Missing request body when handling a POST via superagent

Environment

Name	Version
msw	0.19.5
node	12.18.2
OS	Windows 10

Request handlers

    // just replicates the request data back to the client
    rest.post('http://mock.example.net:8080/foo', (req, res, ctx) => {
        return res(
            ctx.status(200),
            ctx.body(req.body),
        )
    })

Actual request

const superagent = require('superagent')

let response = await superagent.post('http://mock.example.net:8080/foo')
    .send({
        bar: 6,
        baz: '34',
    })

expect(response.body).toMatchObject({
    bar: 6,
    baz: '34',
})

Current behavior

Requests made via superagent are intercepted, but req.body at the respective response resolver always comes out as an empty string, regardless of the contents provided in the HTTP request. This was verified by peeking req in a debugger. Full Jest test below. The equivalent request using http.request directly does not reproduce the problem.

Expected behavior

I would have expected req.body to contain the request’s data in the HTTP message body (in the example, an object {bar: 6, baz: '34'}, although the behavior is not specific to this object nor to a JSON payload). The request itself is well formed and behaves well in other contexts (example programs to a non-mocked server appear to work fine).

Test

const superagent = require('superagent')
const { rest } = require('msw')
const { setupServer } = require('msw/node')

const MOCKED_URL = 'http://mock.example.net:8080/foo'
let server = setupServer(
    rest.post(MOCKED_URL, (req, res, ctx) => {
        return res(
            ctx.status(200),
            ctx.body(req.body),
        )
    }),
)

beforeAll(() => server.listen())
afterEach(() => server.resetHandlers())
afterAll(() => server.close())

test('send POST request with body via superagent', async () => {
    let response = await superagent.post(MOCKED_URL)
        .send({
            bar: 6,
            baz: '34',
        })

    expect(response.body).toMatchObject({
        bar: 6,
        baz: '34',
    })
})

[Enet4]

Thank you for the follow-up. One of the issues in the example above was that indeed I should not pass req.body to ctx.body if req.body isn’t a string. I probably tried ctx.body instead of ctx.json because the latter was not giving me any properties. Starting from 0.20.0, using ctx.json would work as expected.

I eventually stumbled upon another issue related with the use of cookies in environments without document (#312), but it has since been resolved and released in 0.20.2 (#313).

Consider this resolved. 👍

[kettanaito]

Could you please update to msw@0.20.x and let me know if the issue is still reproducible? If so, please share a reproduction scenario with us (in your fork, for example) so we could take a look. Thanks.