CURLOPT_PROXY_KEYPASSWD(3) Library Functions Manual CURLOPT_PROXY_KEYPASSWD(3)
NAME
CURLOPT_PROXY_KEYPASSWD - passphrase for the proxy private key
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_KEYPASSWD, char *pwd);
DESCRIPTION
This option is for connecting to an HTTPS proxy, not an HTTPS server.
Pass a pointer to a null-terminated string as parameter. It is used as
the password required to use the CURLOPT_PROXY_SSLKEY(3) private key.
You never need a passphrase to load a certificate but you need one to
load your private key.
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: OpenSSL, Schan-
nel, 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/foo.bin");
curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy:443");
curl_easy_setopt(curl, CURLOPT_PROXY_KEYPASSWD, "superman");
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_KEYPASSWD(3), CURLOPT_PROXY_SSLKEY(3), CURLOPT_SSH_PRIVATE_KEY-
FILE(3), CURLOPT_SSLKEY(3)
libcurl 2026-07-12 CURLOPT_PROXY_KEYPASSWD(3)
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