}

        // Read partial content
        try (InputStream in = file.getInputStream()) {
            byte[] buffer = new byte[10];
            int bytesRead = in.read(buffer);
            assertEquals(10, bytesRead, "Should read requested bytes");
            assertEquals("0123456789", new String(buffer, 0, bytesRead, "UTF-8"));

            // Read next chunk
            bytesRead = in.read(buffer);

        /*
         * Note the Transport thread isn't running yet so we can
         * read from the socket here.
         */
        try {
            this.socket.setSoTimeout(this.transportContext.getConfig().getConnTimeout());
            if (peekKey() == null) { /* try to read header */
                throw new IOException("transport closed in negotiate");
            }
        } finally {

            final byte[] bomBytes = new byte[UTF8_BOM_SIZE];
            bis.mark(UTF8_BOM_SIZE);
            final int size = bis.read(bomBytes);
            if (size < 3 || !isUtf8BomBytes(bomBytes)) {
                bis.reset();
            }
            final InputSource is = new InputSource(bis);
            if (responseData.getCharSet() != null) {

        } else {
            // v1.0 endpoint for backward compatibility
            authUrl = getAuthority() + getTenant()
                    + "/oauth2/authorize?response_type=code&scope=directory.read.all&response_mode=form_post&redirect_uri="
                    + URLEncoder.encode(getReplyUrl(request), Constants.UTF_8_CHARSET) + "&client_id=" + getClientId()