I have found the reason for this problem. It has turned out that we have to set CURLOPT_SEEKFUNCTION and CURLOPT_SEEKDATA in order to be able to resume transfers correctly.

I'd suggest adding information about this to description of CURLOPT_APPEND, CURLOPT_RESUME_FROM and CURLOPT_RESUME_FROM_LARGE. I didn't know about existence of options related to seek function, but after I found them I still assumed that they have defaults just like i.e. CURLOPT_READFUNCTION. I was wrong.

Regards
Marcin Adamski

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Received on 2011-11-10