add two new examples and share the app's specific logger instance with sessions databases and APIBuilder

_examples/routing/subdomains/www/www-method/main.go

@@ -0,0 +1,51 @@
+package main
+
+import "github.com/kataras/iris/v12"
+
+func newApp() *iris.Application {
+	app := iris.New()
+	// This will create a new "www" subdomain
+	// and redirect root-level domain requests
+	// to that one:
+	www := app.WWW()
+	www.Get("/", info)
+	www.Get("/about", info)
+	www.Get("/contact", info)
+
+	www.PartyFunc("/api/users", func(r iris.Party) {
+		r.Get("/", info)
+		r.Get("/{id:uint64}", info)
+
+		r.Post("/", info)
+
+		r.Put("/{id:uint64}", info)
+	})
+
+	return app
+}
+
+func main() {
+	app := newApp()
+	// http://mydomain.com
+	// http://mydomain.com/about
+	// http://imydomain.com/contact
+	// http://mydomain.com/api/users
+	// http://mydomain.com/api/users/42
+
+	// http://www.mydomain.com
+	// http://www.mydomain.com/hi
+	// http://www.mydomain.com/about
+	// http://www.mydomain.com/contact
+	// http://www.mydomain.com/api/users
+	// http://www.mydomain.com/api/users/42
+	app.Listen("mydomain.com:80")
+}
+
+func info(ctx iris.Context) {
+	method := ctx.Method()
+	subdomain := ctx.Subdomain()
+	path := ctx.Path()
+
+	ctx.Writef("\nInfo\n\n")
+	ctx.Writef("Method: %s\nSubdomain: %s\nPath: %s", method, subdomain, path)
+}