package main import ( "flag" "fmt" "log" "net/http" "os" ) func main() { port := flag.Int("port", 3000, "Port to listen on") flag.Parse() addr := fmt.Sprintf(":%d", *port) username := os.Getenv("APP_USER_NAME") userID := os.Getenv("APP_USER_ID") http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "text/html; charset=utf-8") fmt.Fprintf(w, ` My App Instance

Welcome to Your Instance

This is your personal application instance

Instance Info

Port%d
User%s
User ID%s
StatusRunning

Navigation

`, *port, username, userID) }) http.HandleFunc("/admin", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "text/html; charset=utf-8") fmt.Fprintf(w, ` Admin Panel

Admin Panel

Private management interface

Admin Settings

Instance Port%d
Managed User%s
User ID%s

Actions

This is a private admin area. Only authenticated users should access this page.

← Back to Home
`, *port, username, userID) }) http.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "application/json") fmt.Fprintf(w, `{"status":"ok","port":%d,"user":"%s"}`, *port, username) }) log.Printf("Test app starting on %s (user=%s)", addr, username) log.Fatal(http.ListenAndServe(addr, nil)) }