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Viewing File: CURLOPT_PROXY_CAPATH.3

.\" generated by cd2nroff 0.1 from CURLOPT_PROXY_CAPATH.md
.TH CURLOPT_PROXY_CAPATH 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_PROXY_CAPATH \- directory holding HTTPS proxy CA certificates
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CAPATH, char *capath);
.fi
.SH 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
\fBc_rehash\fP utility. This makes sense only when
\fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP 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 \fICURLINFO_CAPATH(3)\fP.
.SH DEFAULT
NULL
.SH 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
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    /* using an HTTPS proxy */
    curl_easy_setopt(curl, CURLOPT_PROXY, "https://localhost:443");
    curl_easy_setopt(curl, CURLOPT_PROXY_CAPATH, "/etc/cert-dir");
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.52.0
.SH 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
.SH SEE ALSO
.BR CURLOPT_CAINFO (3),
.BR CURLOPT_DEBUGFUNCTION (3),
.BR CURLOPT_PROXY_CAINFO (3),
.BR CURLOPT_PROXY_SSL_VERIFYHOST (3),
.BR CURLOPT_STDERR (3)
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