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        !            23: .TH CURLOPT_PROXY_SSL_OPTIONS 3 "March 23, 2020" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_PROXY_SSL_OPTIONS \- set proxy SSL behavior options
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_OPTIONS, long bitmask);
        !            31: .SH DESCRIPTION
        !            32: Pass a long with a bitmask to tell libcurl about specific SSL
        !            33: behaviors. Available bits:
        !            34: .IP CURLSSLOPT_ALLOW_BEAST
        !            35: Tells libcurl to not attempt to use any workarounds for a security flaw in the
        !            36: SSL3 and TLS1.0 protocols.  If this option isn't used or this bit is set to 0,
        !            37: the SSL layer libcurl uses may use a work-around for this flaw although it
        !            38: might cause interoperability problems with some (older) SSL
        !            39: implementations. WARNING: avoiding this work-around lessens the security, and
        !            40: by setting this option to 1 you ask for exactly that.  This option is only
        !            41: supported for DarwinSSL, NSS and OpenSSL.
        !            42: .IP CURLSSLOPT_NO_REVOKE
        !            43: Tells libcurl to disable certificate revocation checks for those SSL backends
        !            44: where such behavior is present. This option is only supported for Schannel
        !            45: (the native Windows SSL library), with an exception in the case of Windows'
        !            46: Untrusted Publishers blacklist which it seems can't be bypassed. (Added in
        !            47: 7.44.0)
        !            48: .IP CURLSSLOPT_NO_PARTIALCHAIN
        !            49: Tells libcurl to not accept "partial" certificate chains, which it otherwise
        !            50: does by default. This option is only supported for OpenSSL and will fail the
        !            51: certificate verification if the chain ends with an intermediate certificate
        !            52: and not with a root cert. (Added in 7.68.0)
        !            53: 
        !            54: .IP CURLSSLOPT_REVOKE_BEST_EFFORT
        !            55: Tells libcurl to ignore certificate revocation checks in case of missing or
        !            56: offline distribution points for those SSL backends where such behavior is
        !            57: present. This option is only supported for Schannel (the native Windows SSL
        !            58: library). If combined with \fICURLSSLOPT_NO_REVOKE\fP, the latter takes
        !            59: precedence. (Added in 7.70.0)
        !            60: .SH DEFAULT
        !            61: 0
        !            62: .SH PROTOCOLS
        !            63: All TLS-based protocols
        !            64: .SH AVAILABLE
        !            65: Added in 7.52.0
        !            66: .SH EXAMPLE
        !            67: .nf
        !            68: CURL *curl = curl_easy_init();
        !            69: if(curl) {
        !            70:   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
        !            71:   curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy");
        !            72:   /* weaken TLS only for use with silly proxies */
        !            73:   curl_easy_setopt(curl, CURLOPT_PROXY_SSL_OPTIONS, CURLSSLOPT_ALLOW_BEAST |
        !            74:                    CURLSSLOPT_NO_REVOKE);
        !            75:   ret = curl_easy_perform(curl);
        !            76:   curl_easy_cleanup(curl);
        !            77: }
        !            78: .fi
        !            79: .SH RETURN VALUE
        !            80: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
        !            81: .SH "SEE ALSO"
        !            82: .BR CURLOPT_PROXY_SSLVERSION "(3), " CURLOPT_PROXY_SSL_CIPHER_LIST "(3), "
        !            83: .BR CURLOPT_SSLVERSION "(3), " CURLOPT_SSL_CIPHER_LIST "(3), "