Fixes#33536
I was thinking to make `body` optional here instead:
2c6bd1ed1b/packages/next/shared/lib/utils.ts (L262)
But that might result in more errors when not setting the status code correctly. So it's the easiest for us to just recommend `.end()` which `.send()` uses when there is no argument.
c71465d87a/packages/next/server/api-utils.ts (L269)
## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`
## Feature
- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`
## Documentation / Examples
- [ ] Make sure the linting passes by running `yarn lint`
This ensures we handle 204 and 304 status codes correctly in API routes.
## Bug
- [x] Related issues linked using `fixes #number`
- [x] Integration tests added
- [x] Errors have helpful link attached, see `contributing.md`
Fixes: https://github.com/vercel/next.js/issues/28464
