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CURLOPT_PROXY_SSLCERT(3)   Library Functions Manual   CURLOPT_PROXY_SSLCERT(3)

NAME
       CURLOPT_PROXY_SSLCERT - HTTPS proxy client certificate

SYNOPSIS
       #include	<curl/curl.h>

       CURLcode	curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLCERT, char *cert);

DESCRIPTION
       This option is for connecting to	an HTTPS proxy,	not an HTTPS server.

       Pass  a	pointer	 to  a null-terminated string as parameter. The	string
       should be the filename of your client certificate used  to  connect  to
       the  HTTPS  proxy.  The default format is "P12" on Secure Transport and
       "PEM" on	other engines, and can be changed with	CURLOPT_PROXY_SSLCERT-
       TYPE(3).

       With Secure Transport, this can also be the nickname of the certificate
       you  wish to authenticate with as it is named in	the security database.
       If you want to use a file from the current directory, please precede it
       with "./" prefix, in order to avoid confusion with a nickname.

       When using a client certificate,	you most likely	also need to provide a
       private key with	CURLOPT_PROXY_SSLKEY(3).

       The application does not	have to	keep the string	around	after  setting
       this option.

       Using this option multiple times	makes the last set string override the
       previous	ones. Set it to	NULL to	disable	its use	again.

DEFAULT
       NULL

PROTOCOLS
       This functionality affects all TLS based	protocols: HTTPS, FTPS,	IMAPS,
       POP3S, SMTPS etc.

       This  option  works  only  with	the  following	TLS  backends: GnuTLS,
       OpenSSL,	Schannel, Secure Transport, mbedTLS and	wolfSSL

EXAMPLE
       int main(void)
       {
	 CURL *curl = curl_easy_init();
	 if(curl) {
	   CURLcode res;
	   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
	   curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy");
	   curl_easy_setopt(curl, CURLOPT_PROXY_SSLCERT, "client.pem");
	   curl_easy_setopt(curl, CURLOPT_PROXY_SSLKEY,	"key.pem");
	   curl_easy_setopt(curl, CURLOPT_PROXY_KEYPASSWD, "s3cret");
	   res = curl_easy_perform(curl);
	   curl_easy_cleanup(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_PROXY_SSLCERTTYPE(3),	   CURLOPT_PROXY_SSLKEY(3),	  CUR-
       LOPT_SSLCERT(3)

libcurl				  2025-06-03	      CURLOPT_PROXY_SSLCERT(3)

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