diff --git a/client.go b/client.go
index 6c1d243c..c1adbe03 100644
--- a/client.go
+++ b/client.go
@@ -39,6 +39,7 @@ const DefaultLogUserAgent = "golang-sdk-v0.1.0"
 type AuthVersionType string
 
 const (
+	AuthV0 AuthVersionType = "v0"
 	// AuthV1 v1
 	AuthV1 AuthVersionType = "v1"
 	// AuthV4 v4
@@ -112,6 +113,7 @@ type Client struct {
 	// When conflict with sdk pre-defined headers, the value will
 	// be ignored
 	CommonHeaders map[string]string
+	KeyProvider   string
 }
 
 func convert(c *Client, projName string) *LogProject {
@@ -133,6 +135,7 @@ func convertLocked(c *Client, projName string) *LogProject {
 	p.AuthVersion = c.AuthVersion
 	p.Region = c.Region
 	p.CommonHeaders = c.CommonHeaders
+	p.KeyProvider = c.KeyProvider
 	if c.HTTPClient != nil {
 		p.httpClient = c.HTTPClient
 	}
diff --git a/client_request.go b/client_request.go
index d8064180..e4954557 100644
--- a/client_request.go
+++ b/client_request.go
@@ -77,10 +77,15 @@ func (c *Client) request(project, method, uri string, headers map[string]string,
 			return nil, fmt.Errorf("Can't find 'Content-Type' header")
 		}
 	}
+	if c.KeyProvider != "" && c.AuthVersion != AuthV4 {
+		headers["x-log-keyprovider"] = c.KeyProvider
+	}
 	var signer Signer
 	if authVersion == AuthV4 {
 		headers[HTTPHeaderLogDate] = dateTimeISO8601()
 		signer = NewSignerV4(accessKeyID, accessKeySecret, region)
+	} else if authVersion == AuthV0 {
+		signer = NewSignerV0()
 	} else {
 		headers[HTTPHeaderDate] = nowRFC1123()
 		signer = NewSignerV1(accessKeyID, accessKeySecret)
@@ -89,11 +94,7 @@ func (c *Client) request(project, method, uri string, headers map[string]string,
 		return nil, err
 	}
 
-	for k, v := range c.CommonHeaders {
-		if _, ok := headers[k]; !ok {
-			headers[k] = v
-		}
-	}
+	addHeadersAfterSign(c.CommonHeaders, headers)
 	// Initialize http request
 	reader := bytes.NewReader(body)
 	var urlStr string
diff --git a/log_project.go b/log_project.go
index f5c4082b..8a1a7b6b 100644
--- a/log_project.go
+++ b/log_project.go
@@ -61,7 +61,8 @@ type LogProject struct {
 	//
 	// When conflict with sdk pre-defined headers, the value will
 	// be ignored
-	CommonHeaders      map[string]string
+	CommonHeaders map[string]string
+	KeyProvider   string
 }
 
 // NewLogProject creates a new SLS project.
diff --git a/request.go b/request.go
index 30cac2fe..61be2192 100644
--- a/request.go
+++ b/request.go
@@ -178,10 +178,15 @@ func realRequest(ctx context.Context, project *LogProject, method, uri string, h
 		}
 	}
 
+	if project.KeyProvider != "" && project.AuthVersion != AuthV4 {
+		headers["x-log-keyprovider"] = project.KeyProvider
+	}
 	var signer Signer
 	if project.AuthVersion == AuthV4 {
 		headers[HTTPHeaderLogDate] = dateTimeISO8601()
 		signer = NewSignerV4(accessKeyID, accessKeySecret, project.Region)
+	} else if project.AuthVersion == AuthV0 {
+		signer = NewSignerV0()
 	} else {
 		headers[HTTPHeaderDate] = nowRFC1123()
 		signer = NewSignerV1(accessKeyID, accessKeySecret)
@@ -190,11 +195,7 @@ func realRequest(ctx context.Context, project *LogProject, method, uri string, h
 		return nil, err
 	}
 
-	for k, v := range project.CommonHeaders {
-		if _, ok := headers[k]; !ok {
-			headers[k] = v
-		}
-	}
+	addHeadersAfterSign(project.CommonHeaders, headers)
 
 	// Initialize http request
 	reader := bytes.NewReader(body)
diff --git a/signature.go b/signature.go
index 4ec3a3c6..7e8d8aab 100644
--- a/signature.go
+++ b/signature.go
@@ -42,6 +42,16 @@ var gmtLoc = time.FixedZone("GMT", 0)
 func nowRFC1123() string {
 	return time.Now().In(gmtLoc).Format(time.RFC1123)
 }
+func NewSignerV0() *SignerV0 {
+	return &SignerV0{}
+}
+
+type SignerV0 struct{}
+
+func (s *SignerV0) Sign(method, uriWithQuery string, headers map[string]string, body []byte) error {
+	// do nothing
+	return nil
+}
 
 // SignerV1 version v1
 type SignerV1 struct {
@@ -138,3 +148,13 @@ func (s *SignerV1) Sign(method, uri string, headers map[string]string, body []by
 	headers[HTTPHeaderAuthorization] = auth
 	return nil
 }
+
+// add commonHeaders to headers after signature if not conflict
+func addHeadersAfterSign(commonHeaders, headers map[string]string) {
+	for k, v := range commonHeaders {
+		lowerKey := strings.ToLower(k)
+		if _, ok := headers[lowerKey]; !ok {
+			headers[k] = v
+		}
+	}
+}