in src/main/java/org/apache/sling/clam/http/internal/ClamEventsServlet.java [87:96]
protected void doGet(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
response.setCharacterEncoding(StandardCharsets.UTF_8.name());
response.setContentType("text/event-stream");
response.addHeader("Connection", "close");
final AsyncContext context = request.startAsync();
context.setTimeout(0);
final Client client = new Client(context);
context.getResponse().getOutputStream().setWriteListener(client);
clients.add(client);
}