fix: merge request headers in middleware in app-router example

[sommeeeer]

When doing pnpm build && pnpm start in app-router. You will get an error when trying to run the e2e test locally for /methods/post/formdata:

⨯ TypeError: Content-Type was not one of "multipart/form-data" or "application/x-www-form-urlencoded".

The reason is this line:

opennextjs-aws/examples/app-router/middleware.ts

Line 31 in fbe09ae

const requestHeaders = new Headers();

I guess we need to pass in the request headers already coming in. Reason it works once deployed is because OpenNext doesn't remove them like next start.

I also removed an unused variable in /src/core/routing/middleware.ts

[changeset-bot]

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commit: 785ed05

[conico974]

Thanks