private boolean containsNormal(String normalName, String value) {
        for (int i = 0; i < size(); i++) {
            if (name(i).equals(normalName) && value(i).equals(value)) {
                return true;
            }
        }
        return false;
    }
Returns if there is a header entry that matches the given name and value.
zuul-core/src/main/java/com/netflix/zuul/message/Headers.java