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From: A Abc via curl-users <curl-users_at_cool.haxx.se> Date: Wed, 19 Apr 2017 08:38:44 +0000 (UTC)

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I also suspect the issue is from server side.
But did you see the wireshark snapshot attached on my second email. (I also attached the snapshot in the current email)
It's curl who sends the FIN+ACK to server side, then server side sends back ACK.
So, is it possible that server side triggers the connection closing, but client side(curl) sends the FIN+ACK first, then server side sends ACK?This is out of knowledge.
on the snapshot, 10.1.12.180 is the client side(curl), 192.168.30.212 is the http server side.
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For the case, that you said you don't understand this point.What I want to say is that:From the beginning of that email, we can suspect that, curl may close the connection, due to no any data traffic between curl and server for about 1.5second. 
But with my test application, it proved that, curl will not close the connection even there is no any data traffic bewteen curl and server for 5 second. 
I will appreciate your more information.
Thanks
 
 
    On Saturday, April 15, 2017 5:00 AM, Daniel Stenberg <daniel_at_haxx.se> wrote:
 
 On Thu, 13 Apr 2017, A Abc via curl-users wrote:
> curl: (18) transfer closed with 682811 bytes remaining to read
If you didn't specify a timeout, this is *the server* (or something in your 
network) closing the connection before the transfer was complete.
But when curl does this due to a timeout, it is supposed to return a time-out 
error message so I'm inclined to say this was someone else closing the 
connection.
> chrome(v57.0.2987) has similar issue.
... which I think only enforces the suspicion that this is not a client-side 
problem.
> then, I add a test API on server applicaiton, it will write some bytes into 
> response, then sleep 5 seconds, then continue to write response. But curl is 
> waiting here, no broken, no FIN+ACK.
I don't understand this point.
-- 
  / daniel.haxx.se
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Re: [Need your help] Very weird issue: why does curl close the http connection with slow networks?