Refactor

main.go

@@ -6,6 +6,8 @@ import (
 	"io"
 	"log"
 	"net/http"
+	"path/filepath"
+	"regexp"
 	"strings"
 
 	"github.com/joho/godotenv"
@@ -19,6 +21,8 @@ type gzipResponseWriter struct {
 	http.ResponseWriter
 }
 
+var fingerprintPattern = regexp.MustCompile(`[-.][a-f0-9]{8,}\.`)
+
 func (w gzipResponseWriter) Write(b []byte) (int, error) {
 	return w.Writer.Write(b)
 }
@@ -43,7 +47,11 @@ func gzipMiddleware(next http.Handler) http.Handler {
 
 func cacheMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("Cache-Control", "public, max-age=31536000")
+		if fingerprintPattern.MatchString(filepath.Base(r.URL.Path)) {
+			w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
+		} else {
+			w.Header().Set("Cache-Control", "public, max-age=3600")
+		}
 		next.ServeHTTP(w, r)
 	})
 }