reqV4Str := "V4 Signed HTTP request"

	type inputReqRec struct {
		req     *http.Request
		rec     *httptest.ResponseRecorder
		reqType string
	}

	for i, test := range testCases {
		// Using sub-tests introduced in Go 1.7.
		t.Run(fmt.Sprintf("MinIO-%s-Test-%d.", instanceType, i), func(t *testing.T) {
			// collection of input HTTP request, ResponseRecorder and request type.