~~~ // Package main shows how you can use the `WriteWithExpiration` // based on the "modtime", if it's newer than the request header then // it will refresh the contents, otherwise will let the client (99.9% the browser) // to handle the cache mechanism, it's faster than iris.Cache because server-side // has nothing to do and no need to store the responses in the memory. package main import ( "time" "github.com/kataras/iris" ) const refreshEvery = 10 * time.Second func main() { app := iris.New() app.Use(iris.Cache304(refreshEvery)) // same as: // app.Use(func(ctx iris.Context) { // now := time.Now() // if modified, err := ctx.CheckIfModifiedSince(now.Add(-refresh)); !modified && err == nil { // ctx.WriteNotModified() // return // } // ctx.SetLastModified(now) // ctx.Next() // }) app.Get("/", greet) app.Run(iris.Addr(":8080")) } func greet(ctx iris.Context) { ctx.Header("X-Custom", "my custom header") ctx.Writef("Hello World! %s", time.Now()) } ~~~