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| .TH CURLOPT_SSL_FALSESTART 3 "November 04, 2020" "libcurl 7.78.0" "curl_easy_setopt options" |
| |
| .SH NAME |
| CURLOPT_SSL_FALSESTART \- enable TLS false start |
| .SH SYNOPSIS |
| #include <curl/curl.h> |
| |
| CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_FALSESTART, long enable); |
| .SH 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. |
| .SH DEFAULT |
| 0 |
| .SH PROTOCOLS |
| All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. |
| .SH EXAMPLE |
| .nf |
| 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); |
| } |
| .fi |
| .SH 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. |
| .SH RETURN VALUE |
| Returns CURLE_OK if false start is supported by the SSL backend, otherwise |
| returns CURLE_NOT_BUILT_IN. |
