I need to get headers from different web pages by using node technology and more specifically express, so I've seen printing the req.headers (using the req module) they get all. But the doubt comes in that by checking what returns to me there are some that do not appear. In this case with the web www.google.com, there are headers that do not appear and that I know you have such as X-XSS-Protection or X-Frame-Options How can I solve this?