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Web server security – many web servers still set legacy HTTP response headers since old guides recommend to set these headers.

We added a new section to part 3 of our Web server security series that describes these headers in detail:

infosec-handbook.eu/blog/wss3-

Don't blindly set X-Frame-Options, X-Xss-Protection, or HPKP. You likely don't need to set them.

@infosechandbook
Regarding your recommendation to skip legacy headers, is there any downside to sending these headers aside from just sending extra bytes?

My worry is that some 'strange' browsers — the ones included in smart TVs and ereaders and other edge cases — have bolted on support for TLS 1.2 but have less modern behaviour in other aspects of how they render a page.

@jeffalyanak

There shouldn't be any downsides.

The biggest problem is the false sense of security: Server admins set these headers because there are mentioned by some old guides on the internet while every modern web browser ignores these headers.

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