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.TH CURLOPT_PROXY_SSLVERSION 3 "November 04, 2020" "libcurl 7.77.0" "curl_easy_setopt options"

.SH NAME
CURLOPT_PROXY_SSLVERSION \- set preferred proxy TLS/SSL version
.SH SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLVERSION, long version);
.SH 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:
.RS
.IP CURL_SSLVERSION_DEFAULT
The default action. This will attempt to figure out the remote SSL protocol
version.
.IP CURL_SSLVERSION_TLSv1
TLSv1.x
.IP CURL_SSLVERSION_TLSv1_0
TLSv1.0
.IP CURL_SSLVERSION_TLSv1_1
TLSv1.1
.IP CURL_SSLVERSION_TLSv1_2
TLSv1.2
.IP CURL_SSLVERSION_TLSv1_3
TLSv1.3
.RE
The maximum TLS version can be set by using \fIone\fP of the
CURL_SSLVERSION_MAX_ macros below. It is also possible to OR \fIone\fP of the
CURL_SSLVERSION_ macros with \fIone\fP of the CURL_SSLVERSION_MAX_ macros.
The MAX macros are not supported for WolfSSL.
.RS
.IP 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)
.IP CURL_SSLVERSION_MAX_TLSv1_0
The flag defines maximum supported TLS version as TLSv1.0.
(Added in 7.54.0)
.IP CURL_SSLVERSION_MAX_TLSv1_1
The flag defines maximum supported TLS version as TLSv1.1.
(Added in 7.54.0)
.IP CURL_SSLVERSION_MAX_TLSv1_2
The flag defines maximum supported TLS version as TLSv1.2.
(Added in 7.54.0)
.IP CURL_SSLVERSION_MAX_TLSv1_3
The flag defines maximum supported TLS version as TLSv1.3.
(Added in 7.54.0)
.RE

In versions of curl prior to 7.54 the CURL_SSLVERSION_TLS options were
documented to allow \fIonly\fP the specified TLS version, but behavior was
inconsistent depending on the TLS library.

.SH DEFAULT
CURL_SSLVERSION_DEFAULT
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
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);
}
.fi
.SH AVAILABILITY
Added in 7.52.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_USE_SSL "(3), " CURLOPT_HTTP_VERSION "(3), "
.BR CURLOPT_IPRESOLVE "(3) " CURLOPT_SSLVERSION "(3), "
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