it isn't strictly necessary to use it after a perform

third argument \fBMUST\fP be a pointer to a long, a pointer to a char *, a

pointer to a struct curl_slist * or a pointer to a double (as this

documentation describes further down).  The data pointed-to will be filled in

accordingly and can be relied upon only if the function returns CURLE_OK.

This function is intended to get used AFTER a performed transfer, all results

from this function are undefined until the transfer is completed.

accordingly and can be relied upon only if the function returns CURLE_OK.  Use

this function AFTER a performed transfer if you want to get transfer- oriented

data.

You should not free the memory returned by this function unless it is

explictly mentioned below.