Detect HTTP/2
HTTP/2 (originally named HTTP/2.0) is a major revision of the HTTP network protocol used by the World Wide Web.
Detection looks at response headers across 2 fingerprint rules among the site's public responses.
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Websites using HTTP/2
Loading website list…
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Signal classes
PluginView evaluates public page signals in these classes when identifying HTTP/2. Individual fingerprint rule bodies are proprietary and are not published.
- Response headers
03
Example public indicators for HTTP/2
Illustrative indicators derived from public catalog metadata for HTTP/2. A live scan may match additional proprietary rules beyond these examples.
- alt-svc: h2
- x-firefox-spdy: h2
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known HTTP/2 signature (2 rules) at the time of the scan.
- Does not establish
- A sitewide install of HTTP/2, an active vendor contract, exclusive use, or that HTTP/2 is still in place today.
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How to check a site for HTTP/2
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest HTTP/2 signals.
- 2. PluginView reads only public responses (response headers) and scores them against the HTTP/2 signature set (2 rules).
- 3. Review the confidence score and text explanation for HTTP/2 on the results page.
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FAQ: detecting HTTP/2
- Can PluginView detect HTTP/2 without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for HTTP/2 — typically response headers. It does not bypass authentication or paywalls.
- What category is HTTP/2?
- HTTP/2 is classified under Miscellaneous in the PluginView directory.
- How many fingerprint rules cover HTTP/2?
- This reference currently tracks 2 fingerprint rules across response headers. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses HTTP/2?
- Illustrative public indicators for HTTP/2 include alt-svc: h2; x-firefox-spdy: h2. A live scan may match additional proprietary rules beyond these examples.
