simplify some examples

_examples/file-server/single-page-application/basic/main.go

@@ -1,27 +1,15 @@
 package main
 
-import (
-	"github.com/kataras/iris/v12"
-)
-
-// same as embedded-single-page-application but without go-bindata, the files are "physical" stored in the
-// current system directory.
-
-var page = struct {
-	Title string
-}{"Welcome"}
+import "github.com/kataras/iris/v12"
 
 func newApp() *iris.Application {
 	app := iris.New()
-	app.RegisterView(iris.HTML("./public", ".html"))
 
-	app.Get("/", func(ctx iris.Context) {
-		ctx.ViewData("Page", page)
-		ctx.View("index.html")
+	app.HandleDir("/", iris.Dir("./public"), iris.DirOptions{
+		IndexName: "index.html",
+		SPA:       true,
 	})
 
-	app.HandleDir("/", iris.Dir("./public"))
-
 	return app
 }
 
@@ -29,8 +17,7 @@ func main() {
 	app := newApp()
 
 	// http://localhost:8080
-	// http://localhost:8080/index.html
-	// http://localhost:8080/app.js
-	// http://localhost:8080/css/main.css
+	// http://localhost:8080/about
+	// http://localhost:8080/a_notfound
 	app.Listen(":8080")
 }