golang 构建Web服务器

main.go

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package main   import (     "fmt"     "log"     "net/http" )   func loggingMiddleware(next http.Handler) http.Handler {     return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {         log.Printf("%s %s\n", r.Method, r.URL.Path)         next.ServeHTTP(w, r)     }) }   func helloHandler(w http.ResponseWriter, r *http.Request) {     fmt.Fprintln(w, "Hello, with middleware!") }   func main() {     mux := http.NewServeMux()     mux.HandleFunc("/", helloHandler)       server := &http.Server{         Addr:    ":8080",         Handler: loggingMiddleware(mux),     }       log.Println("Starting server on :8080...")     if err := server.ListenAndServe(); err != nil {         log.Fatal(err)     } }