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CURLOPT_HSTS_CTRL(3) curl_easy_setopt options CURLOPT_HSTS_CTRL(3)
CURLOPT_HSTS_CTRL - control HSTS behavior
#define CURLHSTS_ENABLE (1<<0)
#define CURLHSTS_READONLYFILE (1<<1)
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTS_CTRL, long bitmask);
HSTS (HTTP Strict Transport Security) means that an HTTPS server can
instruct the client to not contact it again over clear-text HTTP for a
certain period into the future. libcurl will then automatically
redirect HTTP attempts to such hosts to instead use HTTPS. This is done
by libcurl retaining this knowledge in an in-memory cache.
Populate the long bitmask with the correct set of features to instruct
libcurl how to handle HSTS for the transfers using this handle.
Enable the in-memory HSTS cache for this handle.
Make the HSTS file (if specified) read-only - makes libcurl not
save the cache to the file when closing the handle.
0. HSTS is disabled by default.
HTTPS and HTTP
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_HSTS_CTRL, (long)CURLHSTS_ENABLE);
Added in 7.74.0
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
CURLOPT_HSTS(3), CURLOPT_CONNECT_TO(3), CURLOPT_RESOLVE(3),
libcurl 7.87.0 October 22, 2022 CURLOPT_HSTS_CTRL(3)