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Clarify requirements for resumable downloads

rreimann 8 years ago
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      docs/api/download-item.md

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docs/api/download-item.md

@@ -100,6 +100,8 @@ Returns `Boolean` - Whether the download is paused.
 
 Resumes the download that has been paused.
 
+**Note:** To enable resumable downloads in the narrow sense the server you are downloading from must support range requests and provide a Last-Modified as well as an ETag header value. Otherwise `resume()` will dismiss previously received bytes and restart the download from the beginning. 
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 #### `downloadItem.canResume()`
 
 Resumes `Boolean` - Whether the download can resume.