breautek commented on issue #328: URL: https://github.com/apache/cordova-plugin-file-transfer/issues/328#issuecomment-2086130915
Not all download requests signals the client how many bytes there are. Generally speaking the server must send a `Content-Length` response header for progress events to have a computable length. For large files, it's fairly common practice to use [Chunked Transfer Encoding](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Transfer-Encoding) instead in which case the response will not have a `Content-Length`. Services that uses Chunked Transfer Encoding generally use it because the service itself doesn't know how large the asset is. In the case of electron/browser platform, the underlying implementation is the browser XMLHttpRequest API itself, and `lengthComputable` may have other requirements for it to become true. The standard just specifies when it should be true, but doesn't necessary dictate how, and it might be up for interpretation. For iOS/Android platform, Cordova looks for the `Content-Length` response header. It's up to the application to check the `lengthComputable` field before attempting to calculate the transfer rate or progress. Because the data might not be provided by the server that you're making the download request from. I don't believe this is a bug but I won't close this issue just yet. If someone can demonstrate this issue occurring on android/ios on a download request in which provides a `Content-Length` response header, then I think this warrants investigating further. Otherwise I don't think this a bug. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@cordova.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@cordova.apache.org For additional commands, e-mail: issues-h...@cordova.apache.org
