assertContentType("image/vnd.dxf", "extractor/dxf/autocad_R12_LT2.dxf", "autocad_R12_LT2.dxf");

        assertContentType("text/x-csrc", "extractor/program/test.c", "test.c");
        assertContentType("text/x-c++src", "extractor/program/test.cpp", "test.cpp");
        assertContentType("text/x-chdr", "extractor/program/test.h", "test.h");

    /** The URL of the API endpoint. */
    protected String url;

    /** The access timeout in seconds. */
    protected Integer accessTimeout; // sec

    /** The HTTP client used for API calls. */
    protected CloseableHttpClient httpClient;

    /** The connection timeout in milliseconds. */
    protected Integer connectionTimeout;

                    task.interrupt();
                    ThreadUtil.sleep(100L);
                }
                throw new ExtractException("PDFBox process cannot finish in " + timeout + " sec.");
            }
            if (!exceptionSet.isEmpty()) {
                throw exceptionSet.iterator().next();
            }
            writer.flush();