romenskiy2012/curl

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CURLOPT: drop redundant long casts

Also:
- CURLOPT_HSTS_CTRL.md: sync macro definitions with `curl/curl.h`.
  Perhaps it'd be better to delete copies like this?
- keep existing casts within the documentation to make sure it applies
  to older curl versions as well.
- CURLOPT_IPRESOLVE.md: re-add a long cast to man page, for consistency
  with the above.

Closes #17791

2025-07-28 10:32:13 +02:00

1.6 KiB

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SPDX-License-Identifier

Title

Section

Source

Protocol

See-also

Added-in

curl

CURLOPT_HSTS_CTRL

libcurl

HTTP

CURLOPT_ALTSVC (3)

CURLOPT_CONNECT_TO (3)

CURLOPT_HSTS (3)

CURLOPT_RESOLVE (3)

7.74.0

NAME

CURLOPT_HSTS_CTRL - control HSTS behavior

SYNOPSIS

#include <curl/curl.h>

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

%PROTOCOLS%

EXAMPLE

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%

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).

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