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51 lines
1.6 KiB
Groff
51 lines
1.6 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS.md
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.TH CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS 3 "2024-06-01" libcurl
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.SH NAME
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CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS \- head start for IPv6 for happy eyeballs
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS,
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long timeout);
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.fi
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.SH DESCRIPTION
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Happy eyeballs is an algorithm that attempts to connect to both IPv4 and IPv6
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addresses for dual\-stack hosts, preferring IPv6 first for \fItimeout\fP
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milliseconds. If the IPv6 address cannot be connected to within that time then
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a connection attempt is made to the IPv4 address in parallel. The first
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connection to be established is the one that is used.
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The range of suggested useful values for \fItimeout\fP is limited. Happy
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Eyeballs RFC 6555 says "It is RECOMMENDED that connection attempts be paced
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150\-250 ms apart to balance human factors against network load." libcurl
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currently defaults to 200 ms. Firefox and Chrome currently default to 300 ms.
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.SH DEFAULT
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CURL_HET_DEFAULT (currently defined as 200L)
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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.nf
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_setopt(curl, CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS, 300L);
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curl_easy_perform(curl);
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/* always cleanup */
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curl_easy_cleanup(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.59.0
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.SH RETURN VALUE
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Returns CURLE_OK
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.SH SEE ALSO
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.BR CURLOPT_CONNECTTIMEOUT_MS (3),
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.BR CURLOPT_LOW_SPEED_LIMIT (3),
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.BR CURLOPT_TIMEOUT (3)
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