How to wait for file creation in skipper?

Question

Angular

I save the file with the help of angular by sending a request. On the server side I use skipper. The request returns data about the file and is immediately applied on the page. But, I think so, at the time of sending the response, the file does not have time to be saved and I get a 404 error when accessing the file.
Tell me, maybe there is a callback in the skipper to complete the file saving or some other way to wait for the file to be saved.