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        !            23: .TH CURLOPT_PROXY_TLS13_CIPHERS 3 "October 31, 2019" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_PROXY_TLS13_CIPHERS \- ciphers suites for proxy TLS 1.3
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLS13_CIPHERS, char *list);
        !            31: .SH DESCRIPTION
        !            32: Pass a char *, pointing to a zero terminated string holding the list of cipher
        !            33: suites to use for the TLS 1.3 connection to a proxy. The list must be
        !            34: syntactically correct, it consists of one or more cipher suite strings
        !            35: separated by colons.
        !            36: 
        !            37: You'll find more details about cipher lists on this URL:
        !            38: 
        !            39:  https://curl.haxx.se/docs/ssl-ciphers.html
        !            40: 
        !            41: This option is currently used only when curl is built to use OpenSSL 1.1.1 or
        !            42: later. If you are using a different SSL backend you can try setting TLS 1.3
        !            43: cipher suites by using the CURLOPT_PROXY_SSL_CIPHER_LIST option.
        !            44: 
        !            45: The application does not have to keep the string around after setting this
        !            46: option.
        !            47: .SH DEFAULT
        !            48: NULL, use internal default
        !            49: .SH PROTOCOLS
        !            50: All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
        !            51: .SH EXAMPLE
        !            52: .nf
        !            53: CURL *curl = curl_easy_init();
        !            54: if(curl) {
        !            55:   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
        !            56:   curl_easy_setopt(curl, CURLOPT_PROXY_TLS13_CIPHERS,
        !            57:                    "TLS13-CHACHA20-POLY1305-SHA256");
        !            58:   ret = curl_easy_perform(curl);
        !            59:   curl_easy_cleanup(curl);
        !            60: }
        !            61: .fi
        !            62: .SH AVAILABILITY
        !            63: Added in 7.61.0.
        !            64: Available when built with OpenSSL >= 1.1.1.
        !            65: .SH RETURN VALUE
        !            66: Returns CURLE_OK if supported, CURLE_NOT_BUILT_IN otherwise.
        !            67: .SH "SEE ALSO"
        !            68: .BR CURLOPT_PROXY_SSL_CIPHER_LIST "(3), " CURLOPT_PROXY_SSLVERSION "(3), "
        !            69: .BR CURLOPT_SSL_CIPHER_LIST "(3), " CURLOPT_TLS13_CIPHERS "(3), "
        !            70: .BR CURLOPT_SSLVERSION "(3), "