CyberGuard dictionary / Web Application Security
HTTP Security Headers
HTTP security headers are response fields that tell browsers how to apply selected protections when handling a page.
In simple terms
A website can instruct browsers to use HTTPS, limit framing, and restrict where page content may load from.
Technical explanation
Examples include Strict-Transport-Security, Content-Security-Policy, and Referrer-Policy; frame-ancestors or X-Frame-Options can limit framing. Headers require correct configuration and complement server-side authentication, authorization, and input handling.
Each header addresses a specific browser behavior rather than providing general immunity. Teams should test policy interactions, report violations, and keep server-side checks intact.
Examples in practice
A site sets a frame-ancestors policy so an unrelated website cannot embed its account settings page.
The site adds HSTS and a frame restriction, then checks that legitimate embedded workflows still function. A browser test catches a policy that would have broken the support portal.
Why it matters
Well-chosen headers reduce the impact of several browser-based attacks and accidental data exposure.
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Sources and further reading
Published 2026-10-15 · Last updated 2026-10-15 · CyberGuard editorial content. Source links provide context; they do not imply endorsement.