Routing middleware

package main

import "github.com/kataras/iris/v12"

func main() {
    app := iris.New()
    // or app.Use(before) and app.Done(after).
    app.Get("/", before, mainHandler, after)
    app.Listen(":8080")
}

func before(ctx iris.Context) {
    shareInformation := "this is a sharable information between handlers"

    requestPath := ctx.Path()
    println("Before the mainHandler: " + requestPath)

    ctx.Values().Set("info", shareInformation)
    ctx.Next() // execute the next handler, in this case the main one.
}

func after(ctx iris.Context) {
    println("After the mainHandler")
}

func mainHandler(ctx iris.Context) {
    println("Inside mainHandler")

    // take the info from the "before" handler.
    info := ctx.Values().GetString("info")

    // write something to the client as a response.
    ctx.HTML("<h1>Response</h1>")
    ctx.HTML("<br/> Info: " + info)

    ctx.Next() // execute the "after".
}
https://github.com/kataras/iris/wiki/Routing-middleware

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