Server-Sent Events Server

Easy to implement and extends SSE Server in PHP.

Links(from Wiki):

• https://www.w3.org/TR/eventsource/
• https://www.w3schools.com/html/html5_serversentevents.asp
• https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events
• https://dev.opera.com/blog/event-streaming-to-web-browsers/