CURLOPT_HSTS - HSTS cache file name
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTS, char *filename);
Make the
filename point to a file name to load an existing HSTS cache
from, and to store the cache in when the easy handle is closed. Setting a file
name with this option will also enable HSTS for this handle (the equivalent of
setting
CURLHSTS_ENABLE with
CURLOPT_HSTS_CTRL(3)).
If the given file does not exist or contains no HSTS entries at startup, the
HSTS cache will simply start empty. Setting the file name to NULL or
"" will only enable HSTS without reading from or writing to any
file.
If this option is set multiple times, libcurl will load cache entries from each
given file but will only store the last used name for later writing.
The HSTS cache is saved to and loaded from a text file with one entry per
physical line. Each line in the file has the following format:
[host] [stamp]
[host] is the domain name for the entry and the name is dot-prefixed if it is an
entry valid for all subdomains to the name as well or only for the exact name.
[stamp] is the time (in UTC) when the entry expires and it uses the format
"YYYYMMDD HH:MM:SS".
Lines starting with "#" are treated as comments and are ignored. There
is currently no length or size limit.
NULL, no file name
HTTPS and HTTP
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_HSTS, "/home/user/.hsts-cache");
curl_easy_perform(curl);
}
Added in 7.74.0
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
CURLOPT_HSTS_CTRL(3),
CURLOPT_ALTSVC(3),
CURLOPT_RESOLVE(3),