我如何知道两台服务器何时准备接收请求？

Question

I have two servers

router := createServer()
loginServer := createLoginServerMock()
servLogin := &http.Server{
    Addr:         ":9333",
    Handler:      loginServer,
}
testServer := &http.Server{
    Addr:         ":9444",
    Handler:      router,
}
loginServer.ListenAndServe()
testServer.ListenAndServe()

And I want to send request on both of them after they created? How can I detect that?

Answer 1

ListenAndServe has no feedback mechanism to let you know when the server is ready. You have to create the listener yourself and pass it to Server.Serve:

loginListener, err := net.Listen("tcp", ":9333")
if err != nil {
    // TODO: handle err
}

testListener, err := net.Listen("tcp", ":9444")
if err != nil {
    // TODO: handle err
}

// You may already start sending requests now. They will just wait until
// the servers call Accept on their respective listener (i.e. shortly after
// Serve is called).

servLogin := &http.Server{Handler: loginServer}
testServer := &http.Server{Handler: router}

go func() { log.Fatal(servLogin.Serve(loginListener)) }()
go func() { log.Fatal(testServer.Serve(testListener)) }()