Remove old cookie from client if provided

functions/_middleware.ts

@@ -41,6 +41,11 @@ async function setAuth(context: RequestContext) {
     );
 
     if (userData) context.data.current_user = JSON.parse(userData);
+    else
+      context.request.headers.append(
+        "set-cookie",
+        "_s=; HttpOnly; Max-Age=0; Path=/; Secure;"
+      );
 
     break;
   }