H2O
Optimized HTTP/1.x, HTTP/2 and HTTP/3 web server written in C.
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 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.
Identity
Rendering and deploy
Releases
Adoption
Sources
- 2026-10-29: name, links, Categories
h2o.examp1e.net - 2026-10-29: links, Written in, GitHub stars
api.github.com/repos/h2o/h2o - 2026-10-29: links
h2o.examp1e.net/configure.html - 2026-10-29: Maintainer, Maintained by, License, License model
raw.githubusercontent.com/h2o/h2o/master/LICENSE - 2026-10-29: Runtime, Install with, Runs as
h2o.examp1e.net/install.html - 2026-10-29: Install with
h2o.examp1e.net/faq.html - 2026-10-29: First release
api.github.com/repos/h2o/h2o/releases - 2026-10-29: Current major version, Last release
github.com/h2o/h2o/releases/tag/v2.2.6 - 2026-10-29: Contributors
api.github.com/repos/h2o/h2o/contributors