chore: upgrade to Go 1.23.3 and fix MIME types

- Update go.mod to Go 1.23.3
- Add explicit MIME type handling for static files

cmd/server/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"net/http"
+	"path/filepath"
 
 	"github.com/a-h/templ"
 	"github.com/axzilla/goilerplate/assets"
@@ -49,23 +50,41 @@ func main() {
 func SetupAssetsRoutes(mux *http.ServeMux) {
 	var isDevelopment = config.AppConfig.GoEnv != "production"
 
-	// We need this for Templ to work
-	disableCacheInDevMode := func(next http.Handler) http.Handler {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			if isDevelopment {
-				w.Header().Set("Cache-Control", "no-store")
-			}
-			next.ServeHTTP(w, r)
-		})
+	mimeTypes := map[string]string{
+		".css":   "text/css; charset=utf-8",
+		".js":    "application/javascript; charset=utf-8",
+		".svg":   "image/svg+xml",
+		".html":  "text/html; charset=utf-8",
+		".jpg":   "image/jpeg",
+		".jpeg":  "image/jpeg",
+		".png":   "image/png",
+		".gif":   "image/gif",
+		".woff":  "font/woff",
+		".woff2": "font/woff2",
+		".ttf":   "font/ttf",
+		".ico":   "image/x-icon",
 	}
 
-	// Serve static files from the assets directory
-	var fs http.Handler
-	if isDevelopment {
-		fs = http.FileServer(http.Dir("./assets"))
-	} else {
-		fs = http.FileServer(http.FS(assets.Assets))
-	}
+	assetHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ext := filepath.Ext(r.URL.Path)
 
-	mux.Handle("GET /assets/*", disableCacheInDevMode(http.StripPrefix("/assets/", fs)))
+		if mimeType, ok := mimeTypes[ext]; ok {
+			w.Header().Set("Content-Type", mimeType)
+		}
+
+		if isDevelopment {
+			w.Header().Set("Cache-Control", "no-store")
+		}
+
+		var fs http.Handler
+		if isDevelopment {
+			fs = http.FileServer(http.Dir("./assets"))
+		} else {
+			fs = http.FileServer(http.FS(assets.Assets))
+		}
+
+		fs.ServeHTTP(w, r)
+	})
+
+	mux.Handle("GET /assets/", http.StripPrefix("/assets/", assetHandler))
 }

go.mod

@@ -1,6 +1,6 @@
 module github.com/axzilla/goilerplate
 
-go 1.22.4
+go 1.23.3
 
 require (
 	github.com/Oudwins/tailwind-merge-go v0.2.0