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 starts sending application data before verifying the server's  Finished  message,
       thus saving a round trip when performing a full handshake.

DEFAULT

       0

PROTOCOLS

       This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

       This option works only with the following TLS backends: Secure Transport

EXAMPLE

       int main(void)
       {
         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 curl 7.42.0

RETURN VALUE

       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

SEE ALSO

       CURLOPT_TCP_FASTOPEN(3)

libcurl                                            2025-03-05                          CURLOPT_SSL_FALSESTART(3)