Man page - curlopt_proxy_sslversion(3)
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apt-get install libcurl4-doc
Manual
CURLOPT_PROXY_SSLVERSION
NAMESYNOPSIS
DESCRIPTION
DEFAULT
PROTOCOLS
EXAMPLE
AVAILABILITY
RETURN VALUE
SEE ALSO
NAME
CURLOPT_PROXY_SSLVERSION - preferred HTTPS proxy TLS version
SYNOPSIS
#include <curl/curl.h>
CURLcode
curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLVERSION,
long version);
DESCRIPTION
Pass a long as parameter to control which version of SSL/TLS to attempt to use when connecting to an HTTPS proxy.
Use one of the
available defines for this purpose. The available options
are:
CURL_SSLVERSION_DEFAULT
The default action. This attempts to figure out the remote SSL protocol version.
CURL_SSLVERSION_TLSv1
TLSv1.x
CURL_SSLVERSION_TLSv1_0
TLSv1.0
CURL_SSLVERSION_TLSv1_1
TLSv1.1
CURL_SSLVERSION_TLSv1_2
TLSv1.2
CURL_SSLVERSION_TLSv1_3
TLSv1.3
The maximum TLS
version can be set by using
one
of the
CURL_SSLVERSION_MAX_ macros below. It is also possible to OR
one
of the CURL_SSLVERSION_ macros with
one
of
the CURL_SSLVERSION_MAX_ macros. The MAX macros are not
supported for wolfSSL.
CURL_SSLVERSION_MAX_DEFAULT
The flag defines the maximum supported TLS version as TLSv1.2, or the default value from the SSL library. (Added in 7.54.0)
CURL_SSLVERSION_MAX_TLSv1_0
The flag defines maximum supported TLS version as TLSv1.0. (Added in 7.54.0)
CURL_SSLVERSION_MAX_TLSv1_1
The flag defines maximum supported TLS version as TLSv1.1. (Added in 7.54.0)
CURL_SSLVERSION_MAX_TLSv1_2
The flag defines maximum supported TLS version as TLSv1.2. (Added in 7.54.0)
CURL_SSLVERSION_MAX_TLSv1_3
The flag defines maximum supported TLS version as TLSv1.3. (Added in 7.54.0)
In versions of curl prior to 7.54 the CURL_SSLVERSION_TLS options were documented to allow only the specified TLS version, but behavior was inconsistent depending on the TLS library.
DEFAULT
CURL_SSLVERSION_DEFAULT
PROTOCOLS
This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
All TLS backends support this option.
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL,
"https://example.com");
/* ask libcurl
to use TLS version 1.0 or later */
curl_easy_setopt(curl, CURLOPT_SSLVERSION,
(long)CURL_SSLVERSION_TLSv1);
/* Perform the
request */
curl_easy_perform(curl);
}
}
AVAILABILITY
Added in curl 7.52.0
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) .
SEE ALSO
CURLOPT_HTTP_VERSION (3), CURLOPT_IPRESOLVE (3), CURLOPT_SSLVERSION (3), CURLOPT_USE_SSL (3)