Can PluginView detect H2O without logging in?

Yes. PluginView only reads publicly accessible responses when checking for H2O. It does not bypass authentication or paywalls.

What category is H2O?

H2O is classified under Web servers in the PluginView directory.

Does PluginView publish H2O 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.

Detect H2O

Web servers

H2O is a fast and secure HTTP/2 server written in C by Kazuho Oku.

Websites using H2O

No websites in the corpus for this technology yet.

What a detection means

Establishes: One or more public signals on the scanned page matched a known H2O signature at the time of the scan.
Does not establish: A sitewide install of H2O, an active vendor contract, exclusive use, or that H2O is still in place today.

How to check a site for H2O

1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest H2O signals.
2. PluginView reads only public responses and scores them against proprietary H2O fingerprints. Rule bodies and identifiers are not published.
3. Review the confidence score and text explanation for H2O on the results page.

Commonly implies

A confirmed H2O match also implies these technologies are present.

C HTTP/2

FAQ: detecting H2O

Can PluginView detect H2O without logging in?: Yes. PluginView only reads publicly accessible responses when checking for H2O. It does not bypass authentication or paywalls.
What category is H2O?: H2O is classified under Web servers in the PluginView directory.
Does PluginView publish H2O 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.