update copy

example/object/copyPart.go

@@ -40,7 +40,7 @@ func initUpload(c *cos.Client, name string) *cos.InitiateMultipartUploadResult {
 }
 
 func main() {
-	u, _ := url.Parse("https://test-1253846586.cos.ap-guangzhou.myqcloud.com")
+	u, _ := url.Parse("https://test-1259654469.cos.ap-guangzhou.myqcloud.com")
 	b := &cos.BaseURL{BucketURL: u}
 	c := cos.NewClient(b, &http.Client{
 		Transport: &cos.AuthorizationTransport{

object.go

@@ -416,9 +416,9 @@ func (s *ObjectService) Copy(ctx context.Context, name, sourceURL string, opt *O
 	}
 	resp, err := s.client.doRetry(ctx, &sendOpt)
 	// If the error occurs during the copy operation, the error response is embedded in the 200 OK response. This means that a 200 OK response can contain either a success or an error.
-	if err == nil && resp.StatusCode == 200 {
-		if res.ETag == "" {
-			return &res, resp, errors.New("response 200 OK, but body contains an error")
+	if resp != nil && resp.StatusCode == 200 {
+		if err != nil {
+			return &res, resp, fmt.Errorf("response 200 OK, but body contains an error, RequestId: %v, Error: %v", resp.Header.Get("X-Cos-Request-Id"), err)
 		}
 	}
 	return &res, resp, err

object_part.go

@@ -280,9 +280,9 @@ func (s *ObjectService) CopyPart(ctx context.Context, name, uploadID string, par
 	}
 	resp, err := s.client.send(ctx, &sendOpt)
 	// If the error occurs during the copy operation, the error response is embedded in the 200 OK response. This means that a 200 OK response can contain either a success or an error.
-	if err == nil && resp != nil && resp.StatusCode == 200 {
-		if res.ETag == "" {
-			return &res, resp, errors.New("response 200 OK, but body contains an error")
+	if resp != nil && resp.StatusCode == 200 {
+		if err != nil {
+			return &res, resp, fmt.Errorf("response 200 OK, but body contains an error, RequestId: %v, Error: %v", resp.Header.Get("X-Cos-Request-Id"), err)
 		}
 	}
 	return &res, resp, err