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        !            23: .TH CURLOPT_PROXY_SSL_VERIFYPEER 3 "December 16, 2016" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_PROXY_SSL_VERIFYPEER \- verify the proxy's SSL certificate
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_VERIFYPEER, long verify);
        !            31: .SH DESCRIPTION
        !            32: Pass a long as parameter set to 1L to enable or 0L to disable.
        !            33: 
        !            34: This option tells curl to verifies the authenticity of the HTTPS proxy's
        !            35: certificate. A value of 1 means curl verifies; 0 (zero) means it doesn't.
        !            36: 
        !            37: This is the proxy version of \fICURLOPT_SSL_VERIFYPEER(3)\fP that's used for
        !            38: ordinary HTTPS servers.
        !            39: 
        !            40: When negotiating a TLS or SSL connection, the server sends a certificate
        !            41: indicating its identity. Curl verifies whether the certificate is authentic,
        !            42: i.e. that you can trust that the server is who the certificate says it is.
        !            43: This trust is based on a chain of digital signatures, rooted in certification
        !            44: authority (CA) certificates you supply.  curl uses a default bundle of CA
        !            45: certificates (the path for that is determined at build time) and you can
        !            46: specify alternate certificates with the \fICURLOPT_PROXY_CAINFO(3)\fP option
        !            47: or the \fICURLOPT_PROXY_CAPATH(3)\fP option.
        !            48: 
        !            49: When \fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP is enabled, and the verification
        !            50: fails to prove that the certificate is authentic, the connection fails.  When
        !            51: the option is zero, the peer certificate verification succeeds regardless.
        !            52: 
        !            53: Authenticating the certificate is not enough to be sure about the server. You
        !            54: typically also want to ensure that the server is the server you mean to be
        !            55: talking to.  Use \fICURLOPT_PROXY_SSL_VERIFYHOST(3)\fP for that. The check
        !            56: that the host name in the certificate is valid for the host name you're
        !            57: connecting to is done independently of the
        !            58: \fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP option.
        !            59: 
        !            60: WARNING: disabling verification of the certificate allows bad guys to
        !            61: man-in-the-middle the communication without you knowing it. Disabling
        !            62: verification makes the communication insecure. Just having encryption on a
        !            63: transfer is not enough as you cannot be sure that you are communicating with
        !            64: the correct end-point.
        !            65: .SH DEFAULT
        !            66: 1
        !            67: .SH PROTOCOLS
        !            68: All
        !            69: .SH EXAMPLE
        !            70: .nf
        !            71: CURL *curl = curl_easy_init();
        !            72: if(curl) {
        !            73:   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
        !            74: 
        !            75:   /* Set the default value: strict certificate check please */
        !            76:   curl_easy_setopt(curl, CURLOPT_PROXY_SSL_VERIFYPEER, 1L);
        !            77: 
        !            78:   curl_easy_perform(curl);
        !            79: }
        !            80: .fi
        !            81: .SH AVAILABILITY
        !            82: Added in 7.52.0
        !            83: 
        !            84: If built TLS enabled.
        !            85: .SH RETURN VALUE
        !            86: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
        !            87: .SH "SEE ALSO"
        !            88: .BR CURLOPT_PROXY_SSL_VERIFYHOST "(3), "
        !            89: .BR CURLOPT_SSL_VERIFYPEER "(3), "
        !            90: .BR CURLOPT_SSL_VERIFYHOST "(3), "