Resumes the download that has been paused.
-**Note:** To enable resumable downloads the server you are downloading from must support range requests and provide a `Last-Modified` and `ETag` header value. Otherwise `resume()` will dismiss previously received bytes and restart the download from the beginning.
+**Note:** To enable resumable downloads the server you are downloading from must support range requests and provide both `Last-Modified` and `ETag` header values. Otherwise `resume()` will dismiss previously received bytes and restart the download from the beginning.
#### `downloadItem.canResume()`