ejemplos basicos web middlewares

middleware.go

package http

import (
	"context"
	"log"
	"net/http"
	"time"
)

func JsonMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		next.ServeHTTP(w, r)
	})
}

func LogMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		log.Println("method:", r.Method, "|", "path:", r.URL.Path, "| handled request")
		next.ServeHTTP(w, r)
	})
}

func TimeoutMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		ctx, cancel := context.WithTimeout(r.Context(), 15*time.Second)
		defer cancel()
		next.ServeHTTP(w, r.WithContext(ctx))
	})
}