CURLOPT_PROXY_SSLKEYTYPE(3) Library Functions Manual NAME CURLOPT_PROXY_SSLKEYTYPE - type of the proxy private key file SYNOPSIS #include CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLKEYTYPE, char *type); 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 format of your private key. Supported formats are "PEM", "DER" and "ENG". The application does not have to keep the string around after setting this option. PROTOCOLS All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. This option works only with the following TLS backends: BearSSL, OpenSSL 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_SSLKEYTYPE, "PEM"); curl_easy_setopt(curl, CURLOPT_PROXY_KEYPASSWD, "s3cret"); res = curl_easy_perform(curl); curl_easy_cleanup(curl); } } AVAILABILITY Added in 7.52.0 RETURN VALUE Returns CURLE_OK if TLS is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space. SEE ALSO CURLOPT_PROXY_SSLCERT(3), CURLOPT_PROXY_SSLKEY(3), CURLOPT_SSLKEYTYPE(3) libcurl April 26 2024 CURLOPT_PROXY_SSLKEYTYPE(3)