if errCode != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(errCode), r.URL)
		return
	}

	// Validate the query params before beginning to serve the request.
	if s3Error := validateListObjectsArgs(prefix, marker, delimiter, encodingType, maxkeys); s3Error != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL)
		return
	}

	if aec != ErrNone {
		return psv, aec
	}

	// Save signature.
	preSignV4Values.Signature, aec = parseSignature("Signature=" + query.Get(xhttp.AmzSignature))
	if aec != ErrNone {
		return psv, aec
	}

	// Return structured form of signature query string.
	return preSignV4Values, ErrNone
}

// Parses signature version '4' header of the following form.

	"net/url"
	"strconv"
)

// Parse bucket url queries
func getListObjectsV1Args(values url.Values) (prefix, marker, delimiter string, maxkeys int, encodingType string, errCode APIErrorCode) {
	errCode = ErrNone

	if values.Get("max-keys") != "" {
		var err error
		if maxkeys, err = strconv.Atoi(values.Get("max-keys")); err != nil {
			errCode = ErrInvalidMaxKeys
			return prefix, marker, delimiter, maxkeys, encodingType, errCode

		}
		if retentionPermErr != ErrNone {
			return mode, retainDate, legalHold, retentionPermErr
		}
		return rMode, rDate, legalHold, ErrNone
	}
	if replica { // replica inherits retention metadata only from source
		return "", objectlock.RetentionDate{}, legalHold, ErrNone
	}
	if !retentionRequested && retentionCfg.Validity > 0 {
		if retentionPermErr != ErrNone {

	inputHeader.Set("x-amz-date", expectedTime)
	// calling the function being tested.
	extractedSignedHeaders, errCode := extractSignedHeaders(signedHeaders, r)
	if errCode != ErrNone {
		t.Fatalf("Expected the APIErrorCode to be %d, but got %d", ErrNone, errCode)
	}

	inputQuery := r.URL.Query()
	// case where some headers need to get from request query
	signedHeaders = append(signedHeaders, "x-amz-server-side-encryption")

		{
			queryParams: map[string]string{
				"response-content-disposition": "attachment; filename=\"4K%2d4M.txt\"",
			},
			expected: ErrNone,
		},
		// (7) Should not error signature matches with no special query params.
		{
			queryParams: map[string]string{},
			expected:    ErrNone,
		},
	}

	// Run each test case individually.
	for i, testCase := range testCases {

		expectedCode       APIErrorCode
	}{
		// Test case - 1.
		{createExpectedRequest(&http.Request{}, "eu-central-1"), globalMinioDefaultRegion, ErrNone},
		// Test case - 2.
		// In case of empty request body ErrNone is returned.
		{createExpectedRequest(&http.Request{}, ""), globalMinioDefaultRegion, ErrNone},
		// Test case - 3
		// In case of garbage request body ErrMalformedXML is returned.
		{badRequest, globalMinioDefaultRegion, ErrMalformedXML},

	if s3Error := checkRequestAuthType(ctx, r, policy.ListBucketMultipartUploadsAction, bucket, ""); s3Error != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL)
		return
	}

	prefix, keyMarker, uploadIDMarker, delimiter, maxUploads, encodingType, errCode := getBucketMultipartResources(r.Form)
	if errCode != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(errCode), r.URL)
		return
	}

		// Get credential information from the request.
		cred, owner, s3Err = getReqAccessKeyV4(r, region, serviceS3)
		if s3Err != ErrNone {
			return cred, owner, s3Err
		}

		// we only support V4 (no presign) with auth body
		s3Err = isReqAuthenticated(ctx, r, region, serviceS3)
	}
	if s3Err != ErrNone {
		return cred, owner, s3Err
	}

	logger.GetReqInfo(ctx).Cred = cred
	logger.GetReqInfo(ctx).Owner = owner

	{err: crypto.ErrCustomerKeyMD5Mismatch, errCode: ErrSSECustomerKeyMD5Mismatch},
	{err: errObjectTampered, errCode: ErrObjectTampered},

	{err: nil, errCode: ErrNone},
	{err: errors.New("Custom error"), errCode: ErrInternalError}, // Case where err type is unknown.
}

func TestAPIErrCode(t *testing.T) {
	ctx := t.Context()
	for i, testCase := range toAPIErrorTests {