@Override
    public Document unmarshall(byte[] input) throws Exception {
        try (InputStream is = new ByteArrayInputStream(input)) {
            return unmarshall(is);
        }
    }
@see io.apiman.gateway.engine.io.IPayloadIO#unmarshall(byte[])
gateway/engine/core/src/main/java/io/apiman/gateway/engine/io/XmlPayloadIO.java