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        !            23: .TH CURLOPT_DNS_USE_GLOBAL_CACHE 3 "March 07, 2019" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_DNS_USE_GLOBAL_CACHE \- enable/disable global DNS cache
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_USE_GLOBAL_CACHE,
        !            31:                           long enable);
        !            32: .SH DESCRIPTION
        !            33: Has no function since 7.62.0. Do note use!
        !            34: 
        !            35: Pass a long. If the \fIenable\fP value is 1, it tells curl to use a global DNS
        !            36: cache that will survive between easy handle creations and deletions. This is
        !            37: not thread-safe and this will use a global variable.
        !            38: 
        !            39: \fBWARNING:\fP this option is considered obsolete. Stop using it. Switch over
        !            40: to using the share interface instead! See \fICURLOPT_SHARE(3)\fP and
        !            41: \fIcurl_share_init(3)\fP.
        !            42: .SH DEFAULT
        !            43: 0
        !            44: .SH PROTOCOLS
        !            45: All
        !            46: .SH EXAMPLE
        !            47: .nf
        !            48: CURL *curl = curl_easy_init();
        !            49: if(curl) {
        !            50:   CURLcode ret;
        !            51:   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
        !            52:   /* switch off the use of a global, thread unsafe, cache */
        !            53:   curl_easy_setopt(curl, CURLOPT_DNS_USE_GLOBAL_CACHE, 0L);
        !            54:   ret = curl_easy_perform(curl);
        !            55:   curl_easy_cleanup(curl);
        !            56: }
        !            57: .fi
        !            58: .SH AVAILABILITY
        !            59: Deprecated since 7.62.0. Has no function.
        !            60: .SH RETURN VALUE
        !            61: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
        !            62: .SH "SEE ALSO"
        !            63: .BR CURLOPT_SHARE "(3), " CURLOPT_DNS_CACHE_TIMEOUT "(3), "