try (InputStream is = getContentInputStream(out)) {
            return mimeTypeHelper.getContentType(is, filename);
        }
    }

    /**
     * Gets an input stream for the content in the deferred file output stream.
     *
     * @param out the deferred file output stream
     * @return the input stream for the content
     * @throws IOException if an I/O error occurs

        // request header
        for (final Header header : requestHeaderList) {
            httpGet.addHeader(header);
        }

        HttpEntity httpEntity = null;
        try {
            // get a content
            final HttpResponse response = executeHttpClient(httpGet);
            httpEntity = response.getEntity();

            final int httpStatusCode = response.getStatusLine().getStatusCode();

                    final List<String> strList = new ArrayList<>();
                    for (int i = 0; i < nodeList.size(); i++) {
                        final Node node = nodeList.get(i);
                        strList.add(node.getTextContent());
                    }
                    buf.append(getResultDataBody(entry.getKey(), strList));
                    break;
                case NODE:

                }
                return false;
            }
        }

        // check it in result
        final AccessResult<Long> accessResult = dataHelper.getAccessResultMap(urlQueue.getSessionId()).get(url);
        if (accessResult != null) {
            if (logger.isDebugEnabled()) {
                logger.debug("URL exists in a result: {}", url);
            }
            return false;
        }

   * Where there's a hierarchy in the types, list it via a parent
   * Highly specific magic matches get a high priority
   * General magic matches which could trigger a false-positive need
     a low one
   * The priority for containers normally need to be higher than for
     the things they contain, so they don't accidently get detected
     as what's in them
   * For logic too complex to be expressed in a magic match, do the best