Detect HTTP/3
HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.
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Websites using HTTP/3
7,738 hostnames in the PluginView corpus for this technology.
| Hostname | Last seen |
|---|---|
| google.com | 8/6/2026 |
| youtube.com | 8/6/2026 |
| facebook.com | 8/6/2026 |
| amazon.com | 8/6/2026 |
| instagram.com | 8/6/2026 |
Whole list · $309.52 (7,738 × $0.04)
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known HTTP/3 signature at the time of the scan.
- Does not establish
- A sitewide install of HTTP/3, an active vendor contract, exclusive use, or that HTTP/3 is still in place today.
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How to check a site for HTTP/3
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest HTTP/3 signals.
- 2. PluginView reads only public responses and scores them against proprietary HTTP/3 fingerprints. Rule bodies and identifiers are not published.
- 3. Review the confidence score and text explanation for HTTP/3 on the results page.
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FAQ: detecting HTTP/3
- Can PluginView detect HTTP/3 without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for HTTP/3. It does not bypass authentication or paywalls.
- What category is HTTP/3?
- HTTP/3 is classified under Miscellaneous in the PluginView directory.
- Does PluginView publish HTTP/3 fingerprint rules?
- No. Detection uses proprietary fingerprint rules that are not published. Scan results explain matches in plain language without disclosing rule bodies or identifiers.
