curl/docs/cmdline-opts/false-start.md
Daniel Stenberg 08a3e8e19a
TLS: remove support for Secure Transport and BearSSL
These libraries do not support TLS 1.3 and have been marked for removal
for over a year. We want to help users select a TLS dependency that is
future-proof and reliable, and not supporting TLS 1.3 in 2025 does not
infer confidence. Users who build libcurl are likely to be served better
and get something more future-proof with a TLS library that supports
1.3.

Closes #16677
2025-06-11 07:54:19 +02:00

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Markdown

---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Long: false-start
Help: Enable TLS False Start
Protocols: TLS
Added: 7.42.0
Category: tls
Multi: boolean
See-also:
- tcp-fastopen
Example:
- --false-start $URL
---
# `--false-start`
No TLS backend currently supports this feature.
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.