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CURLOPT_SSL_FALSESTART(3)  curl_easy_setopt options  CURLOPT_SSL_FALSESTART(3)

NAME

CURLOPT_SSL_FALSESTART - enable TLS false start

SYNOPSIS

#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_FALSESTART, long enable);

DESCRIPTION

Pass a long as parameter set to 1L to enable or 0 to disable. This option determines whether libcurl should use false start during the TLS handshake. False start is a mode where a TLS client will start sending application data before verifying the server's Finished message, thus saving a round trip when performing a full handshake.

DEFAULT

0

PROTOCOLS

All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

EXAMPLE

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

AVAILABILITY

Added in 7.42.0. This option is currently only supported by the NSS and Secure Transport (on iOS 7.0 or later, or OS X 10.9 or later) TLS backends.

RETURN VALUE

Returns CURLE_OK if false start is supported by the SSL backend, otherwise returns CURLE_NOT_BUILT_IN. libcurl 7.65.1 May 15, 2017 CURLOPT_SSL_FALSESTART(3)

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