Why is it wrong for swagger to build a path through a proxy?

Question

Nginx

There is an application on the nest with a swager. It's running on the cloud. It is accessed via ngix proxy
Example - domain/api/devices

location /api {
rewrite ^/api/(.*)$ /$1 break;
proxy_pass ip

Svager incorrectly builds the path - domain/devices, skips api, in theory it is clear why. How can it be solved?