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CURLOPT_HSTS_CTRL(3)                libcurl               CURLOPT_HSTS_CTRL(3)


NAME

       CURLOPT_HSTS_CTRL - control HSTS behavior


SYNOPSIS

       #include <curl/curl.h>

       #define CURLHSTS_ENABLE       (1<<0)
       #define CURLHSTS_READONLYFILE (1<<1)

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTS_CTRL, long bitmask);


DESCRIPTION

       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.


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. HSTS is disabled by default.


PROTOCOLS

       HTTPS and HTTP


EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_HSTS_CTRL, (long)CURLHSTS_ENABLE);
         curl_easy_perform(curl);
       }


AVAILABILITY

       Added in 7.74.0


RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
       if not.


SEE ALSO

       CURLOPT_HSTS(3), CURLOPT_CONNECT_TO(3), CURLOPT_RESOLVE(3),
       CURLOPT_ALTSVC(3),

ibcurl 8.1.2                    April 26, 2023            CURLOPT_HSTS_CTRL(3)

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