[NextJS 15] Absolute redirect from server action to different service on same domain

[Safturento]

Summary

I have an application that I am trying to upgrade to NextJS 15 but I am running into issues with external redirects in server actions. The application has a NextJS server and an api server that are behind an envoy service which routes certain routes to the correct service. This means that both of these services are on the same domain.

In NextJS 14 when we redirect to an absolute URL in a server action that should go to our backend api it correctly treats this as an external redirect and routes through envoy to the correct place.

In NextJS 15 these redirects are treated as relative and are sent to NextJS on a path that does not exist, leading to a 404. I believe this change is why the behavior is different in version 15, and I'm wondering if there's any way to explicitly disable streaming for these redirects and treat them as external despite being on the same domain.

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