fix: headers are immutable

Since when‽

Author: lishaduck

.gitignore

@@ -4,6 +4,9 @@
 # Testing
 /packages/*/test/.test_optimizer.dart
 
+# Serve data
+/packages/*/static/
+
 # Miscellaneous
 *.class
 *.log

packages/server/src/server.ts

@@ -4,11 +4,12 @@ export async function respond(req: Request, dir = "static"): Promise<Response> {
   const res = await serveDir(req, {
     fsRoot: dir,
     enableCors: true,
+    headers: [
+      "Cross-Origin-Opener-Policy:same-origin",
+      "Cross-Origin-Embedder-Policy:require-corp",
+    ],
   });
 
-  res.headers.set("Cross-Origin-Opener-Policy", "same-origin");
-  res.headers.set("Cross-Origin-Embedder-Policy", " require-corp");
-
   return res;
 }