ETag!

main.go

@@ -7,6 +7,8 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"path/filepath"
+	"time"
 
 	"github.com/joho/godotenv"
 	"github.com/labstack/echo/v4"
@@ -58,10 +60,30 @@ func main() {
 	}))
 	e.Use(middleware.RateLimiter(middleware.NewRateLimiterMemoryStore(50)))
 
+	// Generate the deployment time when the application starts
+	deploymentTime := fmt.Sprintf("%d", time.Now().UnixNano())
+
 	// Static server
 	fs := http.FS(PublicFS)
 	e.GET("/public/*", func(c echo.Context) error {
+		// Generate an ETag based on the deployment time
+		eTag := fmt.Sprintf(`W/"%s"`, deploymentTime)
+
+		// Set the ETag header
+		c.Response().Header().Set("ETag", eTag)
+
+		// Set the Cache-Control header
 		c.Response().Header().Set("Cache-Control", "public, max-age=3600")
+
+		// Check the file extension and set the Content-Type header accordingly
+		ext := filepath.Ext(c.Param("*"))
+		switch ext {
+		case ".css":
+			c.Response().Header().Set("Content-Type", "text/css; charset=utf-8")
+		case ".js":
+			c.Response().Header().Set("Content-Type", "application/javascript; charset=utf-8")
+		}
+
 		return echo.WrapHandler(http.FileServer(fs))(c)
 	})