# H2O

Optimized HTTP/1.x, HTTP/2 and HTTP/3 web server written in C.

STUB. This software has no release or pre-release in four years, or its project site no longer shows it, so it is not part of the register, not counted and not indexed. It will be checked again.

Source: https://findsoftware.frbit.cloud/h2o/
Last reviewed: 2026-10-29
Listed since: 2026-10-29

## Record

### Links

- home: https://h2o.examp1e.net
- repository: https://github.com/h2o/h2o
- docs: https://h2o.examp1e.net/configure.html

### Identity

- status: stub
- maintainer: DeNA Co., Ltd.
- maintainerType: company
- parent: unknown
- firstRelease: 2015
- hqCountry: unknown

### Kind

- category: web-server
- hosting: binary
- language: c
- runtime: binary
- runtimeMin: unknown
- basedOn: unknown

### Content

- contentStore: not applicable
- databases: not applicable
- adminUi: not applicable
- headlessApi: not applicable
- templating: not applicable
- i18n: not applicable

### Rendering and deploy

- runsAs: always-on
- renderingModes: not applicable
- installMethod: build-from-source-cmake

### License

- licenseModel: open-source
- license: MIT

### Releases

- currentMajor: 2
- latestReleaseDate: 2019-08-13

### Adoption

- githubStargazers: 11559
- packagistDownloads: not applicable
- npmWeeklyDownloads: not applicable
- contributors: 140
- pluginCount: unknown
- packagistMonthlyDownloads: unknown
- ecosystemsMonthlyDownloads: unknown
- httpArchiveSites: unknown
- wordpressActiveInstalls: unknown
- dependentRepos: unknown
- dependentPackages: unknown

### Sources

- name: https://h2o.examp1e.net (read 2026-10-29)
- urls: https://h2o.examp1e.net (read 2026-10-29)
- urls: https://api.github.com/repos/h2o/h2o (read 2026-10-29)
- urls: https://h2o.examp1e.net/configure.html (read 2026-10-29)
- maintainer: https://raw.githubusercontent.com/h2o/h2o/master/LICENSE (read 2026-10-29)
- maintainerType: https://raw.githubusercontent.com/h2o/h2o/master/LICENSE (read 2026-10-29)
- category: https://h2o.examp1e.net (read 2026-10-29)
- language: https://api.github.com/repos/h2o/h2o (read 2026-10-29)
- runtime: https://h2o.examp1e.net/install.html (read 2026-10-29)
- installMethod: https://h2o.examp1e.net/install.html (read 2026-10-29)
- installMethod: https://h2o.examp1e.net/faq.html (read 2026-10-29)
- runsAs: https://h2o.examp1e.net/install.html (read 2026-10-29)
- license: https://raw.githubusercontent.com/h2o/h2o/master/LICENSE (read 2026-10-29)
- licenseModel: https://raw.githubusercontent.com/h2o/h2o/master/LICENSE (read 2026-10-29)
- firstRelease: https://api.github.com/repos/h2o/h2o/releases (read 2026-10-29)
- currentMajor: https://github.com/h2o/h2o/releases/tag/v2.2.6 (read 2026-10-29)
- latestReleaseDate: https://github.com/h2o/h2o/releases/tag/v2.2.6 (read 2026-10-29)
- githubStargazers: https://api.github.com/repos/h2o/h2o (read 2026-10-29)
- contributors: https://api.github.com/repos/h2o/h2o/contributors (read 2026-10-29)

## Notes

H2O is an HTTP server written in C that serves HTTP/1.x, HTTP/2 and HTTP/3. It is built from source with CMake, or as a library, and the [install guide](https://h2o.examp1e.net/install.html) says the server runs as a foreground process unless it is started with the -m option. Scripting with mruby is an optional build feature.

## Worth knowing

The install guide says the project has ceased to release versions, so a build comes from the master branch rather than from a tagged release. The record stays a stub until it is settled whether a project that ships from master counts as released.

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Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Attributes are recorded, never scored; absent means unknown.
Credit, in full: FindSoftware, CC BY 4.0