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I have a site that currently have a some part of the headers like:

Vary: Accept-Encoding, Cookie

I want to modify it to be:

Vary: Accept-Language

I tried the suggestions here using this code

add_action( 'send_headers', 'mod_header_test' );
   function mod_header_test() {
   header( 'Vary: Accept-Language' );
}

But the results I'm getting is:

Vary: Accept-Encoding, Accept-Language, Cookie

How do I completely erase the existing Vary header using the correct action/filter and replace it with: Vary: Accept-Language ?

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