websocat：Rust 编写的 WebSocket 的命令行客户端
https://github.com/vi/websocat
Connect to public echo server
$ websocat ws://ws.vi-server.org/mirror
123
123
ABC
ABC
Serve and connect
A$ websocat -s 1234
Listening on ws://127.0.0.1:1234/
ABC
123
B$ websocat ws://127.0.0.1:1234/
ABC
123
Open a tab in Chromium using remote debugging.
$ chromium --remote-debugging-port=9222&
$ curl -sg http://127.0.0.1:9222/json/new | grep webSocketDebuggerUrl | cut -d'"' -f4 | head -1
ws://127.0.0.1:9222/devtools/page/A331E56CCB8615EB4FCB720425A82259
$ echo 'Page.navigate {"url":"https://example.com"}' | websocat -n1 --jsonrpc --jsonrpc-omit-jsonrpc ws://127.0.0.1:9222/devtools/page/A331E56CCB8615EB4FCB720425A82259
{"id":2,"result":{"frameId":"A331E56CCB8615EB4FCB720425A82259","loaderId":"EF5AAD19F2F8BB27FAF55F94FFB27DF9"}}
Proxy TCP connections to WebSocket connections and back.
$ websocat --oneshot -b ws-l:127.0.0.1:1234 tcp:127.0.0.1:22&
$ websocat --oneshot -b tcp-l:127.0.0.1:1236 ws://127.0.0.1:1234/&
$ nc 127.0.0.1 1236
SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u3
qwertyu
Protocol mismatch.
Broadcast all messages between connected WebSocket clients
A$ websocat -t ws-l:127.0.0.1:1234 broadcast:mirror:
B$ websocat ws://127.0.0.1:1234
C$ websocat ws://127.0.0.1:1234
(if you like this one, you may actually want https://github.com/vi/wsbroad/ instead)