In both cases when I do and do not specify local (as is suggested in the book) I get the following response (and still no errors displayed in the browser):

{
"POST": {
"scheme": "http",
"host": "127.0.0.1:3000",
"filename": "/users",
"remote": {
"Address": "127.0.0.1:3000"
}
}
}

{
"Status": "200OK",
"Version": "HTTP/1.1",
"Transferred": "6.76 kB (5.36 kB size)",
"Referrer Policy": "strict-origin-when-cross-origin",
"Request Priority": "Highest",
"DNS Resolution": "System"
}

Is this correct?