CURLOPT_HSTSREADDATA - Man Page

#include <curl/curl.h>

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

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.

NULL

This functionality affects http only

struct MyData {
  void *custom;
};

static CURLSTScode hsts_cb(CURL *easy, struct curl_hstsentry *sts,
                           void *clientp)
{
  /* populate the struct as documented */
  return CURLSTS_OK;
}

int main(void)
{
  CURL *curl = curl_easy_init();
  struct MyData this;
  if(curl) {
    CURLcode result;
    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);
    /* set HSTS read callback */
    curl_easy_setopt(curl, CURLOPT_HSTSREADFUNCTION, hsts_cb);

    result = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}

Added in curl 7.74.0

This returns CURLE_OK.

CURLOPT_HSTS(3), CURLOPT_HSTSREADFUNCTION(3), CURLOPT_HSTSWRITEDATA(3), CURLOPT_HSTSWRITEFUNCTION(3)

curl_easy_setopt(3), CURLOPT_HSTSREADFUNCTION(3), CURLOPT_HSTSWRITEDATA(3), libcurl-symbols(3).