H2O is a new generation HTTP server that provides quicker response to users with less CPU, memory bandwidth utilization when compared to older generation of web servers.
Designed from ground-up, the server implements of HTTP/2 and HTTP/3 taking the advantages of features including new and old content prioritization schemes, server push, 103 Early Hints, promising outstanding experience to the visitors of the web site.
This is free and open source software.
Features include:
- HTTP/1.0, HTTP/1.1.
- HTTP/2:
- full support for dependency and weight-based prioritization with server-side tweaks.
- cache-aware server push.
- HTTP/3:
- full support for Extensible Priorities (RFC 9218).
- fusion AES-GCM engine for fast QUIC packet generation.
- TCP:
- TCP Fast Open.
- low latency tweaks.
- TLS
- session resumption (standalone & memcached).
- session tickets with automatic key rollover.
- automatic OCSP stapling.
- forward secrecy.
- zerocopy and hardware crypto offloading.
- private key protection using privilege separation with support for Intel QuickAssist Technology.
- static file serving.
- FastCGI.
- reverse proxy.
- scriptable using mruby (Rack-based).
- graceful restart and self-upgrade.
- BPF-based tracing tool (experimental).
Website: h2o.examp1e.net
Support: GitHub Code Repository
Developer: DeNA Co., Ltd.
License: MIT License
H2O is written in C. Learn C with our recommended free books and free tutorials.
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