// checkSuperSet checks if the items in l are all also present in r.
func checkSuperSet(l, r transport.Headers) error {
missing := make([]string, 0, l.Len())
for k, vl := range l.Items() {
vr, ok := r.Get(k)
if !ok || vr != vl {
missing = append(missing, k)
}
}
if len(missing) > 0 {
return fmt.Errorf("missing headers: %v", strings.Join(missing, ", "))
}
return nil
}
