Gin Go

package main

import (
	"encoding/base64"
	"net/http"

	"github.com/gin-gonic/gin"
)

var gif, _ = base64.StdEncoding.DecodeString("R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==")

func main() {
	r := gin.Default()
	r.GET("/pixel.gif", func(c *gin.Context) {
		c.Header("Cache-Control", "no-store")
		c.Data(http.StatusOK, "image/gif", gif)
	})
	r.Run(":8080")
}