CURLOPT_HSTSWRITEFUNCTION - write callback for HSTS hosts
#include <curl/curl.h> CURLSTScode hstswrite(CURL *easy, struct curl_hstsentry *sts,
struct curl_index *count, void *userp); CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTSWRITEFUNCTION, hstswrite);
Pass a pointer to your callback function, as the prototype shows above.
This callback function gets called by libcurl repeatedly to allow the application to store the in-memory HSTS cache when libcurl is about to discard it.
Set the userp argument with the CURLOPT_HSTSWRITEDATA(3) option or it will be NULL.
When the callback is invoked, the sts pointer points to a populated struct: Read the host name to 'name' (it is 'namelen' bytes long and null terminated. The 'includeSubDomains' field is non-zero if the entry matches subdomains. The 'expire' string is a date stamp null-terminated string using the syntax YYYYMMDD HH:MM:SS.
The callback should return CURLSTS_OK if it succeeded and is prepared to be called again (for another host) or CURLSTS_DONE if there's nothing more to do. It can also return CURLSTS_FAIL to signal error.
This option does not enable HSTS, you need to use CURLOPT_HSTS_CTRL(3) to do that.
NULL - no callback.
This feature is only used for HTTP(S) transfer.
/* set HSTS read callback */
curl_easy_setopt(curl, CURLOPT_HSTSWRITEFUNCTION, hstswrite);
/* pass in suitable argument to the callback */
curl_easy_setopt(curl, CURLOPT_HSTSWRITEDATA, &hstspreload);
result = curl_easy_perform(curl); }
Added in 7.74.0
This will return CURLE_OK.
|November 26, 2021||libcurl 7.81.0|