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- .\" generated by cd2nroff 0.1 from CURLOPT_SSL_FALSESTART.md
- .TH CURLOPT_SSL_FALSESTART 3 "2025-01-17" libcurl
- .SH NAME
- CURLOPT_SSL_FALSESTART \- TLS false start
- .SH SYNOPSIS
- .nf
- #include <curl/curl.h>
- CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_FALSESTART, long enable);
- .fi
- .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 starts sending application
- data before verifying the server\(aqs Finished message, thus saving a round trip
- when performing a full handshake.
- .SH DEFAULT
- 0
- .SH 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
- .SH EXAMPLE
- .nf
- 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);
- }
- }
- .fi
- .SH AVAILABILITY
- Added in curl 7.42.0
- .SH RETURN VALUE
- Returns CURLE_OK if false start is supported by the SSL backend, otherwise
- returns CURLE_NOT_BUILT_IN.
- .SH SEE ALSO
- .BR CURLOPT_TCP_FASTOPEN (3)
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