fix: edge rendering failing due to undefined req.originalRequest

[james-elicx]

Fixing a bug

• Related issues linked using fixes #number
• Tests added. See: https://github.com/vercel/next.js/blob/canary/contributing/core/testing.md#writing-tests-for-nextjs
• Errors have a helpful link attached, see https://github.com/vercel/next.js/blob/canary/contributing.md

What?

#57815 introduced a bug where edge rendering fails due to the assumption that req is only of top NodeNextRequest and cannot be WebNextRequest, and therefore assumes that req.originalRequest is defined. In other parts of this file, it correctly falls back to using req when there is no originalRequest property defined on the object. Not falling back results in trying to access a property on undefined; req.originalRequest.socket, which throws an error and causes rendering to fail when deploying to Cloudflare Pages.

next.js/packages/next/src/server/base-server.ts

Lines 916 to 917 in 1ee50b8

	const { originalRequest } = req as NodeNextRequest
	req.headers['x-forwarded-proto'] ??= (originalRequest.socket as TLSSocket)

Here is an example of how this is treated elsewhere in this file, and how it should be treated where this bug occurs. Note how it falls back to using req as WebNextRequest.

next.js/packages/next/src/server/base-server.ts

Lines 2314 to 2319 in 1ee50b8

	result = await routeModule.render(
	(req as NodeNextRequest).originalRequest ?? (req as WebNextRequest),
	(res as NodeNextResponse).originalResponse ??
	(res as WebNextResponse),
	{ page: pathname, params: opts.params, query, renderOpts }
	)

We have had to manually add this patch to @cloudflare/next-on-pages for deployments on Cloudflare Pages to continue working (cloudflare/next-on-pages#534).

I tried to add tests but was unable to actually run any of the test suites on my MacBook or Desktop (WSL), so was unable to do so. This fix is pretty straightforward though and is just doing what is done elsewhere in this file, so hopefully that won't be a blocker.

Why?

How?

Closes NEXT-
Fixes #58265