Custom not found

Lightning Framework provides an easy way to customize the 404 error functionality by modifying the NotFoundHandler. For example:

package main

import (
    "net/http"

    "github.com/go-labx/lightning"
)

func main() {
    app := lightning.NewApp(&lightning.Config{
        NotFoundHandler: func(ctx *lightning.Context) {
            ctx.Text(404, "custom not found")
        },
    })

    app.Get("/ping", func(ctx *lightning.Context) {
        ctx.JSON(http.StatusOK, map[string]string{
            "message": "pong",
        })
    })

    app.Run()
}

In the above code, when a user tries to access an API that doesn't exist, the NotFoundHandler will handle the error and return a text response with a 404 error code and a message indicating the API endpoint that was not found.

To customize this functionality, we can also modify the NotFoundHandler to return a different response or redirect the user to a custom error page.

For example, we could modify the NotFoundHandler to redirect the user to a custom 404 error page as follows:

app := lightning.NewApp(&lightning.Config{
    NotFoundHandler: func(ctx *lightning.Context) {
        ctx.Redirect(http.StatusMovedPermanently, "/404")
    },
})

This code will redirect the user to a custom 404 error page at the /404 endpoint.

Overall, the NotFoundHandler provides a simple way to customize the 404 error functionality in the Lightning Framework.