@Override
    @VisibleForTesting
    public boolean equals(Object other) {
        if (!(other instanceof Attrs)) {
            return false;
        }
        Attrs that = (Attrs) other;
        return Objects.equals(this.storage, that.storage);
    }
Returns the value in the attributes or {@code defaultValue} if absent.
@throws NullPointerException if defaultValue is null.
zuul-core/src/main/java/com/netflix/zuul/Attrs.java