CURLOPT_CAPATH(3) Library Functions Manual CURLOPT_CAPATH(3)
NAME
CURLOPT_CAPATH - directory holding CA certificates
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAPATH, char *capath);
DESCRIPTION
Pass a char pointer to a null-terminated string naming a directory hold-
ing multiple CA certificates to verify the peer with. If libcurl is
built against OpenSSL, the certificate directory must be prepared using
the OpenSSL c_rehash utility. This makes sense only when used in combi-
nation with the CURLOPT_SSL_VERIFYPEER(3) option.
The CURLOPT_CAPATH(3) function apparently does not work in Windows due
to some limitation in OpenSSL.
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.
The default value for this can be figured out with CURLINFO_CAPATH(3).
DEFAULT
A path detected at build time.
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,
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/");
curl_easy_setopt(curl, CURLOPT_CAPATH, "/etc/cert-dir");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
AVAILABILITY
Added in curl 7.9.8
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
CURLINFO_CAPATH(3), CURLOPT_CAINFO(3), CURLOPT_DEBUGFUNCTION(3), CUR-
LOPT_STDERR(3)
libcurl 2026-07-12 CURLOPT_CAPATH(3)
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