for i, testCase := range testCases {
		// obtain the put bucket policy request body.
		// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
		recV4 := httptest.NewRecorder()
		// construct HTTP request for PUT bucket policy endpoint.
		reqV4, err := newTestSignedRequestV4(http.MethodPut, getPutPolicyURL("", testCase.bucketName),

		t.Fatalf("Test %v: expected failure, but succeeded with %v", instanceType, rec.Code)
	}

	// Verify response of the V2 signed HTTP request.
	// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
	recV2 := httptest.NewRecorder()
	// construct HTTP request for DELETE bucket.

	rw := httptest.NewRecorder()
	trw := &trackingResponseWriter{ResponseWriter: rw}

	if headersAlreadyWritten(trw) {
		t.Fatal("headers have not been written yet")
	}

	trw.WriteHeader(123)
	if !headersAlreadyWritten(trw) {
		t.Fatal("headers were written")
	}
}

func TestHeadersAlreadyWrittenWrapped(t *testing.T) {
	rw := httptest.NewRecorder()

	if !globalBrowserEnabled {
		globalBrowserEnabled = true
		defer func() { globalBrowserEnabled = false }()
	}

	// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
	rec := httptest.NewRecorder()
	req, perr := newPostRequestV4("", bucketName, objectName, []byte("pwned"), credentials.AccessKey, credentials.SecretKey)
	if perr != nil {

			var reqV4, reqV2 *http.Request
			var recV4, recV2 *httptest.ResponseRecorder

			// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
			recV4 = httptest.NewRecorder()
			recV2 = httptest.NewRecorder()
			// setting a non-existent uploadID.
			// deliberately introducing the invalid value to be able to assert the response with the expected error response.

			objInfo:         objInfo,
			expectedFlag:    true,
			expectedCode:    304,
		},
	}
	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			recorder := httptest.NewRecorder()
			request := httptest.NewRequest(http.MethodHead, "/bucket/a", bytes.NewReader([]byte{}))
			request.Header.Set(xhttp.IfNoneMatch, tc.ifNoneMatch)
			request.Header.Set(xhttp.IfModifiedSince, tc.ifModifiedSince)

				"test1": {}, "test2": {}, "test3": {}, "test4": {},
			},
		},
	}

	for _, testCase := range testCases {
		t.Run(testCase.name, func(t *testing.T) {
			rec := httptest.NewRecorder()
			req := httptest.NewRequest("GET", "/test", nil)
			req.Header = testCase.headers

			opts, _ := getAndValidateAttributesOpts(ctx, rec, req, bucket, "testobject")

		}()
	}
	credentials := globalActiveCred

	req, err := getServiceCmdRequest(cmd, credentials)
	if err != nil {
		t.Fatalf("Failed to build service status request %v", err)
	}

	rec := httptest.NewRecorder()
	adminTestBed.router.ServeHTTP(rec, req)

	resp, _ := io.ReadAll(rec.Body)
	if rec.Code != http.StatusOK {
		t.Errorf("Expected to receive %d status code but received %d. Body (%s)",

		accessKey = userAccessKey
		secretKey = userSecretKey
	}

	req := buildKMSRequest(t, test.method, test.path, accessKey, secretKey, test.query)
	rec := httptest.NewRecorder()
	adminTestBed.router.ServeHTTP(rec, req)

	t.Logf("HTTP req: %s, resp code: %d, resp body: %s", req.URL.String(), rec.Code, rec.Body.String())

	// Check status code
	if rec.Code != test.wantStatusCode {

			sum := sha256.Sum256(body)
			req.Header.Set("X-Amz-Content-Sha256", hex.EncodeToString(sum[:]))
			req = signer.SignV4(*req, credentials.AccessKey, credentials.SecretKey, "", "us-east-1")

			rec := httptest.NewRecorder()
			api := objectAPIHandlers{
				ObjectAPI: func() ObjectLayer {
					return obj
				},
			}
			api.GetObjectLambdaHandler(rec, req)

			res := rec.Result()
			defer res.Body.Close()