CURLOPT_TCP_FASTOPEN - Online Linux Manual PageSection : 3
Updated : November 26, 2021
Source : libcurl 7.82.0
Note : curl_easy_setopt options
NAMECURLOPT_TCP_FASTOPEN − TCP Fast Open
SYNOPSIS#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_FASTOPEN, long enable);
DESCRIPTIONPass a long as parameter set to 1L to enable or 0 to disable. TCP Fast Open (RFC7413) is 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, saving up to one full round-trip time (RTT).
DEFAULT0
PROTOCOLSAll
EXAMPLECURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_TCP_FASTOPEN, 1L);
curl_easy_perform(curl);
}
AVAILABILITYAdded in 7.49.0. This option is currently only supported on Linux and OS X El Capitan.
RETURN VALUEReturns CURLE_OK if fast open is supported by the operating system, otherwise returns CURLE_NOT_BUILT_IN.
SEE ALSOCURLOPT_SSL_FALSESTART(3)," 0
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