CURLOPT_HSTSREADDATA - pointer passed to the HSTS read callback
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 will 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.
This feature is only used for HTTP(S) transfer.
CURL *curl = curl_easy_init();
struct MyData this;
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);
This will return CURLE_OK.