void addBytes(final byte[] bytes) {
            if (bytes == null) {
                return;
            }
            for (final byte b : bytes) {
                messageContents[currentOutputPosition] = b;
                currentOutputPosition++;
            }
        }
Adds the given bytes to the response.

@param bytes
           the bytes to add.
httpclient5/src/main/java/org/apache/hc/client5/http/impl/auth/NTLMEngineImpl.java