// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
		recV2 := httptest.NewRecorder()
		// construct HTTP request for Head Object endpoint.
		reqV2, err := newTestSignedRequestV2(http.MethodHead, getHeadObjectURL("", testCase.bucketName, testCase.objectName),
			0, nil, testCase.accessKey, testCase.secretKey, nil)
		if err != nil {

)

func newTestSignedRequest(method, urlStr string, contentLength int64, body io.ReadSeeker, accessKey, secretKey string, signer signerType) (*http.Request, error) {
	if signer == signerV2 {
		return newTestSignedRequestV2(method, urlStr, contentLength, body, accessKey, secretKey, nil)
	}
	return newTestSignedRequestV4(method, urlStr, contentLength, body, accessKey, secretKey, nil)
}