return fmt.Sprintf("MinIO %s: %s fail for \"%s\": \n<Error> %s", instanceType, testType, testName, failMsg)
	}

	// httptest Recorder to capture all the response by the http handler.
	rec := httptest.NewRecorder()
	// reading the body to preserve it so that it can be used again for second attempt of sending unsigned HTTP request.
	// If the body is read in the handler the same request cannot be made use of.

			obj:         obj1,
			expRuleID:   0,
			transRuleID: 1,
		},
		{
			obj:         obj2,
			expRuleID:   0,
			transRuleID: 2,
		},
	}
	for i, tc := range tests {
		w := httptest.NewRecorder()
		lc.SetPredictionHeaders(w, tc.obj)
		if expHdrs, ok := w.Header()[xhttp.AmzExpiration]; ok && !strings.Contains(expHdrs[0], lc.Rules[tc.expRuleID].ID) {
			t.Fatalf("Test %d: Expected %s header", i+1, xhttp.AmzExpiration)