On Fri, 19 Jul 2019, Taras Kushnir wrote:
I didn't investigate curl commandline tool upload time on my machine since
for me priority #1 is to fix upload errors of users of my app (since they
will just stop using it for upload). I will do so right after finding some
solution to this problem.
Trying the same operation with the curl tool would be a way to diagnose what
you're experiencing. If curl doesn't show the problem, then it is specific to
your use of libcurl. If curl *does* show it, then it seems likely to be a more
generic libcurl issue.
I understand about NAT/firewall/etc. timeout, but the thing is that libcurl
7.57 works for them right at the same time (of course, it could be a very
big coincidence).
I'm not suggesting it is a coincidence. You already say it uploads much
slower, so the risk for the control connection to time out is therefore much
higher so I think the correlation seems rather likely.
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