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CURLOPT_HSTS_CTRL(3) Library Functions Manual CURLOPT_HSTS_CTRL(3) NAME CURLOPT_HSTS_CTRL - control HSTS behavior SYNOPSIS #include <curl/curl.h> #define CURLHSTS_ENABLE (1L << 0) #define CURLHSTS_READONLYFILE (1L << 1) CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTS_CTRL, long bitmask); DESCRIPTION HSTS (HTTP Strict Transport Security) means that an HTTPS server can in- struct the client to not contact it again over clear-text HTTP for a cer- tain period into the future. libcurl then automatically redirects HTTP at- tempts to such hosts to instead use HTTPS. This is done by libcurl retain- ing 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. BITS CURLHSTS_ENABLE Enable the in-memory HSTS cache for this handle. CURLHSTS_READONLYFILE Make the HSTS file (if specified) read-only - makes libcurl not save the cache to the file when closing the handle. DEFAULT 0 PROTOCOLS This functionality affects http only EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; /* enable HSTS */ curl_easy_setopt(curl, CURLOPT_HSTS_CTRL, CURLHSTS_ENABLE); /* specify where to store the HSTS cache */ curl_easy_setopt(curl, CURLOPT_HSTS, "/home/user/.hsts-cache"); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } AVAILABILITY Added in curl 7.74.0 RETURN VALUE curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). SEE ALSO CURLOPT_ALTSVC(3), CURLOPT_CONNECT_TO(3), CURLOPT_HSTS(3), CURLOPT_RE- SOLVE(3) libcurl 2026-06-11 CURLOPT_HSTS_CTRL(3)
NAME | SYNOPSIS | DESCRIPTION | BITS | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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