Fasthttp + fasthttprouter, trying to write middleware

I'm currently trying to write some middleware to work with fasthttp and fasthttprouter. And I'm stuck.

func jwt(h fasthttprouter.Handle) fasthttprouter.Handle {
myfunc := func(ctx *fasthttp.RequestCtx, _ fasthttprouter.Params) {
    fmt.Println(string(ctx.Request.Header.Cookie("Authorization")))
}

return myfunc
}

How do I run the actual handler now? I feel like i'm missing something very simple.

I've read through this blog post: Middleware in Golang. But i'm lost.

Any ideas?

Regards

for example, let us create a middleware function that will handle CORS using:

github.com/buaazp/fasthttprouter and github.com/valyala/fasthttp

var (
    corsAllowHeaders     = "authorization"
    corsAllowMethods     = "HEAD,GET,POST,PUT,DELETE,OPTIONS"
    corsAllowOrigin      = "*"
    corsAllowCredentials = "true"
)

func CORS(next fasthttp.RequestHandler) fasthttp.RequestHandler {
    return func(ctx *fasthttp.RequestCtx) {

        ctx.Response.Header.Set("Access-Control-Allow-Credentials", corsAllowCredentials)
        ctx.Response.Header.Set("Access-Control-Allow-Headers", corsAllowHeaders)
        ctx.Response.Header.Set("Access-Control-Allow-Methods", corsAllowMethods)
        ctx.Response.Header.Set("Access-Control-Allow-Origin", corsAllowOrigin)

        next(ctx)
    }
}

Now we chain this middleware function on our Index handler and register it on the router.

func Index(ctx *fasthttp.RequestCtx) {
    fmt.Fprint(ctx, "some-api")
}

func main() {
    router := fasthttprouter.New()
    router.GET("/", Index)

    if err := fasthttp.ListenAndServe(":8181", CORS(router.Handler)); err != nil {
        log.Fatalf("Error in ListenAndServe: %s", err)
    }
}