CURLOPT_HSTS_CTRL - Online Linux Manual PageSection : 3
Updated : September 06, 2021
Source : libcurl 7.82.0
Note : curl_easy_setopt options
NAMECURLOPT_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);
DESCRIPTIONHSTS (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.
BITSCURLHSTS_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.
DEFAULT0. HSTS is disabled by default.
PROTOCOLSHTTPS and HTTP
EXAMPLECURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_HSTS_CTRL, CURLHSTS_ENABLE);
curl_easy_perform(curl);
}
AVAILABILITYAdded in 7.74.0
RETURN VALUEReturns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
SEE ALSOCURLOPT_HSTS(3), CURLOPT_CONNECT_TO (3), CURLOPT_RESOLVE (3)," CURLOPT_ALTSVC(3)," 0
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