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Security Intermediate

What is Security Headers?

HTTP response headers that instruct browsers to enable security features like XSS protection, framing prevention, and content type enforcement.

Essential security headers include Content-Security-Policy (control resource loading), X-Frame-Options (prevent clickjacking), X-Content-Type-Options: nosniff (prevent MIME sniffing), Strict-Transport-Security (force HTTPS), and Referrer-Policy (control referrer information).

Additional headers include Permissions-Policy (restrict browser features), X-XSS-Protection (legacy XSS filter), and Cross-Origin headers (CORP, COEP, COOP). Security headers are a crucial defense layer that requires no code changes — just server configuration.

Related Terms

XSS (Cross-Site Scripting)
An attack that injects malicious scripts into web pages viewed by other users, potentially stealing data or session tokens.
Rate Limiting
A technique that controls the number of requests a client can make to a server within a specified time period.
Firewall Rules
Configuration entries that define which network traffic is allowed or blocked based on source, destination, port, and protocol.
Phishing
A social engineering attack that uses fraudulent communications to trick people into revealing sensitive information or installing malware.
Supply Chain Attack
A cyberattack that targets less-secure elements in the software supply chain to compromise downstream users and organizations.
OAuth 2.0
An authorization framework that allows third-party applications to access user resources without sharing passwords.
 View All Security Terms →