Goroutines inside a middleware

When starting new Goroutines inside a middleware or handler, you SHOULD NOT use the original context inside it, you have to use a read-only copy.

func main() {
    app := iris.Default()

    app.Get("/long_async", func(ctx iris.Context) {
        // create a clone to be used inside the goroutine
        ctxCopy := ctx.Clone()
        go func() {
            // simulate a long task with time.Sleep(). 5 seconds
            time.Sleep(5 * time.Second)

            // note that you are using the copied context "ctxCopy", IMPORTANT
            log.Printf("Done! in path: %s", ctxCopy.Path())
        }()
    })

    app.Get("/long_sync", func(ctx iris.Context) {
        // simulate a long task with time.Sleep(). 5 seconds
        time.Sleep(5 * time.Second)

        // since we are NOT using a goroutine, we do not have to copy the context
        log.Printf("Done! in path: %s", ctx.Path())
    })

    app.Listen(":8080")
}