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CURLOPT_SSL_FALSESTART(3)           libcurl          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
       message, 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
       backends.


RETURN VALUE

       Returns CURLE_OK if false start is supported by the SSL backend,
       otherwise returns CURLE_NOT_BUILT_IN.


SEE ALSO

       CURLOPT_TCP_FASTOPEN(3),

ibcurl 8.1.2                    April 26, 2023       CURLOPT_SSL_FALSESTART(3)

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