CURLOPT_HEADERDATA - Online Linux Manual Page

Section : 3
Updated : November 26, 2021
Source : libcurl 7.82.0
Note : curl_easy_setopt options

NAME

CURLOPT_HEADERDATA − pointer to pass to header callback

SYNOPSIS

#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADERDATA, void *pointer);

DESCRIPTION

Pass a pointer

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

CURLOPT_WRITEFUNCTION(3)

CURLOPT_HEADERFUNCTION(3)

is used,

pointer

will be passed in to the respective callback. If neither of those options are set,

pointer

must be a valid FILE * and it will be used by a plain fwrite() to write headers to.

DEFAULT

NULL

PROTOCOLS

All

EXAMPLE

struct my_info { int shoesize; char *secret; }; static size_t header_callback(char *buffer, size_t size, size_t nitems, void *userdata) { struct my_info *i = (struct my_info *)userdata; /* now this callback can access the my_info struct */ return nitems * size; } CURL *curl = curl_easy_init(); if(curl) { struct my_info my = { 10, "the cookies are in the cupboard" }; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback); /* pass in custom data to the callback */ curl_easy_setopt(curl, CURLOPT_HEADERDATA, &my); curl_easy_perform(curl); }

AVAILABILITY

Always

RETURN VALUE

Returns CURLE_OK