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---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Long: tcp-fastopen
Added: 7.49.0
Help: Use TCP Fast Open
Category: connection
Multi: boolean
See-also:
  - false-start
Example:
  - --tcp-fastopen $URL
---

# `--tcp-fastopen`

Enable use of TCP Fast Open (RFC 7413). TCP Fast Open is a TCP extension that
allows data to get sent earlier over the connection (before the final
handshake ACK) if the client and server have been connected previously.