main.go

package main

import (
	"github.com/kataras/iris/v12"
	"github.com/kataras/iris/v12/middleware/logger"
)

func main() {
	app := iris.New()

	customLogger := logger.New(logger.Config{
		// Status displays status code
		Status: true,
		// IP displays request's remote address
		IP: true,
		// Method displays the http method
		Method: true,
		// Path displays the request path
		Path: true,
		// Query appends the url query to the Path.
		Query: true,

		// Columns: true,

		// if !empty then its contents derives from `ctx.Values().Get("logger_message")
		// will be added to the logs.
		MessageContextKeys: []string{"logger_message"},

		// if !empty then its contents derives from `ctx.GetHeader("User-Agent")
		MessageHeaderKeys: []string{"User-Agent"},
	})

	app.Use(customLogger)

	h := func(ctx iris.Context) {
		ctx.Writef("Hello from %s", ctx.Path())
	}
	app.Get("/", h)

	app.Get("/1", h)

	app.Get("/2", h)

	// http errors have their own handlers, therefore
	// registering a middleare should be done manually.
	/*
	 app.OnErrorCode(404 ,customLogger, func(ctx iris.Context) {
	 	ctx.Writef("My Custom 404 error page ")
	 })
	*/
	// or catch all http errors:
	app.OnAnyErrorCode(customLogger, func(ctx iris.Context) {
		// this should be added to the logs, at the end because of the `logger.Config#MessageContextKey`
		ctx.Values().Set("logger_message",
			"a dynamic message passed to the logs")
		ctx.Writef("My Custom error page")
	})

	// http://localhost:8080
	// http://localhost:8080/1
	// http://localhost:8080/2
	// http://lcoalhost:8080/notfoundhere
	// see the output on the console.
	app.Run(iris.Addr(":8080"), iris.WithoutServerError(iris.ErrServerClosed))
}