table of contents
- bullseye 7.74.0-1.3+deb11u7
- bullseye-backports 7.88.1-7~bpo11+2
- testing 7.88.1-9
- unstable 7.88.1-10
- experimental 8.0.1-1~exp1
CURLOPT_HSTS_CTRL(3) | curl_easy_setopt options | 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),
October 22, 2022 | libcurl 7.87.0 |