}
	u, err := url.Parse(urlStr)
	if err != nil {
		return nil, fmt.Errorf("`%s` invalid: %s", urlStr, err.Error())
	}
	return u, nil
}

// TestCheckURL tests valid url.
func TestCheckURL(t *testing.T) {
	testCases := []struct {
		urlStr     string
		shouldPass bool
	}{
		{"", false},
		{":", false},
		{"http://localhost/", true},
		{"http://127.0.0.1/", true},