Caching assets with HTTP cache headers

You can also manage caching with the Gin framework. To illustrate this, write a simple web application to serve an image. The code is as follows:

func IllustrationHandler(c *gin.Context) {
   c.File("illustration.png")
}
func main() {
   router := gin.Default()
   router.GET("/illustration", IllustrationHandler)
   router.Run(":3000")
}

The application should serve an image when the user hits the /illustration resource URL:

Figure 6.37 – Serving an image with Gin

Because the same image is always delivered, we need to make sure that we're caching the image. That way, we can avoid having unnecessary traffic and have better web performance. Let's see how that is done.

Setting HTTP caching headers

To cache this HTTP request, you can attach an entity tag (ETag) to the HTTP response header. When a user sends...