CURLOPT_PROXY_SSLCERT - set SSL proxy client certificate
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLCERT, char *cert);
This option is for connecting to a HTTPS proxy, not a HTTPS server.
Pass a pointer to a zero terminated string as parameter. The string should be
the file name 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 NSS or 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
Used with HTTPS proxy
CURL *curl = curl_easy_init();
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");
ret = curl_easy_perform(curl);
Added in 7.52.0
Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.