Reference of 11 HTTP security headers: risks and codes

Web application security begins with configuring HTTP headers, a high-return-on-investment practice that significantly reduces the attack surface. At Q2BSTUDIO, when developing custom applications, we prioritize the implementation of these 11 critical headers. Among the most relevant are Strict-Transport-Security, which forces HTTPS connections and prevents downgrade attacks; Content-Security-Policy, which mitigates XSS injection by defining allowed origins; and X-Frame-Options, which prevents clickjacking by restricting inclusion in frames. Also consider X-Content-Type-Options (disabling MIME sniffing), Referrer-Policy (controlling information leakage), and the Cross-Origin trio (COEP, COOP, CORP) to protect against side-channel attacks like Spectre. Practical implementation varies by technology: in Node.js you can use Helmet, while in nginx you add add_header directives. From our experience offering cybersecurity services, we recommend starting with the four low-risk headers with no side effects: X-Content-Type-Options, X-Frame-Options, Referrer-Policy, and HSTS. Then, dedicate time to adjusting CSP in report-only mode. Our teams also integrate these headers into cloud deployments (AWS and Azure cloud services) and artificial intelligence solutions, ensuring that both AI agents and Power BI dashboards meet the most demanding standards. Cybersecurity is a cross-cutting pillar in every custom software we build, and these headers are the first line of defense.