ЯсноПонятно24

package main

import ( "fmt" "net/http" )

func helloHandler(w http.ResponseWriter, r *http.Request) { name := r.Context().Value("name").(string) fmt.Fprintf(w, "Hello, %s!", name) }

func Sanitize(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { name := r.URL.Query().Get("name") if name == "" { http.Error(w, "Name is required", http.StatusBadRequest) return } next.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), "name", name))) }) }

func SetDefaultName(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { name := r.URL.Query().Get("name") if name == "" { name = "stranger" } next.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), "name", name))) }) }

func main() { http.Handle("/hello", Sanitize(SetDefaultName(http.HandlerFunc(helloHandler))))

fmt.Println("Starting server on :8080")
http.ListenAndServe(":8080", nil)

}