CURLOPT_PROXY_CAPATH(3) Introduction to Library Functions

NAME

CURLOPT_PROXY_CAPATH - directory holding HTTPS proxy CA certificates

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CAPATH, char *capath);

DESCRIPTION

Pass a char pointer to a null-terminated string naming a directory
holding multiple CA certificates to verify the HTTPS proxy with. If
libcurl is built against OpenSSL, the certificate directory must be
prepared using the OpenSSL c_rehash utility. This makes sense only
when CURLOPT_PROXY_SSL_VERIFYPEER(3) is enabled (which it is by
default).

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 and switch
back to internal default.

The default value for this can be figured out with
CURLINFO_CAPATH(3).

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: GnuTLS,
OpenSSL and mbedTLS

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode result;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
/* using an HTTPS proxy */
curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy.example:443");
curl_easy_setopt(curl, CURLOPT_PROXY_CAPATH, "/etc/cert-dir");
result = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}

AVAILABILITY

Added in curl 7.52.0

RETURN VALUE

CURLE_OK if supported; or an error such as:

CURLE_NOT_BUILT_IN - Not supported by the SSL backend

CURLE_UNKNOWN_OPTION

CURLE_OUT_OF_MEMORY

SEE ALSO

CURLOPT_CAINFO(3), CURLOPT_DEBUGFUNCTION(3), CURLOPT_PROXY_CAINFO(3),
CURLOPT_PROXY_SSL_VERIFYHOST(3), CURLOPT_STDERR(3)

libcurl 2026-01-08 CURLOPT_PROXY_CAPATH(3)