private void writeCoreExtension(CoreExtension coreExtension, String tagName, XmlSerializer serializer)
            throws IOException {
        serializer.startTag(NAMESPACE, tagName);
        if (coreExtension.getGroupId() != null) {
            serializer
                    .startTag(NAMESPACE, "groupId")
                    .text(coreExtension.getGroupId())
                    .endTag(NAMESPACE, "groupId");
        }

         *
         * @return a list of page numbers within the page range
         */
        public List<Integer> createPageNumberList() {
            int startPage = currentPageNumber - pageRangeSize;
            if (startPage < 1) {
                startPage = 1;
            }
            int endPage = currentPageNumber + pageRangeSize;
            if (endPage > allPageCount) {
                endPage = allPageCount;

   * tests are divided into three sections:
   * 1. Tests on a hardcoded dataset for chains starting with median(), quartiles(), and scale(10);
   * 2. Tests on hardcoded datasets include non-finite values for chains starting with scale(10);
   * 3. Tests on a mechanically generated dataset for chains starting with percentiles();
   * 4. Tests of illegal usages of the API.
   */

  /*

   * tests are divided into three sections:
   * 1. Tests on a hardcoded dataset for chains starting with median(), quartiles(), and scale(10);
   * 2. Tests on hardcoded datasets include non-finite values for chains starting with scale(10);
   * 3. Tests on a mechanically generated dataset for chains starting with percentiles();
   * 4. Tests of illegal usages of the API.
   */

  /*

            }

            if (logger.isDebugEnabled()) {
                logger.debug("Starting job: id={}, scriptType={}, script={}", id, scriptType, script);
            } else if (scheduledJob.isLoggingEnabled() && logger.isInfoEnabled()) {
                logger.info("Starting job: id={}", id);
            }

            final Object ret = jobExecutor.execute(Constants.DEFAULT_SCRIPT, script);

        printStream.accept("Options:");
        printStream.accept("  -m, --model-version <version> Target POM model version (4.0.0 or 4.1.0)");
        printStream.accept("  -d, --directory <path> Directory to use as starting point for POM discovery");
        printStream.accept("  -i, --infer           Remove redundant information that can be inferred by Maven");

        if (eventType == XmlPullParser.TEXT) {
            eventType = parser.next();
        }
        if (eventType != XmlPullParser.START_TAG && eventType != XmlPullParser.END_TAG) {
            throw new XmlPullParserException(
                    "expected START_TAG or END_TAG not " + XmlPullParser.TYPES[eventType], parser, null);
        }
        return eventType;
    } // -- int nextTag( XmlPullParser )

These examples run the server program (e.g Uvicorn), starting **a single process**, listening on all the IPs (`0.0.0.0`) on a predefined port (e.g. `80`).

This is the basic idea. But you will probably want to take care of some additional things, like:

* Security - HTTPS
* Running on startup
* Restarts
* Replication (the number of processes running)
* Memory
* Previous steps before starting

     * @return The session ID of the crawling process.
     */
    public String execute() {
        if (logger.isInfoEnabled()) {
            logger.info("Starting crawler execution: sessionId={}, background={}, daemon={}", crawlerContext.sessionId, background, daemon);
        }
        parentThread = new Thread(this, "Crawler-" + crawlerContext.sessionId);

    @Override
    protected void startUp() {
      assertFalse(startUpCalled);
      assertFalse(runCalled);
      assertFalse(shutDownCalled);
      startUpCalled = true;
      assertEquals(State.STARTING, state());
    }

    @Override
    protected void run() {
      assertTrue(startUpCalled);
      assertFalse(runCalled);
      assertFalse(shutDownCalled);
      runCalled = true;