Initial release of H2O, and why HTTPD performance will matter in 2015

In plain words

H2O is a web server released as version 0.9.0 that prioritizes HTTP/2 performance. It is designed for developers and system administrators looking to optimize server response times. The software demonstrates high throughput capabilities, handling hundreds of thousands of requests per second on multi-core systems, making it relevant for infrastructure planning as HTTP/2 adoption grows.

written from the facts on this page · September 2026

From the sources

Nice work. Hope to see more improvements to H2O and the other projects as well. Meanwhile how hard would be for h2o to have a spdy3 compatibility mode to benefit from it right now ? I did some tests on a machine with 8 cores and it seems that it doesn't scale beyound 2 threads. On my test with ab on localhost it do not go beyound 260,000 requests by second when I increment the number of threads and it even goes bellow that mark. ab -n 500000 -c 1000 -k http://127.0.0.1:8020/ Server Software: h2o/0.9.1-alpha1 Server Hostname: 127.0.0.1 Server Port: 8020 Document Path: / Document Length: 180 bytes Concurrency Level: 1000 Time taken for tests: 2.122 seconds Complete requests: 500000 Failed…from blog.kazuhooku.com

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