Uploads get aborted while in progress

[DenysVuika]

We experience a serious issue with the library (3.8.2) with regards to the Upload functionality.

For large files or slow networks the requests get aborted on the timeout while upload technically is in progress. This can be easy reproduced when with Chrome DevTools and network throttling, on "Slow 3G" the 40 mb file gets aborted at the beginning (I believe after 6-10 seconds).

Uploading the same file using vanilla JS and network settings works fine. Upload can keep up for half an hour or so.

I believe the issue might be related to how you handle the "responseTimeoutTimer" and the fact it is not reset for the "upload.onprogress" (https://github.com/visionmedia/superagent/blob/master/lib/client.js#L692)