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deps/curl/docs/libcurl/opts/CURLOPT_HSTS_CTRL.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_HSTS_CTRL
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_ALTSVC (3)
+  - CURLOPT_CONNECT_TO (3)
+  - CURLOPT_HSTS (3)
+  - CURLOPT_RESOLVE (3)
+---
+
+# NAME
+
+CURLOPT_HSTS_CTRL - control HSTS behavior
+
+# SYNOPSIS
+
+~~~c
+#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 then automatically redirects 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
+
+~~~c
+int main(void)
+{
+  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.