Address comments

Author: ke.like

client.go

@@ -101,7 +101,8 @@ type Client struct {
 	HTTPClient      *http.Client
 	Region          string
 	AuthVersion     AuthVersionType //  v1 or v4 signature,default is v1
-	accessKeyLock   sync.RWMutex
+
+	accessKeyLock sync.RWMutex
 }
 
 func convert(c *Client, projName string) *LogProject {

signature.go

@@ -134,7 +134,7 @@ func (s *SignerV1) Sign(method, uri string, headers map[string]string, body []by
 		return err
 	}
 	digest := base64.StdEncoding.EncodeToString(mac.Sum(nil))
-	auth := fmt.Sprintf("SLS %v:%v", s.accessKeyID, digest)
+	auth := fmt.Sprintf("SLS %s:%s", s.accessKeyID, digest)
 	headers[HTTPHeaderAuthorization] = auth
 	return nil
 }

signature_test.go

@@ -14,7 +14,8 @@ type SignerV1Suite struct {
 	AccessKeyID     string
 	AccessKeySecret string
 	Endpoint        string
-	signer          Signer
+
+	signer Signer
 }
 
 func (s *SignerV1Suite) SetupTest() {

signature_v4.go

@@ -63,13 +63,6 @@ func (s *SignerV4) Sign(method, uri string, headers map[string]string, body []by
 		return fmt.Errorf("can't find '%s' header", HTTPHeaderLogDate)
 	}
 	date := dateTime[:8]
-
-	// If content-type value is empty string, server will ignore it.
-	// So we add a default value here.
-	if contentType, ok := headers[HTTPHeaderContentType]; ok && len(contentType) == 0 {
-		headers[HTTPHeaderContentType] = "application/json"
-	}
-
 	// Host should not contain schema here.
 	if host, ok := headers[HTTPHeaderHost]; ok {
 		if strings.HasPrefix(host, "http://") {