this post was submitted on 29 Apr 2025
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You might be thinking of lzip rather than lz4. Both compress, but the former is meant for high compression whereas the latter is meant for speed. Neither are particularly good at dealing with highly redundant data though, if my testing is anything to go by.
Either way, none of those are installed as standard in my distro. xz (which is lzma based) is installed as standard but, like lzip, is slow, and zstd is still pretty new to some distros, so the recipient could conceivably not have that installed either.
bzip2 is ancient and almost always available at this point, which is why I figured it would be the best option to stand in for gzip.
As it turns out, the question was one of data streams not files, and as at least one other person pointed out, brotli is often available for streams where bzip2 isn't. That's also not installed by default as a command line tool, but it may well be that the recipient, while attempting to emulate a browser, might have actually installed it.
No. https://github.com/lz4/lz4
LZ4 already has a caddy layer which interprets and compresses data streams for caddy: https://github.com/mholt/caddy-l4
It's also very impressive.