private int findNormal(String normalName) {
        for (int i = 0; i < size(); i++) {
            if (name(i).equals(normalName)) {
                return i;
            }
        }
        return -1;
    }
Returns the first index entry that has a matching name.  Returns {@link #ABSENT} if absent.
zuul-core/src/main/java/com/netflix/zuul/message/Headers.java