callback function for curl_formget()
The void *arg pointer will be the one passed as second argument to
curl_formget().
The character buffer passed to it must not be freed.
Should return the buffer length passed to it as the argument "len" on
success.
callback function for curl_formget() The void *arg pointer will be the one passed as second argument to curl_formget(). The character buffer passed to it must not be freed. Should return the buffer length passed to it as the argument "len" on success.