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_SSLCERTTYPE(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), CURLOPT_SSLCERT(3)

libcurl                                            2025-06-16                           CURLOPT_PROXY_SSLCERT(3)