> You’ve never used a web-app chat client? A decade ago people use comet for this, with php and apache! Every single ongoing comet connection occupy an apache

> You’ve never used a web-app chat client? A decade ago people use comet for this, with php and apache! Every single ongoing comet connection occupy an apache process, a significant resource hog, yet people still use it because they have no other choice. These days we have websocket but I bet comet can be implemented with minimal resource penalty these days thanks to proliferation of async webserver support in modern backend stacks.