On Tue, 19 Feb 2008, Igor Bak wrote:

> There is an example for ftp resume file upload. I need smg like this
> functionality but for http post approach. I.e. I want to send at first only
> the specified header and after this depends on response transmit my file
> from specified position.

> Does somebody have an idea for this technique?

Sure! Assuming you use 7.18.0, here's one way to proceed:

1- use a read callback to provide the data for the POST

2- pause the upload on the first call to the callback unless you have received
    the header you need

3- once you get your needed header, unpause the upload and proceed to provide
    libcurl with the data you think should be sent off

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