will be used. Set the string to NULL to disable kerberos4. The kerberos
support only works for FTP. (Added in libcurl 7.3)
.TP
-.B CURLOPT_WRITEINFO
-(NOT PRESENT IN 7.4 or later!)
-Pass a pointer to a zero terminated string as parameter. It will be used to
-report information after a successful request. This string may contain
-variables that will be substituted by their contents when output. Described
-elsewhere.
-.TP
.B CURLOPT_PROGRESSFUNCTION
Function pointer that should match the
.BI curl_progress_callback