public String getFirst(String name) {
        List<String> values = delegate.get(name);
        if (!values.isEmpty()) {
            return values.get(0);
        }
        return null;
    }
Get the first value found for this key even if there are multiple. If none, then
return null.
zuul-core/src/main/java/com/netflix/zuul/message/http/HttpQueryParams.java