flexible/java-8/analytics/src/main/java/com/example/analytics/AnalyticsServlet.java [38:64]:
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  public void doGet(HttpServletRequest req, HttpServletResponse resp)
      throws IOException, ServletException {
    String trackingId = System.getenv("GA_TRACKING_ID");
    HttpClient client = HttpClientBuilder.create().build();
    URIBuilder builder = new URIBuilder();
    builder
        .setScheme("http")
        .setHost("www.google-analytics.com")
        .setPath("/collect")
        .addParameter("v", "1") // API Version.
        .addParameter("tid", trackingId) // Tracking ID / Property ID.
        // Anonymous Client Identifier. Ideally, this should be a UUID that
        // is associated with particular user, device, or browser instance.
        .addParameter("cid", "555")
        .addParameter("t", "event") // Event hit type.
        .addParameter("ec", "example") // Event category.
        .addParameter("ea", "test action"); // Event action.
    URI uri = null;
    try {
      uri = builder.build();
    } catch (URISyntaxException e) {
      throw new ServletException("Problem building URI", e);
    }
    HttpPost request = new HttpPost(uri);
    client.execute(request);
    resp.getWriter().println("Event tracked.");
  }
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flexible/java-11/analytics/src/main/java/com/example/analytics/AnalyticsServlet.java [38:64]:
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  public void doGet(HttpServletRequest req, HttpServletResponse resp)
      throws IOException, ServletException {
    String trackingId = System.getenv("GA_TRACKING_ID");
    HttpClient client = HttpClientBuilder.create().build();
    URIBuilder builder = new URIBuilder();
    builder
        .setScheme("http")
        .setHost("www.google-analytics.com")
        .setPath("/collect")
        .addParameter("v", "1") // API Version.
        .addParameter("tid", trackingId) // Tracking ID / Property ID.
        // Anonymous Client Identifier. Ideally, this should be a UUID that
        // is associated with particular user, device, or browser instance.
        .addParameter("cid", "555")
        .addParameter("t", "event") // Event hit type.
        .addParameter("ec", "example") // Event category.
        .addParameter("ea", "test action"); // Event action.
    URI uri = null;
    try {
      uri = builder.build();
    } catch (URISyntaxException e) {
      throw new ServletException("Problem building URI", e);
    }
    HttpPost request = new HttpPost(uri);
    client.execute(request);
    resp.getWriter().println("Event tracked.");
  }
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