gofiber/fiber v2.40.0

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// now you can add your own custom methods
app := fiber.New(fiber.Config{
    RequestMethods: append(fiber.DefaultMethods, "LOAD", "TEST"),
})

app.Add("LOAD", "/hello", func(c *fiber.Ctx) error {
    return c.SendString("Hello, World 👋!")
})

// declaration of multiple paths for the ".Use" method as in express is now possible
app.Use([]string{"/john", "/doe"}, func(c *Ctx) error {
    return c.SendString(c.Path())
})

app.Get("/:userId<int>?", func(c *fiber.Ctx) error {
    return c.SendString(c.Params("userId"))
})
// curl -X GET http://localhost:3000/42
// 42

// curl -X GET http://localhost:3000/
//

app := fiber.New()
micro := fiber.New()
// order when registering the mounted apps no longer plays a role
app.Mount("/john", micro)
// before there was problem when after mounting routes were registered
micro.Get("/doe", func(c *fiber.Ctx) error {
    return c.SendStatus(fiber.StatusOK)
})

// output of the mount path possible
micro.MountPath()   // "/john"

// In systems where you have multiple ingress endpoints, it is common to add a URL prefix, like so:
app.Use(pprof.New(pprof.Config{Prefix: "/endpoint-prefix"}))

app.Use(logger.New(logger.Config{
    Format: "[${time}] ${status} - ${latency} ${method} ${randomNumber} ${path}\n",
    CustomTags: map[string]logger.LogFunc{
        // possibility to adapt or overwrite existing tags
        logger.TagMethod: func(output logger.Buffer, c *fiber.Ctx, data *logger.Data, extraParam string) (int, error) {
            return output.WriteString(utils.ToLower(c.Method()))
        },
        // own tags can be registered
        "randomNumber": func(output logger.Buffer, c *fiber.Ctx, data *logger.Data, extraParam string) (int, error) {
            return output.WriteString(strconv.FormatInt(rand.Int63n(100), 10))
        },
    },
}))
// [17:15:17] 200 -      0s get 10 /test
// [17:15:17] 200 -      0s get 51 /test

app.Use(logger.New(logger.Config{
    // is triggered when the handlers has been processed
    Done: func(c *fiber.Ctx, logString []byte) {
        // allows saving the logging string to other sources
        if c.Response().StatusCode() != fiber.StatusOK {
            reporter.SendToSlack(logString) 
        }
    },
}))