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CURLOPT_PROXY_CRLFILE(3)

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CURLOPT_PROXY_CRLFILE(3)   Library Functions Manual   CURLOPT_PROXY_CRLFILE(3)

NAME
       CURLOPT_PROXY_CRLFILE - HTTPS 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 pointer to a null-terminated string naming a file with the
       concatenation of CRL (in PEM format) to use in the certificate  valida‐
       tion that occurs during the SSL exchange.

       When  curl is built to use 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  CUR‐
       LOPT_PROXY_SSL_VERIFYPEER(3) option.

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

       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.

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 res;
           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");
           res = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY
       Added in curl 7.52.0

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       box; cbp-1 | cbp-1 l | l .  ATTRIBUTE TYPE ATTRIBUTE VALUE = Availabil‐
       ity   web/curl = Stability Uncommitted

SEE ALSO
       CURLOPT_PROXY_SSL_VERIFYHOST(3),  CURLOPT_PROXY_SSL_VERIFYPEER(3), CUR‐
       LOPT_SSL_VERIFYHOST(3), CURLOPT_SSL_VERIFYPEER(3)



NOTES
       Source code for open source software components in Oracle  Solaris  can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-
       code-downloads.html.

       This software was built from source available at:
       https://github.com/oracle/solaris-userland

       The original community source was downloaded from:
       https://curl.se/download/curl-8.17.0.tar.bz2

       Further information about this software can be found on the open source
       community website at http://curl.haxx.se/.

libcurl                           2025-12-01          CURLOPT_PROXY_CRLFILE(3)
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