CURLOPT_PROXY_CRLFILE(3)   curl_easy_setopt options   CURLOPT_PROXY_CRLFILE(3)

NAME
       CURLOPT_PROXY_CRLFILE - specify a proxy Certificate Revocation List
       file

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CRLFILE, char
       *file);

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

       Pass a char * to a null-terminated string naming a file with the
       concatenation of CRL (in PEM format) to use in the certificate
       validation that occurs during the SSL exchange.

       When curl is built to use NSS or GnuTLS, there is no way to influence
       the use of CRL passed to help in the verification process. When libcurl
       is built with OpenSSL support, X509_V_FLAG_CRL_CHECK and
       X509_V_FLAG_CRL_CHECK_ALL are both set, requiring CRL check against all
       the elements of the certificate chain if a CRL file is passed.

       This option makes sense only when used in combination with the
       _PROXY_SSL_VERIFYPEER&section=3">CURLOPT_PROXY_SSL_VERIFYPEER(3) option.

       A specific error code (CURLE_SSL_CRL_BADFILE) is defined with the
       option. It is returned when the SSL exchange fails because the CRL file
       cannot be loaded.  A failure in certificate verification due to a
       revocation information found in the CRL does not trigger this specific
       error.

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

DEFAULT
       NULL

PROTOCOLS
       Used with HTTPS proxy.

EXAMPLE
       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
         curl_easy_setopt(curl, CURLOPT_PROXY, "https://localhost:80");
         curl_easy_setopt(curl, CURLOPT_PROXY_CRLFILE, "/etc/certs/crl.pem");
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY
       Added in 7.52.0

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_SSL_VERIFYPEER(3), CURLOPT_PROXY_SSL_VERIFYHOST(3),
       CURLOPT_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3),

libcurl 7.77.0                 November 4, 2020       CURLOPT_PROXY_CRLFILE(3)