curl-w32/docs/cmdline-opts/tcp-fastopen.md

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Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. curl tcp-fastopen 7.49.0 Use TCP Fast Open connection boolean
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--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.