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.

See also

• Fastly - The largest user of H2O in the world. Oku joined Fastly in .

References

External links