CURLOPT_HEADERDATA - Online Linux Manual PageSection : 3
Updated : November 26, 2021
Source : libcurl 7.82.0
Note : curl_easy_setopt options

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NAMECURLOPT_HEADERDATA − pointer to pass to header callback

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

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DESCRIPTIONPass 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.

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DEFAULTNULL

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PROTOCOLSAll

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EXAMPLEstruct 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); }

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AVAILABILITYAlways

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RETURN VALUEReturns CURLE_OK

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SEE ALSOCURLOPT_HEADERFUNCTION(3), CURLOPT_WRITEFUNCTION (3)," 0

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