Please see the related blog post at:
https://jimlawless.net/blog/posts/goecho/
The only command-line parameter echoserver expects is -p which allows the user to specify the port where the code will listen.
echoserver
echoserver v 0.95 by Jim Lawless
Syntax:
echoserver [flags]
where flags are:
-p="": port
echoserver -p 4023
echoserver v 0.95 by Jim Lawless
Port: 4023
Listening...
In another console/terminal session, we can telnet to this echo server via localhost.
telnet localhost 4023
Enter the word 'quit' (with no quotes) to exit.
hello
You said: hello
Enter the word 'quit' (with no quotes) to exit.
goodbye
You said: goodbye
Enter the word 'quit' (with no quotes) to exit.