CURLOPT_PROXY_SSLCERTTYPE - specify type of the proxy client SSL certificate
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLCERTTYPE, char *type);
Pass a pointer to a zero terminated string as parameter. The string should be
the format of your client certificate used when connecting to a HTTPS proxy.
Supported formats are "PEM" and "DER", except with Secure
Transport. OpenSSL (versions 0.9.3 and later) and Secure Transport (on iOS 5
or later, or OS X 10.7 or later) also support "P12" for
The application does not have to keep the string around after setting this
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_SSLCERTTYPE, "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
If built TLS enabled.
Returns CURLE_OK if TLS is supported, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.