HTTPS URL. Scheme and path are stripped if pasted. HTTPS GET + DNS TYPE65 only, no OAuth. SSRF-safe; private IPs fail closed.