better description for HEADERFUNCTION

.IP CURLOPT_HEADERFUNCTION

.IP CURLOPT_HEADERFUNCTION

Function pointer that should match the following prototype: \fIsize_t

Function pointer that should match the following prototype: \fIsize_t

function( void *ptr, size_t size, size_t nmemb, void *stream);\fP. This

function( void *ptr, size_t size, size_t nmemb, void *stream);\fP. This

function gets called by libcurl as soon as there is received header data that

function gets called by libcurl as soon as it has received header data. The

needs to be written down. The headers are guaranteed to be written one-by-one

header callback will be called once for each header and only complete header

and only complete lines are written. Parsing headers should be easy enough

lines are passed on to the callback. Parsing headers should be easy enough

using this. The size of the data pointed to by \fIptr\fP is \fIsize\fP

using this. The size of the data pointed to by \fIptr\fP is \fIsize\fP

multiplied with \fInmemb\fP.  The pointer named \fIstream\fP will be the one

multiplied with \fInmemb\fP. Do not assume that the header line is zero

you passed to libcurl with the \fICURLOPT_WRITEHEADER\fP option.  Return the

terminated! The pointer named \fIstream\fP is the one you set with the

number of bytes actually written or return -1 to signal error to the library

\fICURLOPT_WRITEHEADER\fP option. The callback function must return the number

of bytes actually taken care of, or return -1 to signal error to the library

(it will cause it to abort the transfer with a \fICURLE_WRITE_ERROR\fP return

(it will cause it to abort the transfer with a \fICURLE_WRITE_ERROR\fP return

code).

code).

LF) 3) a Trailer: header among the response-headers mention what header to

LF) 3) a Trailer: header among the response-headers mention what header to

expect in the trailer.

expect in the trailer.

.IP CURLOPT_WRITEHEADER

.IP CURLOPT_WRITEHEADER

Pass a pointer to be used to write the header part of the received data to. If

(This option is also known as \fBCURLOPT_HEADERDATA\fP) Pass a pointer to be

you don't use your own callback to take care of the writing, this must be a

used to write the header part of the received data to. If you don't use your

valid FILE *. See also the \fICURLOPT_HEADERFUNCTION\fP option above on how to

own callback to take care of the writing, this must be a valid FILE *. See

set a custom get-all-headers callback.

also the \fICURLOPT_HEADERFUNCTION\fP option above on how to set a custom

get-all-headers callback.

.IP CURLOPT_DEBUGFUNCTION

.IP CURLOPT_DEBUGFUNCTION

Function pointer that should match the following prototype: \fIint

Function pointer that should match the following prototype: \fIint

curl_debug_callback (CURL *, curl_infotype, char *, size_t, void *);\fP

curl_debug_callback (CURL *, curl_infotype, char *, size_t, void *);\fP