Eh adding websockets is a significant complexity jump, in my experience it's hard to write websocket client code which doesn't ever end up in a bad state despit

Eh adding websockets is a significant complexity jump, in my experience it's hard to write websocket client code which doesn't ever end up in a bad state despite connection breaks, and I still haven't figured out how to avoid random long delays in creating a websocket in my own projects. If you only need a completion callback and not continuous progress updates, long polling is an excellent solution which adds very little complexity compared to websockets.