Thank you guys. We figured out it's windows Azure issue. We encountered the
same issue when using javascripts to download. So it's not related to cURL
at all. Sorry about that and thank you for helping!

On Wed, Apr 12, 2017 at 1:54 AM, Alex Bligh via curl-users <
curl-users_at_cool.haxx.se> wrote:

>
> > On 11 Apr 2017, at 23:39, Kai Li <kli_at_alk.com> wrote:
> >
> > The ratio of reproducing this slowness is 1/10 roughly. I'm sure my
> network condition is very stable and fast.
>
> I'd run tcpdump on the connection and examine the difference between the
> slow transfers and the fast transfers.
>
> I would guess you either have packet loss, or (more likely given you think
> the network is OK) a subtle MTU issue between the two paths, possibly
> hidden by ICMP fragmentation needed packets normally, but filtered here,
> tickling the bug.
>
> --
> Alex Bligh
>
>
>
>
>
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Received on 2017-04-12