package server

import (
	"net/http"
	"strings"
)

//nolint:unused
func addVary(header http.Header, value string) {
	for _, line := range header.Values("Vary") {
		for _, existing := range strings.Split(line, ",") {
			if strings.EqualFold(strings.TrimSpace(existing), value) {
				return
			}
		}
	}
	header.Add("Vary", value)
}