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        !            23: .TH CURLOPT_ADDRESS_SCOPE 3 "March 07, 2019" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_ADDRESS_SCOPE \- set scope id for IPv6 addresses
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ADDRESS_SCOPE, long scope);
        !            31: .SH DESCRIPTION
        !            32: Pass a long specifying the scope id value to use when connecting to IPv6 addresses.
        !            33: .SH DEFAULT
        !            34: 0
        !            35: .SH PROTOCOLS
        !            36: All, when using IPv6
        !            37: .SH EXAMPLE
        !            38: .nf
        !            39: CURL *curl = curl_easy_init();
        !            40: if(curl) {
        !            41:   CURLcode ret;
        !            42:   long my_scope_id;
        !            43:   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
        !            44:   my_scope_id = if_nametoindex("eth0");
        !            45:   curl_easy_setopt(curl, CURLOPT_ADDRESS_SCOPE, my_scope_id);
        !            46:   ret = curl_easy_perform(curl);
        !            47:   curl_easy_cleanup(curl);
        !            48: }
        !            49: .fi
        !            50: .SH AVAILABILITY
        !            51: Added in 7.19.0
        !            52: .SH RETURN VALUE
        !            53: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
        !            54: Returns CURLE_BAD_FUNCTION_ARGUMENT if set to a negative value.
        !            55: .SH "SEE ALSO"
        !            56: .BR CURLOPT_STDERR "(3), " CURLOPT_DEBUGFUNCTION "(3), "