// Start 3 outstanding requests and wait for the server to get them.
	// Their responses will hang until we write to resch, though.
	donech := make(chan bool)
	doReq := func() {
		defer func() {
			select {
			case <-stop:
				return
			case donech <- t.Failed():
			}
		}()
		resp, err := c.Get(ts.URL)
		if err != nil {
			t.Error(err)
			return
		}