CURLOPT_HEADERDATA - pointer to pass to header callback
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADERDATA, void *pointer);
CURLOPT_HEADERDATA(3) curl_easy_setopt options CURLOPT_HEADERDATA(3) 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) or 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 ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | web/curl | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ SEE ALSO CURLOPT_HEADERFUNCTION(3), CURLOPT_WRITEFUNCTION(3), NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://curl.se/down- load/curl-7.83.1.tar.bz2. Further information about this software can be found on the open source community website at http://curl.haxx.se/. libcurl 7.83.1 November 26, 2021 CURLOPT_HEADERDATA(3)