diff --git a/internal/server/static_delivery.go b/internal/server/static_delivery.go
index 216b7314..a6dbc25a 100644
--- a/internal/server/static_delivery.go
+++ b/internal/server/static_delivery.go
@@ -1,7 +1,9 @@
 package server
 
 import (
+	"mime"
 	"net/http"
+	"path/filepath"
 	"strings"
 )
 
@@ -16,3 +18,41 @@ func addVary(header http.Header, value string) {
 	}
 	header.Add("Vary", value)
 }
+
+//nolint:unused
+func isCompressibleContentType(value string) bool {
+	mediaType, _, err := mime.ParseMediaType(value)
+	if err != nil {
+		mediaType = strings.TrimSpace(strings.Split(value, ";")[0])
+	}
+	mediaType = strings.ToLower(mediaType)
+	if strings.HasPrefix(mediaType, "text/") || strings.HasSuffix(mediaType, "+json") || strings.HasSuffix(mediaType, "+xml") {
+		return true
+	}
+	switch mediaType {
+	case "application/javascript", "application/json", "application/manifest+json", "application/x-javascript", "application/xhtml+xml", "application/xml", "image/svg+xml":
+		return true
+	default:
+		return false
+	}
+}
+
+//nolint:unused
+func isCompressedPath(path string) bool {
+	switch strings.ToLower(filepath.Ext(path)) {
+	case ".7z", ".avif", ".br", ".gif", ".gz", ".ico", ".jpeg", ".jpg", ".m4a", ".m4v", ".mov", ".mp3", ".mp4", ".oga", ".ogg", ".ogv", ".pdf", ".png", ".rar", ".webm", ".webp", ".woff", ".woff2", ".zip":
+		return true
+	default:
+		return false
+	}
+}
+
+//nolint:unused
+func isImagePath(path string) bool {
+	switch strings.ToLower(filepath.Ext(path)) {
+	case ".avif", ".gif", ".ico", ".jpeg", ".jpg", ".png", ".svg", ".webp":
+		return true
+	default:
+		return false
+	}
+}