CURLOPT_SSL_FALSESTART - TLS false start
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_FALSESTART, long enable);
CURLOPT_SSL_FALSESTART(3) curl_easy_setopt options CURLOPT_SSL_FALSESTART(3) NAME CURLOPT_SSL_FALSESTART - 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 mes- sage, 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 back- ends. RETURN VALUE Returns CURLE_OK if false start is supported by the SSL backend, other- wise returns CURLE_NOT_BUILT_IN. ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | web/curl | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ SEE ALSO CURLOPT_TCP_FASTOPEN(3), NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://curl.se/down- load/curl-7.83.1.tar.bz2. Further information about this software can be found on the open source community website at http://curl.haxx.se/. libcurl 7.83.1 November 26, 2021 CURLOPT_SSL_FALSESTART(3)