Update tailwind.config.js and .air.toml, remove stylegen/package.json and modify base.css and main.go

main.go

@@ -1,6 +1,15 @@
 package main
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
 	"github.com/joho/godotenv"
 	"github.com/labstack/echo/v4"
 	"github.com/labstack/echo/v4/middleware"
@@ -16,6 +25,9 @@ func main() {
 	// Initialize Echo router
 	e := echo.New()
 
+	// Generate a unique version identifier
+	version := time.Now().Format(time.RFC3339)
+
 	// Middleware
 	e.Use(middleware.Logger())
 	e.Use(middleware.Recover())
@@ -27,6 +39,40 @@ func main() {
 		Level: 5,
 	}))
 	e.Use(middleware.RateLimiter(middleware.NewRateLimiterMemoryStore(50)))
+	// Use middleware to set ETag and Cache-Control headers
+	e.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			// Get the path of the requested resource
+			path := c.Request().URL.Path
+
+			// If the requested resource is a CSS file
+			if strings.HasSuffix(path, ".css") {
+				log.Println(path)
+				// Read the CSS file
+				data, err := os.ReadFile(filepath.Join("public", strings.TrimPrefix(path, "/public")))
+				if err != nil {
+					// Log the error and return a 500 status
+					log.Println(err)
+					return c.NoContent(http.StatusInternalServerError)
+				}
+
+				// Compute the hash of the CSS file contents
+				hash := sha256.Sum256(data)
+
+				// Set the ETag to the hash
+				c.Response().Header().Set("ETag", hex.EncodeToString(hash[:]))
+
+				// Set the Content-Type to text/css
+				c.Response().Header().Set("Content-Type", "text/css")
+			} else {
+				// For other resources, set the ETag to the server start time
+				c.Response().Header().Set("ETag", version)
+			}
+
+			c.Response().Header().Set("Cache-Control", "public, no-cache")
+			return next(c)
+		}
+	})
 
 	// Static server
 	e.Static("/public", "public")
@@ -43,6 +89,11 @@ func main() {
 	apiGroup.GET("/sse", api.SSE)
 	apiGroup.POST("/sendsse", api.SSEDemoSend)
 
-	// Start server
-	e.Logger.Fatal(e.Start(":3000"))
+	// Start server with HTTP/2 support
+	s := &http.Server{
+		Addr:    ":3000",
+		Handler: e,
+	}
+	e.Logger.Fatal(e.StartServer(s))
+	log.Println("Server started on port 3000")
 }