Reset _nb_retries
if data has been received from the server
#1784
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In #1766, I have introduced a retry mechanism in the download process if a
ConnectionError
orReadTimeout
error happens. The mechanism is quite simple: retry up to 5 times, wait 1s in between.This PR modifies this mechanism to reset the number of retries each time new data is received from the server. This is because (IMO) we should not assume before-hand how many retries will be needed to download a huge file on a slow connection. The only thing we want to avoid is to end up in an infinite loop, which cannot be the case here. Worst case is we retry 5 times between each chunk of data (very unlikely 😄)
(Failing tests are unrelated. I'm trying to fix them separately)