H2O (web server)

is a free and open-source web server. It is written in C, and is distributed under the terms of the MIT License.

It was designed with a focus on supporting HTTP/2 and TLS, maximizing the use of new web technologies such as prioritization and server push. As a result it achieves significantly better performance than conventional web servers such as nginx.

Features has the following key features: HTTP/1.0 and HTTP/1.1 support HTTP/2 support Full support for dependency and weight-based prioritization with server-side tweaks Cache-aware server push HTTP/3 support (experimental) TCP Fast Open TLS support Session resumption (standalone and memcached) Session tickets with automatic key rollover Automatic OCSP stapling Forward secrecy and fast AEAD cipher suite Private key protection using privilege separation Encrypted Client Hello (experimental) Static file serving FastCGI support Reverse proxy Scripting using mruby (Rack-based) Graceful restart and self-upgrade

History In , started development of for usage as a server for mobile games while working at DeNA. The initial version was released in , and the first stable version was released in when the HTTP/2 specification was finalized.

H2O (web server)

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