getting an unhandled request error for requests that are handled but intended to be forwarded on

Describe the bug

When using server.listen({onUnhandledRequest: 'error'}), I expect to see errors when there’s an unhandled request, but not when the request is handled with a return undefined.

Environment

• msw: 0.27.1
• nodejs: 14
• npm: 6

Please also provide your browser version.

To Reproduce

Steps to reproduce the behavior:

1. Clone https://github.com/kentcdodds/msw-handler-error-bug
2. Install
3. Run node index.js
4. See error when mock = false but no error when mock = true

Expected behavior

There should be no error

Screenshots

[kentcdodds]

Ah, dang. I think this is above my level of experience 😬

[marcosvega91]

an idea could be to add a new method to response object like

const server = setupServer(
  rest.get('https://randomuser.me/api', (req, res, ctx) => {
    if (!mock) return res.forward()
    return res(ctx.json({mocked: true}))
  }),
)