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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2015, 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_SSLVERSION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_SSLVERSION \- set preferred TLS/SSL version
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLVERSION, long version);
+.SH DESCRIPTION
+Pass a long as parameter to control which version range of SSL/TLS versions to
+use.
+
+The SSL and TLS versions have typically developed from the most insecure
+version to be more and more secure in this order through history: SSL v2,
+SSLv3, TLS v1.0, TLS v1.1, TLS v1.2 and the most recent TLS v1.3.
+
+Use one of the available defines for this purpose. The available options are:
+.RS
+.IP CURL_SSLVERSION_DEFAULT
+The default acceptable version range. The minimum acceptable version is by
+default TLS v1.0 since 7.39.0 (unless the TLS library has a stricter rule).
+.IP CURL_SSLVERSION_TLSv1
+TLS v1.0 or later
+.IP CURL_SSLVERSION_SSLv2
+SSL v2 (but not SSLv3)
+.IP CURL_SSLVERSION_SSLv3
+SSL v3 (but not SSLv2)
+.IP CURL_SSLVERSION_TLSv1_0
+TLS v1.0 or later (Added in 7.34.0)
+.IP CURL_SSLVERSION_TLSv1_1
+TLS v1.1 or later (Added in 7.34.0)
+.IP CURL_SSLVERSION_TLSv1_2
+TLS v1.2 or later (Added in 7.34.0)
+.IP CURL_SSLVERSION_TLSv1_3
+TLS v1.3 or later (Added in 7.52.0)
+.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 by libcurl, or the default
+value from the SSL library is used. libcurl will use a sensible default
+maximum, which was TLS v1.2 up to before 7.61.0 and is TLS v1.3 since then -
+assuming the TLS library support it. (Added in 7.54.0)
+.IP CURL_SSLVERSION_MAX_TLSv1_0
+The flag defines maximum supported TLS version as TLS v1.0.
+(Added in 7.54.0)
+.IP CURL_SSLVERSION_MAX_TLSv1_1
+The flag defines maximum supported TLS version as TLS v1.1.
+(Added in 7.54.0)
+.IP CURL_SSLVERSION_MAX_TLSv1_2
+The flag defines maximum supported TLS version as TLS v1.2.
+(Added in 7.54.0)
+.IP CURL_SSLVERSION_MAX_TLSv1_3
+The flag defines maximum supported TLS version as TLS v1.3.
+(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 TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.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
+SSLv2 is disabled by default since 7.18.1. Other SSL versions availability may
+vary depending on which backend libcurl has been built to use.
+
+SSLv3 is disabled by default since 7.39.0.
+.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_PROXY_SSLVERSION "(3), " CURLOPT_IPRESOLVE "(3) "