How to Implement Request Logging Middleware in Go

Implement request logging middleware by creating a function that wraps an existing http.Handler, logs request details before calling the next handler, and returns the wrapped handler.

func LoggingMiddleware(next http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        log.Printf("%s %s", r.Method, r.URL.Path)
        next.ServeHTTP(w, r)
    })
}

Use it by wrapping your server's handler chain:

mux := http.NewServeMux()
mux.HandleFunc("/", handler)
log.Println("Server starting...")
log.Fatal(http.ListenAndServe(":8080", LoggingMiddleware(mux)))

Request logging middleware is a small piece of code that sits between your web server and incoming requests. It records details like the request method and URL path before passing the request along to your actual application logic. Think of it like a security guard at a building entrance who writes down every visitor's name and time of entry before letting them inside.