SSE event receiver
(output1: no output received from HTTP server , are you using it ?)
(output2: no output received from HTTP server , are you using it ?)
HTTP server (multi-threaded or not, please note)
first launch the *PHP-enabled* HTTP-server this way or similar:
php -S localhost:8080 -t ~/code/000-categories/ht-web/ajax/sse
http://localhost:8080/event-receiver.html