x-middleware-rewrite header changes the protocol to https instead of http when using nginx http proxy

[mustbefail]

we are using nginx with http proxy pass
we decided to switch to next-intl but there is a problem
when we deploy nextjs + next-intl app on our server header x-middleware-rewrite changes protocol from http to https

nginx proxy https://travel.padi.inprogress.rocks/ to http://127.0.0.1:4300/

request url: https://travel.padi.inprogress.rocks/dive-trip/ukraine/multi-day-trip-65406/?activity_date=2025-03-01

x-middleware-rewrite: https://localhost:4300/dive-trip/ukraine/multi-day-trip-65406/?activity_date=2025-03-01

and we are getting certificate mismatch errors when running the nextjs server

without next-intl it works as expected but without intl router which we need

maybe some advice?

without next-intl it works as expected but without intl router which we need