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curl/docs/libcurl/opts/CURLOPT_SSL_FALSESTART.3

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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <[email protected]>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_SSL_FALSESTART 3 "November 04, 2020" "libcurl 7.75.0" "curl_easy_setopt options"
+
+.SH NAME
+CURLOPT_SSL_FALSESTART \- enable TLS false start
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_FALSESTART, long enable);
+.SH 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.
+.SH DEFAULT
+0
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+.nf
+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);
+}
+.fi
+.SH 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.
+.SH RETURN VALUE
+Returns CURLE_OK if false start is supported by the SSL backend, otherwise
+returns CURLE_NOT_BUILT_IN.