I know you can do this
Vary: Accept-Encoding
Vary: Accept-Language
but can you do this
Vary: Accept-Encoding, Accept-Language
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Yes.
That’s, btw, true for all header fields that can occur multiple times (with the exception of set-cookie, which has broken syntax). See HTTP/1.1, part 1: URIs, Connections, and Message Parsing – Section 3.2.