curl/docs/libcurl/opts/CURLOPT_HSTSREADDATA.md

---

c: Copyright (C) Daniel Stenberg, daniel@haxx.se, et al. SPDX-License-Identifier: curl Title: CURLOPT_HSTSREADDATA Section: 3 Source: libcurl Protocol:

• HTTP See-also:
• CURLOPT_HSTS (3)
• CURLOPT_HSTSREADFUNCTION (3)
• CURLOPT_HSTSWRITEDATA (3)
• CURLOPT_HSTSWRITEFUNCTION (3) Added-in: 7.74.0 ---

NAME

CURLOPT_HSTSREADDATA - pointer passed to the HSTS read callback

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTSREADDATA, void *pointer);

DESCRIPTION

Data pointer to pass to the HSTS read function. If you use the CURLOPT_HSTSREADFUNCTION(3) option, this is the pointer you get as input in the 3rd argument to the callback.

This option does not enable HSTS, you need to use CURLOPT_HSTS_CTRL(3) to do that.

DEFAULT

NULL

%PROTOCOLS%

EXAMPLE

struct MyData {
  void *custom;
};

int main(void)
{
  CURL *curl = curl_easy_init();
  struct MyData this;
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

    /* pass pointer that gets passed in to the
       CURLOPT_HSTSREADFUNCTION callback */
    curl_easy_setopt(curl, CURLOPT_HSTSREADDATA, &this);

    curl_easy_perform(curl);
  }
}

%AVAILABILITY%

RETURN VALUE

This returns CURLE_OK.