hey, i try to to get a header that i set in nginx conf for the domain.
In my nginx conf

add_header X-Test-Header "test";

Now when I try to read this header in my NextJS application via middleware I get nothing back

import type { NextRequest } from 'next/server';

export function middleware(request: NextRequest) {
  const header = request.headers.get('X-Test-Header');

  console.log(header);
}

When I call the page with Postman I get to see this header