@Override
    public void append(String string, String encoding) throws UnsupportedEncodingException {
        byte [] bytes = string.getBytes(encoding);
        append(bytes);
    }
@see io.apiman.gateway.engine.io.IApimanBuffer#append(java.lang.String, java.lang.String)
gateway/engine/core/src/main/java/io/apiman/gateway/engine/io/ByteBuffer.java