CURLOPT_PROXY_SSLCERTTYPE(3)                          Library Functions Manual

NAME
       CURLOPT_PROXY_SSLCERTTYPE - type of the proxy client SSL certificate

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLCERTTYPE, char *type);

DESCRIPTION
       Pass a pointer to a null-terminated string as parameter. The string
       should be the format of your client certificate used when connecting to
       an HTTPS proxy.

       Supported formats are "PEM" and "DER", except with Schannel. OpenSSL
       and Schannel support "P12" for PKCS#12-encoded files.

       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
       "PEM"

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, 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_SSLCERTTYPE, "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_SSLCERT(3), CURLOPT_PROXY_SSLKEY(3),
       CURLOPT_SSLCERTTYPE(3)

libcurl                           2025-07-16      CURLOPT_PROXY_SSLCERTTYPE(3)