diff --git a/api/auth/center_test.go b/api/auth/center_test.go
index 807bdd17..c4756466 100644
--- a/api/auth/center_test.go
+++ b/api/auth/center_test.go
@@ -139,6 +139,45 @@ Testing with the {sdk-java}
 	require.NoError(t, err)
 }
 
+func TestSignatureV4(t *testing.T) {
+	signer := v4.NewSigner(func(options *v4.SignerOptions) {
+		options.DisableURIPathEscaping = true
+		options.Logger = zaptest.NewLogger(t)
+		options.LogSigning = true
+	})
+
+	creds := aws.Credentials{
+		AccessKeyID:     "9CBEGH8T9XfLin2pg7LG8ZxBH1PnZc1yoioViKngrUnu0CbC2mcjpcw9t4Y7AS6zsF5cJGkDhXAx5hxFDKwfZzgj7",
+		SecretAccessKey: "8742218da7f905de24f633f44efe02f82c6d2a317ed6f99592627215d17816e3",
+	}
+
+	bodyStr := `tmp2
+`
+	body := bytes.NewBufferString(bodyStr)
+
+	req, err := http.NewRequest("PUT", "http://localhost:8084/main/tmp2", body)
+	require.NoError(t, err)
+	req.Header.Set("Authorization", "AWS4-HMAC-SHA256 Credential=9CBEGH8T9XfLin2pg7LG8ZxBH1PnZc1yoioViKngrUnu0CbC2mcjpcw9t4Y7AS6zsF5cJGkDhXAx5hxFDKwfZzgj7/20241210/ru/s3/aws4_request, SignedHeaders=content-md5;host;x-amz-content-sha256;x-amz-date, Signature=945664a5bccfd37a1167ca5e718e2b883f68a7ccf7f1044768e7fe58b737b7ed")
+	req.Header.Set("Content-Length", "5")
+	req.Header.Set("User-Agent", "aws-cli/2.13.2 Python/3.11.4 Linux/6.4.5-x64v1-xanmod1 exe/x86_64.debian.11 prompt/off command/s3api.put-object")
+	req.Header.Set("Content-MD5", "DstU4KxdzBj5jTGltfyqgA==")
+	req.Header.Set("Expect", "101-continue")
+	req.Header.Set("X-Amz-Content-Sha256", "1f9b7417ee5445c41dbe904c3651eb0ba1c12fecff16c1bccd8df3db6e390b5f")
+	req.Header.Set("X-Amz-Date", "20241210T114611Z")
+
+	service := "s3"
+	region := "ru"
+	signature := "945664a5bccfd37a1167ca5e718e2b883f68a7ccf7f1044768e7fe58b737b7ed"
+	signingTime, err := time.Parse("20060102T150405Z", "20241210T114611Z")
+	require.NoError(t, err)
+	cloned := cloneRequest(req, &AuthHeader{SignedFields: []string{"content-md5", "host", "x-amz-content-sha256", "x-amz-date"}})
+
+	err = signer.SignHTTP(cloned.Context(), creds, cloned, "1f9b7417ee5445c41dbe904c3651eb0ba1c12fecff16c1bccd8df3db6e390b5f", service, region, signingTime)
+	require.NoError(t, err)
+	signatureComputed := NewRegexpMatcher(AuthorizationFieldRegexp).GetSubmatches(cloned.Header.Get(AuthorizationHdr))["v4_signature"]
+	require.Equal(t, signature, signatureComputed, "signature mismatched")
+}
+
 func TestCheckFormatContentSHA256(t *testing.T) {
 	defaultErr := errors.GetAPIError(errors.ErrContentSHA256Mismatch)
 
diff --git a/api/auth/signer/v4sdk2/signer/v4/v4.go b/api/auth/signer/v4sdk2/signer/v4/v4.go
index 5ea9a185..7595e175 100644
--- a/api/auth/signer/v4sdk2/signer/v4/v4.go
+++ b/api/auth/signer/v4sdk2/signer/v4/v4.go
@@ -1,6 +1,7 @@
 // This is https://github.com/aws/aws-sdk-go-v2/blob/a2b751d1ba71f59175a41f9cae5f159f1044360f/aws/signer/v4/v4.go
 // with changes:
 //   * using different headers for sign/presign
+//   * don't duplicate content-length as signed header
 //   * use copy of smithy-go encoding/httpbinding package
 //   * use zap.Logger instead of smithy-go/logging
 
@@ -54,7 +55,6 @@ import (
 	"net/textproto"
 	"net/url"
 	"sort"
-	"strconv"
 	"strings"
 	"time"
 
@@ -440,20 +440,20 @@ func (s *httpSigner) buildCanonicalHeaders(host string, rule v4Internal.Rule, he
 	headers = append(headers, hostHeader)
 	signed[hostHeader] = append(signed[hostHeader], host)
 
-	const contentLengthHeader = "content-length"
-	if length > 0 {
-		headers = append(headers, contentLengthHeader)
-		signed[contentLengthHeader] = append(signed[contentLengthHeader], strconv.FormatInt(length, 10))
-	}
+	//const contentLengthHeader = "content-length"
+	//if length > 0 {
+	//	headers = append(headers, contentLengthHeader)
+	//	signed[contentLengthHeader] = append(signed[contentLengthHeader], strconv.FormatInt(length, 10))
+	//}
 
 	for k, v := range header {
 		if !rule.IsValid(k) {
 			continue // ignored header
 		}
-		if strings.EqualFold(k, contentLengthHeader) {
-			// prevent signing already handled content-length header.
-			continue
-		}
+		//if strings.EqualFold(k, contentLengthHeader) {
+		//	// prevent signing already handled content-length header.
+		//	continue
+		//}
 
 		lowerCaseKey := strings.ToLower(k)
 		if _, ok := signed[lowerCaseKey]; ok {
diff --git a/api/auth/signer/v4sdk2/signer/v4/v4_test.go b/api/auth/signer/v4sdk2/signer/v4/v4_test.go
index fb7b7d10..9065903a 100644
--- a/api/auth/signer/v4sdk2/signer/v4/v4_test.go
+++ b/api/auth/signer/v4sdk2/signer/v4/v4_test.go
@@ -1,4 +1,6 @@
 // This is https://github.com/aws/aws-sdk-go-v2/blob/a2b751d1ba71f59175a41f9cae5f159f1044360f/aws/signer/v4/v4_test.go
+// with changes:
+//   * don't duplicate content-length as signed header
 
 package v4
 
@@ -61,6 +63,7 @@ func buildRequestWithBodyReader(serviceName, region string, body io.Reader) (*ht
 
 func TestPresignRequest(t *testing.T) {
 	req, body := buildRequest("dynamodb", "us-east-1", "{}")
+	req.Header.Set("Content-Length", "2")
 
 	query := req.URL.Query()
 	query.Set("X-Amz-Expires", "300")
@@ -113,6 +116,7 @@ func TestPresignRequest(t *testing.T) {
 func TestPresignBodyWithArrayRequest(t *testing.T) {
 	req, body := buildRequest("dynamodb", "us-east-1", "{}")
 	req.URL.RawQuery = "Foo=z&Foo=o&Foo=m&Foo=a"
+	req.Header.Set("Content-Length", "2")
 
 	query := req.URL.Query()
 	query.Set("X-Amz-Expires", "300")
@@ -164,6 +168,7 @@ func TestPresignBodyWithArrayRequest(t *testing.T) {
 
 func TestSignRequest(t *testing.T) {
 	req, body := buildRequest("dynamodb", "us-east-1", "{}")
+	req.Header.Set("Content-Length", "2")
 	signer := NewSigner()
 	err := signer.SignHTTP(context.Background(), testCredentials, req, body, "dynamodb", "us-east-1", time.Unix(0, 0))
 	if err != nil {