Update site visuals and assets

server.js

@@ -16,6 +16,7 @@ const path = require("path");
 const crypto = require("crypto");
 const os = require("os");
 const net = require("net");
+const zlib = require("zlib");
 
 const ROOT = __dirname;
 const PUBLIC_DIR = path.join(ROOT, "public");
@@ -65,6 +66,7 @@ const MIME = {
   ".png": "image/png",
   ".jpg": "image/jpeg",
   ".jpeg": "image/jpeg",
+  ".webp": "image/webp",
   ".ico": "image/x-icon",
   ".json": "application/json; charset=utf-8",
   ".woff2": "font/woff2"
@@ -77,11 +79,35 @@ const CLEAN_ROUTES = {
   "/datenschutz": "/datenschutz.html"
 };
 
+const IMMUTABLE_EXTS = new Set([".webp", ".svg", ".woff2", ".png", ".jpg", ".jpeg", ".ico"]);
+const COMPRESSIBLE_EXTS = new Set([".html", ".css", ".js", ".svg", ".json", ".txt"]);
+
 function redirect(res, location) {
   res.writeHead(308, { Location: location });
   res.end();
 }
 
+function cacheControlFor(urlPath, ext, cacheKey) {
+  if (urlPath.startsWith("/gamejam-games/")) return "public, max-age=60";
+  if (ext === ".html") return "no-cache";
+  if (ext === ".css" || ext === ".js") {
+    return cacheKey ? "public, max-age=31536000, immutable" : "no-cache";
+  }
+  if (IMMUTABLE_EXTS.has(ext)) return "public, max-age=31536000, immutable";
+  return "no-cache";
+}
+
+function etagFor(stat) {
+  return 'W/"' + stat.size.toString(16) + "-" + Math.floor(stat.mtimeMs).toString(16) + '"';
+}
+
+function preferredEncoding(req) {
+  const accepted = req.headers["accept-encoding"] || "";
+  if (/\bbr\b/.test(accepted)) return "br";
+  if (/\bgzip\b/.test(accepted)) return "gzip";
+  return null;
+}
+
 /* ---------- Lead-Speicher vorbereiten ---------- */
 function ensureLeadStore() {
   if (!fs.existsSync(LEADS_DIR)) fs.mkdirSync(LEADS_DIR, { recursive: true });
@@ -163,11 +189,35 @@ function serveStatic(req, res) {
       return;
     }
     const ext = path.extname(filePath).toLowerCase();
-    res.writeHead(200, {
+    const etag = etagFor(stat);
+    const headers = {
       "Content-Type": MIME[ext] || "application/octet-stream",
-      "Cache-Control": "no-cache"
-    });
-    fs.createReadStream(filePath).pipe(res);
+      "Cache-Control": cacheControlFor(urlPath, ext, parsedUrl.search),
+      "ETag": etag,
+      "Last-Modified": stat.mtime.toUTCString(),
+      "X-Content-Type-Options": "nosniff"
+    };
+
+    if (COMPRESSIBLE_EXTS.has(ext)) headers["Vary"] = "Accept-Encoding";
+
+    if ((req.headers["if-none-match"] || "").includes(etag)) {
+      res.writeHead(304, headers);
+      res.end();
+      return;
+    }
+
+    let stream = fs.createReadStream(filePath);
+    const encoding = COMPRESSIBLE_EXTS.has(ext) ? preferredEncoding(req) : null;
+    if (encoding === "br") {
+      headers["Content-Encoding"] = "br";
+      stream = stream.pipe(zlib.createBrotliCompress());
+    } else if (encoding === "gzip") {
+      headers["Content-Encoding"] = "gzip";
+      stream = stream.pipe(zlib.createGzip({ level: 6 }));
+    }
+
+    res.writeHead(200, headers);
+    stream.pipe(res);
   });
 }