BKTCLT-18 fix + add idempotency support

go-client/pkg/bucketclient/bucketclient.go

@@ -55,6 +55,7 @@ func parseRequestOptions(opts ...any) (optionsSet, error) {
 func (client *BucketClient) Request(apiMethod string, httpMethod string, resource string,
 	opts ...any) ([]byte, error) {
 	var response *http.Response
+	var err error
 
 	options, err := parseRequestOptions(opts...)
 	if err == nil {
@@ -64,11 +65,15 @@ func (client *BucketClient) Request(apiMethod string, httpMethod string, resourc
 		if options.requestBody != nil {
 			requestBodyReader = bytes.NewReader(options.requestBody)
 		}
-		request, err := http.NewRequest(httpMethod, url, requestBodyReader)
+		var request *http.Request
+		request, err = http.NewRequest(httpMethod, url, requestBodyReader)
 		if err == nil {
 			if options.requestBodyContentType != "" {
 				request.Header.Add("Content-Type", string(options.requestBodyContentType))
 			}
+			if options.idempotent {
+				request.Header["Idempotency-Key"] = []string{}
+			}
 			response, err = http.DefaultClient.Do(request)
 		}
 	}
@@ -77,7 +82,9 @@ func (client *BucketClient) Request(apiMethod string, httpMethod string, resourc
 			apiMethod, httpMethod, client.Endpoint, resource, 0, "", err,
 		}
 	}
-	defer response.Body.Close()
+	if response.Body != nil {
+		defer response.Body.Close()
+	}
 
 	if response.StatusCode / 100 != 2 {
 		splitStatus := strings.Split(response.Status, " ")