Improvements to cache.nixos.org (help test the new config!)

[vcunat]

@thoughtpolice

But on top of that, Nix does not really do HTTP/2 multiplexing at all

I only had a vague memory of adding http/2 support, confirmed by a quick search: Enable HTTP/2 support · NixOS/nix@90ad02b · GitHub – in particular the commit message mentions not only connection reuse (which works with 1.1 as well) but parallelism as well.

I’d assume most of its advantage might be for the initial narinfo requests for clients that are further away, but it wouldn’t be good to spend much time optimizing just based on such simple guesses anyway.

@thoughtpolice

The vast majority of the latency from the cache until recently was not from any HTTP related shenanigans like multiplexing or pipelining […]

Thanks for the improvements and explanation.