add an accesslog simple example

_examples/logging/request-logger/accesslog-simple/main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"github.com/kataras/iris/v12"
+	"github.com/kataras/iris/v12/middleware/accesslog"
+)
+
+// Default line format:
+// Time|Latency|Code|Method|Path|IP|Path Params Query Fields|Bytes Received|Bytes Sent|Request|Response|
+//
+// Read the example and its comments carefully.
+func makeAccessLog() *accesslog.AccessLog {
+	// Initialize a new access log middleware.
+	ac := accesslog.File("./access.log")
+
+	// Defaults to true. Change to false for better performance.
+	ac.RequestBody = false
+	ac.ResponseBody = false
+	ac.BytesReceived = false
+	ac.BytesSent = false
+
+	// Defaults to false.
+	ac.Async = false
+
+	return ac
+}
+
+func main() {
+	ac := makeAccessLog()
+	defer ac.Close()
+
+	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")
+}