How to set up a proxy in Next.js?

Question

proxy

Guys, welcome) tell me please what could be the problem in the work of the rewrites method? there is a config file in the project folder. The application itself runs inside a Docker container. If you directly access the request along the path nginx_storytale-app/api .... - you can get the data and draw it on the page. I tried to replace part of the path using rewrites - nothing picks up. what could be the problem with rewrites ? why the method from the documentation does not work? thanks in advance.