Brotli, another one of those pseudostandards[1] from Big G that I was avoiding all along. Dodged another bullet.
[1] When more than half of the "standard" https://www.rfc-editor.org/info/rfc7932/#page-44 is an opaque binary blob, they're really not encouraging independent implementations.
Edit: the votes really show what an echochamber for Big G this place has become. FUCK YOU, GOOGLE!
How do you suggest they provide the static compression dictionary?
You don't. Any real compression algorithm, including all the other standard ones, doesn't need such a thing.
Many compression formats support static dictionaries, and for a good reason. Short messages don't compress well. If you know a bunch of common data for a context, you can make the first several kilobytes compress a lot better.