@Override
    public InputStream read(final Path file, final TransferStatus status, final ConnectionCallback callback) throws BackgroundException {
        try {
            if(file.getType().contains(Path.Type.upload)) {
                return new NullInputStream(0L);
            }
            if(status.isAppend()) {
                final HttpRange range = HttpRange.withStatus(status);
                return session.getClient().downloadFileRangeByIdToStream(
                    fileid.getVersionId(file),
                    range.getStart(), range.getEnd()
                );
            }
            final B2DownloadFileResponse response = session.getClient().downloadFileById(fileid.getVersionId(file));
            return new HttpMethodReleaseInputStream(response.getResponse(), status);
        }
        catch(B2ApiException e) {
            throw new B2ExceptionMappingService(fileid).map("Download {0} failed", e, file);
        }
        catch(IOException e) {
            throw new DefaultIOExceptionMappingService().map("Download {0} failed", e, file);
        }
    }
@Test
    public void testReadRangeUnknownLength() throws Exception {
        final Path bucket = new Path("test-cyberduck", EnumSet.of(Path.Type.directory, Path.Type.volume));
        final Path test = new Path(bucket, UUID.randomUUID().toString(), EnumSet.of(Path.Type.file));
        final B2VersionIdProvider fileid = new B2VersionIdProvider(session);
        new B2TouchFeature(session, fileid).touch(test, new TransferStatus());

        final Local local = new Local(System.getProperty("java.io.tmpdir"), UUID.randomUUID().toString());
        final byte[] content = RandomUtils.nextBytes(1000);
        final OutputStream out = local.getOutputStream(false);
        assertNotNull(out);
        IOUtils.write(content, out);
        out.close();
        new B2SingleUploadService(session, new B2WriteFeature(session, fileid)).upload(
                test, local, new BandwidthThrottle(BandwidthThrottle.UNLIMITED), new DisabledStreamListener(),
                new TransferStatus().withLength(content.length),
                new DisabledConnectionCallback());
        final TransferStatus status = new TransferStatus();
        status.setLength(-1L);
        status.setAppend(true);
        status.setOffset(100L);
        final InputStream in = new B2ReadFeature(session, fileid).read(test, status, new DisabledConnectionCallback());
        assertNotNull(in);
        final ByteArrayOutputStream buffer = new ByteArrayOutputStream(content.length - 100);
        new StreamCopier(status, status).transfer(in, buffer);
        final byte[] reference = new byte[content.length - 100];
        System.arraycopy(content, 100, reference, 0, content.length - 100);
        assertArrayEquals(reference, buffer.toByteArray());
        in.close();
        new B2DeleteFeature(session, fileid).delete(Collections.singletonList(test), new DisabledLoginCallback(), new Delete.DisabledCallback());
    }