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.

[3] H2O has the following key features:[4] In July 2014, Kazuho Oku [ja] started development of H2O for usage as a server for mobile games while working at DeNA.

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