main.go �<�8�U �B :�U package main import ( "context" "flag" "fmt" "log" "net/http" "os" "os/signal" "sync/atomic" "time" ) type key int const ( requestIDKey key = 0 ) var ( listenAddr string healthy int32 ) func main() { flag.StringVar(&listenAddr, "listen-addr", ":5000", "server listen address") flag.Parse() logger := log.New(os.Stdout, "http: ", log.LstdFlags) logger.Println("Server is starting