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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_PROXY_SSLVERSION
Section: 3
Source: libcurl
See-also:
- CURLOPT_HTTP_VERSION (3)
- CURLOPT_IPRESOLVE (3)
- CURLOPT_SSLVERSION (3)
- CURLOPT_USE_SSL (3)
---
# NAME
CURLOPT_PROXY_SSLVERSION - preferred HTTPS proxy TLS version
# SYNOPSIS
~~~c
#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
All
# EXAMPLE
~~~c
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, CURL_SSLVERSION_TLSv1);
/* Perform the request */
curl_easy_perform(curl);
}
}
~~~
# AVAILABILITY
Added in 7.52.0
# RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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