Add Security Headers

How can you add security headers in WordPress? This use case shows how a focused WordPress code snippet can handle the task without installing a heavy plugin. The snippet should add basic security headers to WordPress responses and produce this result: Frontend responses include headers like X-Frame-Options and X-Content-Type-Options. You can also log in to LeonLab.ai, describe this WordPress use case in plain English, generate the snippet, review the PHP code, and deploy it to the selected WordPress project.