Security Headers Quick Reference

HTTP security headers are high-impact, low-effort controls. Essential headers include CSP, HSTS, X-Content-Type-Options, and X-Frame-Options.

Security PostureSPHSecurityBeginnerCUI2,060 words9 min readApr 1, 2026

Last updated Apr 11, 2026Currentv2

CLASSIFICATION: CUI

This article requires CUI clearance or higher.

What you need

Create a free Nexus ID to access CDA proprietary content including PDM domain explainers, methodology deep-dives, and reconnaissance mission briefings.

Create Nexus ID (Free)

Also at this clearance level

DPSDataIntermediateCUI

Table of Contents

Security Headers Quick Reference

What you need

Also at this clearance level

Data Protection and Sovereignty (DPS): The Geological Core

Vulnerability and Surface Defense (VSD): The Oceans

Security for Manufacturing

Security for SaaS Companies

The Academy

The Command Post

The Armory