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        !            22: .\"
        !            23: .TH CURLINFO_PROTOCOL 3 "April 14, 2020" "libcurl 7.70.0" "curl_easy_getinfo options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLINFO_PROTOCOL \- get the protocol used in the connection
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PROTOCOL, long *p);
        !            31: .SH DESCRIPTION
        !            32: Pass a pointer to a long to receive the version used in the last http
        !            33: connection.  The returned value will be exactly one of the CURLPROTO_* values:
        !            34: 
        !            35: .nf
        !            36: CURLPROTO_DICT, CURLPROTO_FILE, CURLPROTO_FTP, CURLPROTO_FTPS,
        !            37: CURLPROTO_GOPHER, CURLPROTO_HTTP, CURLPROTO_HTTPS, CURLPROTO_IMAP,
        !            38: CURLPROTO_IMAPS, CURLPROTO_LDAP, CURLPROTO_LDAPS, CURLPROTO_POP3,
        !            39: CURLPROTO_POP3S, CURLPROTO_RTMP, CURLPROTO_RTMPE, CURLPROTO_RTMPS,
        !            40: CURLPROTO_RTMPT, CURLPROTO_RTMPTE, CURLPROTO_RTMPTS, CURLPROTO_RTSP,
        !            41: CURLPROTO_SCP, CURLPROTO_SFTP, CURLPROTO_SMB, CURLPROTO_SMBS, CURLPROTO_SMTP,
        !            42: CURLPROTO_SMTPS, CURLPROTO_TELNET, CURLPROTO_TFTP, CURLPROTO_MQTT
        !            43: .SH PROTOCOLS
        !            44: All
        !            45: .SH EXAMPLE
        !            46: .nf
        !            47: CURL *curl = curl_easy_init();
        !            48: if(curl) {
        !            49:   CURLcode res;
        !            50:   curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
        !            51:   res = curl_easy_perform(curl);
        !            52:   if(res == CURLE_OK) {
        !            53:     long protocol;
        !            54:     curl_easy_getinfo(curl, CURLINFO_PROTOCOL, &protocol);
        !            55:   }
        !            56:   curl_easy_cleanup(curl);
        !            57: }
        !            58: .fi
        !            59: .SH AVAILABILITY
        !            60: Added in 7.52.0
        !            61: .SH RETURN VALUE
        !            62: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
        !            63: .SH "SEE ALSO"
        !            64: .BR CURLINFO_RESPONSE_CODE "(3), "
        !            65: .BR curl_easy_getinfo "(3), " curl_easy_setopt "(3), "