我们在上一节所看到的应用程序记录器用于记录与应用程序相关的信息和错误。另一方面，我们在下面看到的 ​Access Logger​ 用于记录传入的 HTTP 请求和响应。

package main

import (
    "os"

    "github.com/kataras/iris/v12"
    "github.com/kataras/iris/v12/middleware/accesslog"
)

// Read the example and its comments carefully.
func makeAccessLog() *accesslog.AccessLog {
    // Initialize a new access log middleware.
    ac := accesslog.File("./access.log")
    // Remove this line to disable logging to console:
    ac.AddOutput(os.Stdout)

    // The default configuration:
    ac.Delim = '|'
    ac.TimeFormat = "2006-01-02 15:04:05"
    ac.Async = false
    ac.IP = true
    ac.BytesReceivedBody = true
    ac.BytesSentBody = true
    ac.BytesReceived = false
    ac.BytesSent = false
    ac.BodyMinify = true
    ac.RequestBody = true
    ac.ResponseBody = false
    ac.KeepMultiLineError = true
    ac.PanicLog = accesslog.LogHandler

    // Default line format if formatter is missing:
    // Time|Latency|Code|Method|Path|IP|Path Params Query Fields|Bytes Received|Bytes Sent|Request|Response|
    //
    // Set Custom Formatter:
    ac.SetFormatter(&accesslog.JSON{
        Indent:    "  ",
        HumanTime: true,
    })
    // ac.SetFormatter(&accesslog.CSV{})
    // ac.SetFormatter(&accesslog.Template{Text: "{{.Code}}"})

    return ac
}

func main() {
    ac := makeAccessLog()
    defer ac.Close() // Close the underline file.

    app := iris.New()
    // Register the middleware (UseRouter to catch http errors too).
    app.UseRouter(ac.Handler)

    app.Get("/", indexHandler)

    app.Listen(":8080")
}

func indexHandler(ctx iris.Context) {
    ctx.WriteString("OK")
}