GNURLOPT_TCP_FASTOPEN(3)

✨ NAME ✨

Okay so this is the GNURLOPT_TCP_FASTOPEN(3) manual page, and it's all about CURLOPT_TCP_FASTOPEN — the option that enables TCP Fast Open. Periodt. 💅

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🌸 SYNOPSIS 🌸

#include <gnurl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_FASTOPEN, long
       enable);

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🦋 DESCRIPTION 🦋

You pass a long as the parameter, and you set it to 1L to enable or 0 to disable. That's the whole vibe. ✨

TCP Fast Open (RFC7413) is literally a mechanism that allows data to be carried in the SYN and SYN-ACK packets and consumed by the receiving end during the initial connection handshake. The glow-up? It saves up to one full round-trip time (RTT). No cap. 🔥

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🎀 DEFAULT 🎀

The default is 0. So it's off unless you turn it on, bestie — you gotta opt in. 💤

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🌈 PROTOCOLS 🌈

All. Every protocol, no gatekeeping. 🫶

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👑 EXAMPLE 👑

Here's the whole vibe in code — keep it exactly like this, okay? 🍓

CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
  curl_easy_setopt(curl, CURLOPT_TCP_FASTOPEN, 1L);
  curl_easy_perform(curl);
}

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🧚 AVAILABILITY 🧚

Added in 7.49.0. This option is currently only supported on Linux and OS X El Capitan — yes, specifically El Capitan, iykyk. 🍓

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💜 RETURN VALUE 💜

Returns CURLE_OK if fast open is supported by the operating system, otherwise returns CURLE_NOT_BUILT_IN. No in-between, bestie. 💀

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k bye bestie! 🫶 this page came from libcurl 7.49.0, dated 16 Feb 2016, and it's the GNURLOPT_TCP_FASTOPEN(3) page — mwah 💋