What does "} [43028 bytes data]" mean in a curl upload?

I'm having some problems with curl (7.64.0 on Raspbian Buster) uploading small jpeg files via ftp to a web host. The curl command I am using is:

curl -v -n --max-time 120 -T "$file" $host >> $log 2>&1

This works just fine almost all of the time. However, the reason I have the --max-time option is because sometimes a transfer stalls and doesn't give up for about 17 minutes. Since I'm uploading a webcam image every four minutes, the timeout has to be rather short.

The verbose output from curl **always** has the following two lines:

< 150 Accepted data connection
} [43028 bytes data]

Where does that 43028 bytes come from? It is definitely not the length of the file, but it is often the point at which the transfer fails.

Here's what a successful transfer looks like:

> STOR chaamtest.jpg
< 150 Accepted data connection
} [43028 bytes data]
* We are completely uploaded and fine
* Remembering we are in dir "public_html/"
< 226-File successfully transferred
< 226 0.178 seconds (measured here), 0.59 Mbytes per second
100 107k 0 0 100 107k 0 99816 0:00:01 0:00:01 --:--:-- 99816

And here's what a failed transfer looks like (in part):

< 150 Accepted data connection
} [43028 bytes data]
 97 44251 0 0 97 43028 0 27232 0:00:01 0:00:01 --:--:-- 27250
 97 44251 0 0 97 43028 0 16664 0:00:02 0:00:02 --:--:-- 16664
 97 44251 0 0 97 43028 0 12002 0:00:03 0:00:03 --:--:-- 12005
 97 44251 0 0 97 43028 0 9380 0:00:04 0:00:04 --:--:-- 9380
<snip>
 97 44251 0 0 97 43028 0 43 0:17:09 0:16:30 0:00:39 0
 97 44251 0 0 97 43028 0 43 0:17:09 0:16:31 0:00:38 0
 * Send failure: Connection timed out
 97 44251 0 0 97 43028 0 43 0:17:09 0:16:32 0:00:37 0
* Closing connection 0
curl: (55) Send failure: Connection timed out

Any ideas?

-----------------------------------------------------------
Unsubscribe: https://cool.haxx.se/list/listinfo/curl-users
Etiquette: https://curl.haxx.se/mail/etiquette.html
Received on 2020-03-26