These files illustrate an issue with web sockets in Racket using net/rfc6455. The issue is only encountered when the server is run from Windows cmd or PowerShell, rather than (e.g.) DrRacket.

This repo was produced using Racket 8.10, but we also have reports of it happening on other 8.X versions.

• Run racket websocket-server.rkt from cmd or PowerShell.
• Run racket websocket-client.rkt from anywhere.

The connection will be refused. After a few seconds, an error will print:

$ racket websocket-client.rkt
tcp-connect: connection failed
  hostname: localhost
  port number: 8081
  system error: No connection could be made because the target machine actively refused it.; win_err=10061

• Run racket websocket-server.rkt from drracket, git bash, or wsl.
• Run racket websocket-client.rkt from anywhere.

The connection will be accepted, and the client will print "Hello world!". The server will show an error since the client disconnected ungracefully.