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- bookworm 7.88.1-10+deb12u8
- bookworm-backports 8.10.1-1~bpo12+1
- testing 8.10.1-2
- unstable 8.11.0-1
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 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¶
January 2, 2023 | libcurl 7.88.1 |