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23 .TH CURLOPT_PROXY_SSLVERSION 3 "January 10, 2018" "libcurl 7.59.0" "curl_easy_setopt options"
26 CURLOPT_PROXY_SSLVERSION \- set preferred proxy TLS/SSL version
28 #include <curl/curl.h>
30 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLVERSION, long version);
32 Pass a long as parameter to control which version of SSL/TLS to attempt to use
33 when connecting to an HTTPS proxy.
35 Use one of the available defines for this purpose. The available options are:
37 .IP CURL_SSLVERSION_DEFAULT
38 The default action. This will attempt to figure out the remote SSL protocol
40 .IP CURL_SSLVERSION_TLSv1
42 .IP CURL_SSLVERSION_TLSv1_0
44 .IP CURL_SSLVERSION_TLSv1_1
46 .IP CURL_SSLVERSION_TLSv1_2
48 .IP CURL_SSLVERSION_TLSv1_3
51 The maximum TLS version can be set by using \fIone\fP of the
52 CURL_SSLVERSION_MAX_ macros below. It is also possible to OR \fIone\fP of the
53 CURL_SSLVERSION_ macros with \fIone\fP of the CURL_SSLVERSION_MAX_ macros.
54 The MAX macros are not supported for SSL backends axTLS or wolfSSL.
56 .IP CURL_SSLVERSION_MAX_DEFAULT
57 The flag defines the maximum supported TLS version as TLSv1.2, or the default
58 value from the SSL library.
60 .IP CURL_SSLVERSION_MAX_TLSv1_0
61 The flag defines maximum supported TLS version as TLSv1.0.
63 .IP CURL_SSLVERSION_MAX_TLSv1_1
64 The flag defines maximum supported TLS version as TLSv1.1.
66 .IP CURL_SSLVERSION_MAX_TLSv1_2
67 The flag defines maximum supported TLS version as TLSv1.2.
69 .IP CURL_SSLVERSION_MAX_TLSv1_3
70 The flag defines maximum supported TLS version as TLSv1.3.
74 CURL_SSLVERSION_DEFAULT
79 CURL *curl = curl_easy_init();
81 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
83 /* ask libcurl to use TLS version 1.0 or later */
84 curl_easy_setopt(curl, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
86 /* Perform the request */
87 curl_easy_perform(curl);
93 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
95 .BR CURLOPT_USE_SSL "(3), " CURLOPT_HTTP_VERSION "(3), "
96 .BR CURLOPT_IPRESOLVE "(3) " CURLOPT_SSLVERSION "(3), "