Happy eyeballs (v1.13.0) - 31 Mar 2024

waitfordata: overlay to delay connection initiation until first data is attempted to be written to it
Dockerfile updates
lengthprefixed: overlay - alternative to base64 mode
Fix for #23 - "happy eyeballs" for ws:// and wss:// URLs.

Maintainance release (v1.12.0) - 17 Sep 2023

Option to stop sending or replying to WebSocket pings after specified amount of sent or received pings (for testing idling disconnection behaviour of counterparts).
--exec-exit-on-disconnect
Print Location: header value in error message when facing a redirect instead of a WebSocket connection.
Other minor fixes

--preamble (-p) options to prepend static text to Websocat sessions. For use to authenticate and subscribe to something over WebSocket. Note that specifying passwords on command line may be insecure. Also command line handling around -p is finicky. There is also --preamble-reverse (-P) option to prepend similar chunk in the reverse direction.
--compress-{zlib,deflate,gzip} and respective --uncompress-... options to modify binary WebSocket messages going to/from a WebSocket. Note that it is not related to permessage-deflate, which does similar thing, but on lower level.
exit_on_specific_byte: overlay to trigger exit when specific byte is encountered. For interactive tty usage.
--client-pkcs12-der to specify client identity certificate for connecting to wss:// or ssl: that requires mutual authentication.
openssl-probe is now active by default on Linux, to support for overriding CA lists using environment variables.
Incoming WebSocket frames and message are now limited by default, to prevent memory stuffing denial of service. But the default limit is big (100 megabytes). Use --max-ws-frame-length and --max-ws-message-length options to override.
Cargo.lock is now oriented for building with modern Rust compiler. There is Cargo.lock.legacy with dependencies manually locked to versions that support Rust 1.46.0.

Add --close-status-code and --close-reason
Fix --queue-len option that took no effect
Fix racing to connect to multiple resolved addresses in tcp: specifier (i.e. "happy eyeballs") - now it skips errors if there is a working connection. This does not fix ws://localhost unfortunately.
crypto: overlay and associated options
prometheus: overlay and associated options
random: specifier

ssl Cargo feature is now enabled by default
vendored_openssl Cargo feature is now not enabled by default
--stdout-announce-listening-ports option to print message when server port is ready to accept clients.
--no-close option now also affects Websocket server mode, not just client
timestamp: overlay to mangle message, prepending current timestamp as text
--print-ping-rtts option
Updated deps for #138 (not checked whether all yanks are resolved although).

--accept-from-fd option for better systemd intergration
exec:/cmd:/sh-c: specifiers now don't terminate process prematurely
--foreachmsg-wait-read for better foreachmsg: overlay behaviour. Now foreachmsg:exec:./myscript is more meaningul.
--basic-auth option to insert basic authentication header more easily
Websocket close message is now logged in debug mode

Websocat now does not set terminal to nonblocking mode if isatty by default. This should help with #76.
New overlay log: that prints bytes as they travel though Websocat, for debugging.

UDP multicast options
foreachmsg: overlay - run specifier (i.e. connect somewhere or execute a program) on each WebSocket message instead of on each WebSocket connection.
Various minor options like --max-messages or zero-length message handling.
Low-level Websocket features: --just-generate-key and --just-generate-accept options which help generating HTTP headers for WebSockets. ws-lowlevel-server: and ws-lowlevel-client: overlays to use expose WebSocket's data encoder/decoder without HTTP part.
Basic http:// client with arbitrary method, uri and so on.
Delay for autoreconnect: overlay
More pre-built release assets
Base64 mode for binary WebSocket messages
Prefixes for text and binary WebSocket messages, allowing to discriminate incoming binary and text WebSocket messages and intermix outgoing binary and text WebSocket messages.
Sort-of-unfinished http-post-sse: specifier allowing to use HTTP server-sent events (in one direction) and POST request bodies (in the other direction) instead of (or in addition to) a WebSocket and to bridge them together. This mode is not tested properly although.

Using client URI's like websocat ws://user:password@host/ now adds basic authentication HTTP header to request
New command-line option: --header-to-env
Minor dependencies update
Built with newer Rust on newer Debian

New options: --server-protocol, --ping-timeout, --ping-interval, --server-header
Fixed replying to WebSocket pings
Fixed replying to requests with Sec-WebSocket-Protocol.