@Override
    public void write(byte[] b, int off, int len) throws IOException {
        nonCopyingWrite(Arrays.copyOfRange(b, off, off + len));
    }
Buffered write of the contents of the array to this stream,
<i>copying</i> the contents of the given array to this stream.
It is in other words safe to recycle the array {@code b}.
container-core/src/main/java/com/yahoo/container/jdisc/ContentChannelOutputStream.java