Use http status 202 for asynchronous operations

Question

I am writing a REST API for a service that will accept user contributed data. I would like to keep all operations completely asynchronous, this includes PUT, POST, DELETE an

Answer 1

FWIW, Microsoft Flow uses a pattern like this.
First call returns 202 w/ Location header. Followup calls return either: 1. If still processing --> 202 w/ a location header. The loc header can be different, which provides a way to pass state between calls (and potentially make the server stateless!). 2. If done --> 200.

Details at: https://github.com/jeffhollan/LogicAppsAsyncResponseSample