h2o/h2o

H2O - the optimized HTTP/1, HTTP/2, HTTP/3 server observed · 2026-08-28

github.com/h2o/h2o · homepage · C · MIT (permissive) observed · 2026-08-28

Health v2 · maintenance only

75/100

Activity 96
Release rhythm 34
Longevity 100

How is this computed?

round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.

gap_med: n/a
age_days: 4400
days_rel: 226
days_push: 29
n_releases_24m: 1

Full methodology

Adoption not part of the score

11539 stars · 883 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

H2O is an optimized HTTP server written in C supporting HTTP/1.x, HTTP/2, and HTTP/3 (QUIC), with features like server push, 103 Early Hints, ACME certificate automation, and FastCGI/reverse proxying. It can also be embedded as a library (libh2o) and scripted with mruby.

Use cases

serve static files over http2 and http3
high performance web server with low latency
reverse proxy with http3 support
automate tls certificates with acme
embed an http server in a c application
scriptable web server with mruby rack apps

When to choose

you need top-tier HTTP/2 or HTTP/3 performance with low CPU and memory usage
you want modern protocol features like server push, Early Hints, and extensible priorities
you need a lightweight C-based server or embeddable HTTP library

When to avoid

you need a large ecosystem of third-party modules like nginx or Apache offer
you prefer configuration without building from source, since versioned releases have ceased
you need dynamic application hosting beyond FastCGI or mruby Rack

Facets

application · maturity active

http-server web-framework proxy security web-development backend performance networking cross-platform cli http2 http3 quic tls fastcgi reverse-proxy mruby libh2o high-performance linux macos web-server

4 sources

readme: https://github.com/h2o/h2o · fetched 2026-08-28 · e8dbebe9fb9c
homepage: https://h2o.examp1e.net · fetched 2026-08-29 · 568942aae71c
site_page: https://h2o.examp1e.net/install.html · fetched 2026-08-29 · df560f4b6741
site_page: https://h2o.examp1e.net/faq.html · fetched 2026-08-29 · 4899fe339d91

Member repositories

Repository	Role	Health v2
h2o/h2o	main	75

For agents

markdown · JSON · MCP: product_card(name="h2o/h2o")

Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem