How do the HTTP header options Accept-Encoding - content compression work?

Question

Data compression

I understand correctly that if you write like this, then the content will be transferred in 3 archives Accept-Encoding: gzip, compress, br?
This example is taken from the Mozilla website:
https://developer.mozilla.org/uk/docs/Web/HTTP/%D0...

Answer 1

I understand correctly that if you write like this, then the content will be transferred in 3 archives Accept-Encoding: gzip, compress, br?

no.
the content will either not be compressed at all, or will be compressed by one of these algorithms at the discretion of the server.