63 lines
1.3 KiB
Markdown
63 lines
1.3 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_SSL_FALSESTART
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_TCP_FASTOPEN (3)
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---
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# NAME
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CURLOPT_SSL_FALSESTART - TLS false start
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_FALSESTART, long enable);
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~~~
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# DESCRIPTION
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Pass a long as parameter set to 1L to enable or 0 to disable.
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This option determines whether libcurl should use false start during the TLS
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handshake. False start is a mode where a TLS client starts sending application
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data before verifying the server's Finished message, thus saving a round trip
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when performing a full handshake.
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# DEFAULT
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0
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# PROTOCOLS
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All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
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# EXAMPLE
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~~~c
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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_SSL_FALSESTART, 1L);
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curl_easy_perform(curl);
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}
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}
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~~~
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# AVAILABILITY
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Added in 7.42.0. This option is currently only supported by the Secure
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Transport (on iOS 7.0 or later, or OS X 10.9 or later) TLS backend.
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# RETURN VALUE
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Returns CURLE_OK if false start is supported by the SSL backend, otherwise
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returns CURLE_NOT_BUILT_IN.
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