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)