fakeErr := errors.New("fake error")
	didClose := make(chan bool, 1)
	req, _ := NewRequest("POST", ts.URL, struct {
		io.Reader
		io.Closer
	}{
		io.MultiReader(io.LimitReader(neverEnding('x'), 1<<20), iotest.ErrReader(fakeErr)),
		closerFunc(func() error {
			select {
			case didClose <- true:
			default:
			}
			return nil
		}),
	})
	res, err := c.Do(req)
	if res != nil {