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CURLOPT_SSL_FALSESTART(3)

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.

SEE ALSO
       CURLOPT_TCP_FASTOPEN(3),



libcurl 7.86.0                   May 17, 2022        CURLOPT_SSL_FALSESTART(3)
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