But defining new
value for it like "Base64+gzip" is not beautiful because encoding and
compression are orthogonal concepts.
Not really, because regardless of what sort of thing (7bit, 8bit,
binary) you put into a compression algorithm, you'll get the same sort
of thing out (binary).
What would `Content-transfer-encoding: 7bit; compression=gzip' mean?
So, it makes sense to combine the two operations.
In practice, I imagine you'd define two new c-t-es: perhaps called
`lz77-base64', and `lz77'.
Tim.