This technique is called COMET. The very first web chat that I used way back in 1996 was COMET based, tho the term hadn’t been coined yet. It was the chat room on Sierra Online’s website. The app had two frames, one for the input field and another for the room feed, which was a long running connection. No JavaScript, just a never ending HTML page. I suspect the backend was written in Perl, as it was a cgi script.
Basically the server sends a multipart content type header, never sends a content size, and simply doesn’t terminate the connection, so the browser just waits patiently for more parts and renders them as they come. My team experimented with it a bit back in 2000 for doing what would eventually be termed JSONP Streaming. It was really cool tech, but we didn’t have a practical application for it.
Basically the server sends a multipart content type header, never sends a content size, and simply doesn’t terminate the connection, so the browser just waits patiently for more parts and renders them as they come. My team experimented with it a bit back in 2000 for doing what would eventually be termed JSONP Streaming. It was really cool tech, but we didn’t have a practical application for it.