NAME

       CURLOPT_PROXY_SSL_CIPHER_LIST - ciphers to use for HTTPS proxy

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_CIPHER_LIST,
                                 char *list);

DESCRIPTION

       Pass  a  char pointer, pointing to a null-terminated string holding the list of ciphers to
       use for the connection to the HTTPS proxy. The list  must  be  syntactically  correct,  it
       consists  of  one  or  more  cipher strings separated by colons. Commas or spaces are also
       acceptable separators but colons are  normally  used,  &!,  &-  and  &+  can  be  used  as
       operators.

       For OpenSSL and GnuTLS valid examples of cipher lists include RC4-SHA, SHA1+DES, TLSv1 and
       DEFAULT. The default list is normally set when you compile OpenSSL.

       For   wolfSSL,   valid   examples   of    cipher    lists    include    ECDHE-RSA-RC4-SHA,
       AES256-SHA:AES256-SHA256, etc.

       For    mbedTLS    and    BearSSL,    valid    examples    of    cipher    lists    include
       ECDHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-AES128-GCM-SHA256,  or   when   using   IANA   names
       TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256:TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,    etc.
       With mbedTLS and BearSSL you do not add/remove ciphers. If one uses this option  then  all
       known ciphers are disabled and only those passed in are enabled.

       Find more details about cipher lists on this URL:

        https://curl.se/docs/ssl-ciphers.html

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

DEFAULT

       NULL, use internal built-in list.

PROTOCOLS

       This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

       This  option  works  only  with  the  following  TLS  backends:  BearSSL, GnuTLS, OpenSSL,
       Schannel, Secure Transport, 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_PROXY, "https://localhost");
           curl_easy_setopt(curl, CURLOPT_PROXY_SSL_CIPHER_LIST, "TLSv1");
           res = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in curl 7.52.0

RETURN VALUE

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

SEE ALSO

       CURLOPT_PROXY_SSLVERSION(3),     CURLOPT_PROXY_TLS13_CIPHERS(3),    CURLOPT_SSLVERSION(3),
       CURLOPT_SSL_CIPHER_LIST(3), CURLOPT_TLS13_CIPHERS(3)