fixed b9b55309 from https://gitee.com/esterzhou/docs/pulls/22452

Update docs (22155)
Signed-off-by: Nester.zhou <ester.zhou@huawei.com>

en/application-dev/reference/apis/js-apis-request.md

@@ -286,6 +286,10 @@ on(type: 'progress', callback:(uploadedSize: number, totalSize: number) => vo
 
 Subscribes to upload progress events. This API uses a callback to return the result synchronously.
 
+> **NOTE**
+>
+> To maintain a balance between power consumption and performance, this API cannot be called when the application is running in the background.
+
 **Required permissions**: ohos.permission.INTERNET
 
 **System capability**: SystemCapability.MiscServices.Upload
@@ -863,6 +867,10 @@ on(type: 'progress', callback:(receivedSize: number, totalSize: number) => vo
 
 Subscribes to download progress events. This API uses a callback to return the result synchronously.
 
+> **NOTE**
+>
+> To maintain a balance between power consumption and performance, this API cannot be called when the application is running in the background.
+
 **Required permissions**: ohos.permission.INTERNET
 
 **System capability**: SystemCapability.MiscServices.Download