> H2O is an open source HTTP server supporting HTTP/2 and HTTP/3: what it does behind a website and what it means for cookies and GDPR consent. > > Canonical: https://www.flowconsent.com/en/services/hosting/h2o Hosting # H2O Unclassified · [Official website](https://github.com/h2o/h2o) H2O is an open source HTTP server written in C, designed for speed and supporting HTTP/1.1, HTTP/2 and HTTP/3. It can serve static files, act as a reverse proxy and run custom logic through mruby handlers. It works on the server side to deliver pages and does not add tracking scripts; any cookies come from the applications behind it. [Block H2O until consent](https://app.flowconsent.com/auth/sign-up?utm_source=flowconsent.com\&utm_medium=referral\&utm_campaign=hosting) · [Scan my site](https://www.flowconsent.com/en/scan) At a glance - Category [Hosting](https://www.flowconsent.com/en/services/hosting) - Consent Unclassified - Prior consent Required - Documented cookies 0 Compliance ## H2O and the GDPR H2O is classified as “Unclassified”. On a site that targets European visitors, it must only load after the visitor consents, and it must be listed in your cookie policy. Cookies and trackers ## What H2O sets and contacts The cookies of H2O are not documented in the catalog yet. To see what is actually set on your site, run a free scan. 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