Response XLSX data

response_xlsx.go

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"

	"github.com/gofiber/fiber/v2"
)

func main() {
	app := fiber.New()

	app.Post("/xlsx", func(c *fiber.Ctx) error {
		fileBytes, err := ioutil.ReadFile("Excel.xlsx")
		if err != nil {
			panic(err)
		}

		c.Response().Header.Set("Content-Type", "application/octet-stream")
		c.Response().Header.Set("Content-Disposition", "attachment; filename=workbook.xlsx")
		c.Response().Header.Set("Content-Transfer-Encoding", "binary")
		c.Response().Header.Set("Content-Length", fmt.Sprintf("%d", len(fileBytes)))
		c.Response().Header.Set("Expires", "0")
		c.Response().BodyWriter().Write(fileBytes)

		return c.SendStatus(http.StatusOK)
	})

	log.Fatal(app.Listen(":3000"))
}