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.TH CURLOPT_HSTSWRITEDATA 3 "14 Sep 2020" "libcurl 7.74.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_HSTSWRITEDATA \- pointer passed to the HSTS write callback
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTSWRITEDATA, void *pointer);
.fi
.SH DESCRIPTION
Data \fIpointer\fP to pass to the HSTS write function. If you use the
\fICURLOPT_HSTSWRITEFUNCTION(3)\fP option, this is the pointer you will get as
input in the 4th argument to the callback.

This option does not enable HSTS, you need to use \fICURLOPT_HSTS_CTRL(3)\fP to
do that.
.SH DEFAULT
NULL
.SH PROTOCOLS
This feature is only used for HTTP(S) transfer.
.SH EXAMPLE
.nf
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_HSTSWRITEFUNCTION callback */
  curl_easy_setopt(curl, CURLOPT_HSTSWRITEDATA, &this);

  curl_easy_perform(curl);
}
.fi
.SH AVAILABILITY
Added in 7.74.0
.SH RETURN VALUE
This will return CURLE_OK.
.SH "SEE ALSO"
.BR CURLOPT_HSTSWRITEFUNCTION "(3), " CURLOPT_HSTSREADDATA "(3), "
.BR CURLOPT_HSTSREADFUNCTION "(3), "