I've used pretty much all of them and in most cases you're sending the request via some message queue (front-end -> async to back-end -> message queue -> async

I've used pretty much all of them and in most cases you're sending the request via some message queue (front-end -> async to back-end -> message queue -> async returns to back-end DB), which is managed on the backend. I'm scratching my head as to why relying on the browsers threading to do seems like it offers any advantages...