Provided by: libcurl4-doc_7.68.0-1ubuntu2.25_all bug

NAME

       CURLOPT_PROXY_CAINFO - path to proxy Certificate Authority (CA) bundle

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CAINFO, char *path);

DESCRIPTION

       This option is for connecting to an HTTPS proxy, not an HTTPS server.

       Pass  a  char  * to a zero terminated string naming a file holding one or more certificates to verify the
       HTTPS proxy with.

       If  CURLOPT_PROXY_SSL_VERIFYPEER(3)  is  zero  and  you  avoid  verifying   the   server's   certificate,
       CURLOPT_PROXY_CAINFO(3) need not even indicate an accessible file.

       This  option  is by default set to the system path where libcurl's cacert bundle is assumed to be stored,
       as established at build time.

       If curl is built against the NSS SSL library, the NSS PEM  PKCS#11  module  (libnsspem.so)  needs  to  be
       available for this option to work properly.

       (iOS  and  macOS  only)  If  curl  is  built  against Secure Transport, then this option is supported for
       backward compatibility with other SSL engines, but it should not be set. If the option is not  set,  then
       curl will use the certificates in the system and user Keychain to verify the peer, which is the preferred
       method of verifying the peer's certificate chain.

       The application does not have to keep the string around after setting this option.

DEFAULT

       Built-in system specific

PROTOCOLS

       Used with HTTPS proxy

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         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_CAINFO, "/etc/certs/cabundle.pem");
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY

       Added in 7.52.0

       For TLS backends that don't support certificate files, the  CURLOPT_PROXY_CAINFO(3)  option  is  ignored.
       Refer to https://curl.haxx.se/docs/ssl-compared.html

RETURN VALUE

       Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there
       was insufficient heap space.

SEE ALSO

       CURLOPT_PROXY_CAPATH(3),        CURLOPT_PROXY_SSL_VERIFYPEER(3),         CURLOPT_PROXY_SSL_VERIFYHOST(3),
       CURLOPT_CAPATH(3), CURLOPT_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3),