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53 <p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
54 <p class="level0">CURLOPT_SSLVERSION - set preferred TLS/SSL version <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
55 <p class="level0">#include <curl/curl.h>
56 <p class="level0">CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLVERSION, long version); <a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
57 <p class="level0">Pass a long as parameter to control which version of SSL/TLS to attempt to use.
58 <p class="level0">Use one of the available defines for this purpose. The available options are:
60 <p class="level0"><a name="CURLSSLVERSIONDEFAULT"></a><span class="nroffip">CURL_SSLVERSION_DEFAULT</span>
61 <p class="level1">The default action. This will attempt to figure out the remote SSL protocol version.
62 <p class="level0"><a name="CURLSSLVERSIONTLSv1"></a><span class="nroffip">CURL_SSLVERSION_TLSv1</span>
63 <p class="level1">TLSv1.x
64 <p class="level0"><a name="CURLSSLVERSIONSSLv2"></a><span class="nroffip">CURL_SSLVERSION_SSLv2</span>
65 <p class="level1">SSLv2
66 <p class="level0"><a name="CURLSSLVERSIONSSLv3"></a><span class="nroffip">CURL_SSLVERSION_SSLv3</span>
67 <p class="level1">SSLv3
68 <p class="level0"><a name="CURLSSLVERSIONTLSv10"></a><span class="nroffip">CURL_SSLVERSION_TLSv1_0</span>
69 <p class="level1">TLSv1.0 (Added in 7.34.0)
70 <p class="level0"><a name="CURLSSLVERSIONTLSv11"></a><span class="nroffip">CURL_SSLVERSION_TLSv1_1</span>
71 <p class="level1">TLSv1.1 (Added in 7.34.0)
72 <p class="level0"><a name="CURLSSLVERSIONTLSv12"></a><span class="nroffip">CURL_SSLVERSION_TLSv1_2</span>
73 <p class="level1">TLSv1.2 (Added in 7.34.0)
74 <p class="level0"><a name="DEFAULT"></a><h2 class="nroffsh">DEFAULT</h2>
75 <p class="level0">CURL_SSLVERSION_DEFAULT <a name="PROTOCOLS"></a><h2 class="nroffsh">PROTOCOLS</h2>
76 <p class="level0">All TLS based protocols: HTTPS, FTPS, IMAPS, POP3, SMTPS etc. <a name="EXAMPLE"></a><h2 class="nroffsh">EXAMPLE</h2>
77 <p class="level0"><pre class="level0">
78 CURL *curl = curl_easy_init();
80 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
82 /* ask libcurl to use TLS version 1.0 or later */
83 curl_easy_setopt(curl, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
85 /* Perform the request */
86 curl_easy_perform(curl);
90 <p class="level0"><a name="AVAILABILITY"></a><h2 class="nroffsh">AVAILABILITY</h2>
91 <p class="level0">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.
92 <p class="level0">SSLv3 is disabled by default since 7.39.0. <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
93 <p class="level0">Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
94 <p class="level0"><a Class="manpage" href="./CURLOPT_USE_SSL.html">CURLOPT_USE_SSL</a>, <a Class="manpage" href="./CURLOPT_HTTP_VERSION.html">CURLOPT_HTTP_VERSION</a>, <span Class="manpage"> </span> <a Class="manpage" href="./CURLOPT_IPRESOLVE.html">CURLOPT_IPRESOLVE</a>, <p class="roffit">
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