Links

• Websocat4 documentation - tracks the websocat4 branch, not specific to the release.
• Missing Websocat1 features list for voting.

Notes for pre-built files

• i686-unknown-linux-musl lacks TLS support
• arm-unknown-linux-musleabi uses Rustls instead of OpenSSL
• Other Linux and the FreeBSD executable embed OpenSSL 3.5.4.
• Windows and Mac should use native TLS.

Changelog

compared to v4.0.0-alpha2:

New endpoints:

• zero: - like /dev/zero
• mirror: - both for byte streams and for datagrams
• registry-send: to aid --compose mode.
• registry-datagram-{listen,connect}:

New overlays:

• write-splitof: to divert outgoing datagrams to other chain (specified using --write-splitoff option).
• defragment: to cache datagram fragments and propagate the whole thing.
• tee: to also write datagrams (and maybe read) to other chain

New options:

• --filter and --filter-reverse to construct circuits of more than two endpoints.
• --async-fd-force to use even non-epoll-able async-fd:s.
• --enable-sslkeylog (only for Rustls mode)
• --separator-inline to leave \ns inside WebSocket messages
• A lot of socket options for TCP (including setting up keepalive) and UDP (including for multicast)
• --tcp-race-interval-ms - happy eyeballs TCP client race is now paced by 20ms by default.

Other changes:

• More thorough tests with the help of mock_stream_socket: endpoint
• Exit code of Websocat process now indicates what stage of WebSocket client mode has failed.