add http timeout example

_examples/README.md

@@ -29,6 +29,7 @@
         * [Use Iris as a single http.Handler](http-server/custom-httpserver/std-way/main.go)
         * [Multi Instances](http-server/custom-httpserver/multi/main.go)
         * [HTTP/3 Quic](http-server/http3-quic)
+    * [Timeout](http-server/timeout/main.go)
 * Configuration
     * [Functional](configuration/functional/main.go)
     * [Configuration Struct](configuration/from-configuration-structure/main.go)

_examples/http-server/timeout/main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"context"
+	"time"
+
+	"github.com/kataras/iris/v12"
+)
+
+func main() {
+	app := iris.New()
+
+	app.Get("/test", func(ctx iris.Context) {
+		w := new(worker)
+		result := w.Work(ctx)
+		ctx.WriteString(result)
+	})
+
+	app.Listen(":8080", iris.WithTimeout(4*time.Second))
+}
+
+type worker struct{}
+
+func (w *worker) Work(ctx context.Context) string {
+	t := time.Tick(time.Second)
+	times := 0
+	for {
+		select {
+		case <-ctx.Done():
+			println("context.Done: canceled")
+			return "Work canceled"
+		case <-t:
+			times++
+			println("Doing some work...")
+
+			if times > 5 {
+				return "Work is done with success"
+			}
+		}
+	}
+
+	return "nothing to do here"
+}

configuration.go

@@ -209,10 +209,12 @@ func WithKeepAlive(keepAliveDur time.Duration) Configurator {
 }
 
 // WithTimeout sets the `Configuration.Timeout` field to the given duration.
-func WithTimeout(timeoutDur time.Duration, htmlBody string) Configurator {
+func WithTimeout(timeoutDur time.Duration, htmlBody ...string) Configurator {
 	return func(app *Application) {
 		app.config.Timeout = timeoutDur
-		app.config.TimeoutMessage = htmlBody
+		if len(htmlBody) > 0 {
+			app.config.TimeoutMessage = htmlBody[0]
+		}
 	}
 }
 

iris.go

@@ -643,6 +643,24 @@ func (app *Application) Build() error {
 
 		if app.config.Timeout > 0 {
 			app.Router.SetTimeoutHandler(app.config.Timeout, app.config.TimeoutMessage)
+
+			app.ConfigureHost(func(su *Supervisor) {
+				if su.Server.ReadHeaderTimeout == 0 {
+					su.Server.ReadHeaderTimeout = app.config.Timeout + 5*time.Second
+				}
+
+				if su.Server.ReadTimeout == 0 {
+					su.Server.ReadTimeout = app.config.Timeout + 10*time.Second
+				}
+
+				if su.Server.WriteTimeout == 0 {
+					su.Server.WriteTimeout = app.config.Timeout + 15*time.Second
+				}
+
+				if su.Server.IdleTimeout == 0 {
+					su.Server.IdleTimeout = app.config.Timeout + 25*time.Second
+				}
+			})
 		}
 
 		// re-build of the router from outside can be done with