New DirOptions.Cache field for in-memory caching and pre-compression for the fastest possible static file server

Read HISTORY.md it contains a breaking change, second parameter of HandleDir should be iris.Dir(...) instead of just a string

relative to: https://github.com/kataras/iris/issues/1556#issuecomment-661057446


Former-commit-id: 14b48a06fb3b99287dff543932be2937a64233b9

_examples/websocket/basic/server.go

@@ -114,7 +114,7 @@ func main() {
 	})
 
 	// serves the npm browser websocket client usage example.
-	app.HandleDir("/browserify", "./browserify")
+	app.HandleDir("/browserify", iris.Dir("./browserify"))
 
 	app.Listen(":8080")
 }

_examples/websocket/native-messages/main.go

@@ -42,7 +42,7 @@ func main() {
 		log.Printf("[%s] Disconnected from server", c.ID())
 	}
 
-	app.HandleDir("/js", "./static/js") // serve our custom javascript code.
+	app.HandleDir("/js", iris.Dir("./static/js")) // serve our custom javascript code.
 
 	// register the server on an endpoint.
 	// see the inline javascript code i the websockets.html, this endpoint is used to connect to the server.

_examples/websocket/online-visitors/main.go

@@ -29,7 +29,7 @@ func main() {
 	app.Get("/my_endpoint", websocket.Handler(ws))
 
 	// register static assets request path and system directory
-	app.HandleDir("/js", "./static/assets/js")
+	app.HandleDir("/js", iris.Dir("./static/assets/js"))
 
 	h := func(ctx iris.Context) {
 		ctx.ViewData("", page{PageID: "index page"})

_examples/websocket/socketio/main.go

@@ -46,7 +46,7 @@ func main() {
 	defer server.Close()
 
 	app.HandleMany("GET POST", "/socket.io/{any:path}", iris.FromStd(server))
-	app.HandleDir("/", "./asset")
+	app.HandleDir("/", iris.Dir("./asset"))
 
 	app.Listen(":8000", iris.WithoutPathCorrection)
 }