passthrough

Use the req.passthrough method of the intercepted request to explicitly state that you wish for the library to bypass this request (perform as-is).

Since version 0.40.0, returning undefined/null from a response resolver will consider the intercepted request as unhandled.

1import { rest } from 'msw'
2
3export const handlers = [
4  rest.post('/user', (req, res, ctx) => {
5    // Perform the intercepted "POST /user" request as-is
6    // if its query string has the "id" parameter.
7    if (req.url.searchParams.has('id')) {
8      return req.passthrough()
9    }
10
11    // Otherwise, return a mocked "text/plain" response.
12    return res(ctx.text('hello'))
13  })
14]