Tuesday, January 20, 2015

H2O version 0.9.1 released with support for HTTP2 dependency-based prioritization

Today I am pleased to announce the release of H2O version 0.9.1. The release tar-ball can be found in the releases section of the GitHub repository.

H2O is an optimized HTTP server with support for HTTP/1.x and the upcoming HTTP/2 protocol.

Version 0.9.1 contains many improvements that have gone into the source tree since the initial release, including contributions by people other than the original developers. I am very happy and thankful to those who have started sending pull-requests to H2O.

The full list of the changes can be found in the changelog. But on this blogpost I would like to concentrate on the issues regarding HTTP/2.

■Support for draft-16

H2O version 0.9.1 supports both draft-14 and draft-16. Draft-16 is the latest draft of HTTP/2, now at the final stage of becoming an RFC standard. Draft-14 is still supported for interoperability with older user-agents.

■Dependency-based prioritization

Dependency-based prioritization is one of the key functions of HTTP/2. It allows the web browsers to control the order in which the server sends the responses (e.g. send CSS files before HTML). Firefox/37 is going to start using the prioritization method, and we are happy to be able to support it. For more information about dependency-based prioritization and how it would be used, I would suggest reading Bits Up!: HTTP/2 Dependency Priorities in Firefox 37.

As Mozilla has enabled HTTP/2 by default in Firefox/35, it is now possible to take the benefit of using HTTP/2 to serve contents to the users faster than ever. I hope that H2O could be of some help in doing so.

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