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CURLOPT_PR...SSLVERSION(3) Library Functions Manual CURLOPT_PR...SSLVERSION(3)

NAME
       CURLOPT_PROXY_SSLVERSION	- preferred HTTPS proxy	TLS version

SYNOPSIS
       #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 op-
       tions 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_SSLVER-
       SION_MAX_ macros	below. It is also possible to OR one of	 the  CURL_SS-
       LVERSION_  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
       This functionality affects all TLS based	protocols: HTTPS, FTPS,	IMAPS,
       POP3S, SMTPS etc.

       All TLS backends	support	this option.

EXAMPLE
       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, (long)CURL_SSLVERSION_TLSv1);

	   /* Perform the request */
	   curl_easy_perform(curl);
	 }
       }

AVAILABILITY
       Added in	curl 7.52.0

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK	(0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLOPT_HTTP_VERSION(3),	 CURLOPT_IPRESOLVE(3),	CURLOPT_SSLVERSION(3),
       CURLOPT_USE_SSL(3)

libcurl				  2025-06-03	    CURLOPT_PR...SSLVERSION(3)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=CURLOPT_PROXY_SSLVERSION&sektion=3&manpath=FreeBSD+Ports+14.3.quarterly>

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