Guides on security headers, TLS configuration, Content Security Policy, and more.
Controls which resources can be loaded and executed on your website.
Content-Security-Policy: default-src 'self'; scrip...Forces browsers to use HTTPS connections only, preventing downgrade attacks.
Strict-Transport-Security: max-age=31536000; inclu...Controls whether your website can be embedded in frames or iframes.
X-Frame-Options: SAMEORIGINPrevents browsers from MIME-sniffing content types.
X-Content-Type-Options: nosniffControls how much referrer information is sent with requests.
Referrer-Policy: strict-origin-when-cross-originControls which browser features and APIs can be used.
Permissions-Policy: geolocation=(), camera=(), mic...Prevents cross-origin data leakage and enables advanced web features.
Cross-Origin-Embedder-Policy: require-corpPrevents cross-origin window manipulation and popup attacks.
Cross-Origin-Opener-Policy: same-originControls which origins can load your website's resources.
Cross-Origin-Resource-Policy: same-originControls cross-domain policy file access for legacy plugins.
X-Permitted-Cross-Domain-Policies: nonePrevents Internet Explorer from automatically downloading files.
X-Download-Options: noopenControls DNS prefetching behavior in browsers.
X-DNS-Prefetch-Control: offControls whether the page runs in its own origin agent cluster.
Origin-Agent-Cluster: ?1Clears browser data for your website when specified.
Clear-Site-Data: "cache", "cookies", "storage"Upgrades HTTP requests to HTTPS automatically.
Upgrade-Insecure-Requests: 1Securing cookies with HttpOnly, Secure, and SameSite attributes.
Set-Cookie: sessionId=abc123; HttpOnly; Secure; Sa...Cross-Origin policies, information disclosure prevention, and best practices.
Certificate validation, cipher suites, forward secrecy, and testing methods.
Directive parsing, common issues, auditing techniques, and recommendations.
How COEP, COOP, and CORP protect against Spectre and enable powerful APIs.
Prevent HTTP headers from revealing server details to attackers.
TLS 1.2 and 1.3 handshakes, cipher negotiation, and forward secrecy.
Find and fix HTTP resources on HTTPS pages to maintain security.
SPF, DMARC, DKIM for email auth, CAA records, and DNSSEC validation.
RFC 9116 fields, deployment steps, and vulnerability disclosure setup.
Nonces, strict-dynamic, CSS-in-JS, and common pitfalls for React apps.
Configure report-uri and report-to, filter extension noise, and monitor CSP violations in production.
Deploy CSP on WordPress with plugins, themes, and WooCommerce support.
Allowlist reference for Google Analytics, Stripe, PayPal, HubSpot, and more.
How HSTS prevents SSL stripping, 307 internal redirects, and preload lists.
Replace unsafe-inline with nonces, hashes, and strict-dynamic for real XSS protection.
HttpOnly, Secure, SameSite explained with session hijacking and CSRF prevention.
What security headers are, why they matter, and the fastest way to check any site.
Five common reasons headers go missing or stay ineffective, and how to diagnose each one.
Headers vanish after deploys. Certs expire. Why a one-time scan is not enough and what monitoring catches.
Set up daily automated scans, understand change detection, and read your email digest.
What your security headers score means, which factors affect it, and how to improve it.
Complete reference with copy-paste configurations for Apache, Nginx, and Node.js.
Side by side comparison of free security header scanners for 2026.
Defense in depth explained. Six concentric rings from session identity to monitoring, and what breaks when each one fails.
Seven layers every site owner should verify, from TLS and headers to cookies and DNS.
Implement security headers, harden TLS, deploy a WAF, lock down cookies, and set up monitoring.
How HTTP hops expose cookies, enable SSL stripping, and block HSTS preload eligibility.
Protect your site from compromised CDNs by verifying external scripts and stylesheets with integrity hashes.
HTTPS encrypts the connection. HSTS makes sure the browser never skips it. Why you need both.
Create a Content Security Policy from scratch with walkthroughs for common site types.
Configure HSTS headers correctly with preload enrollment and incremental rollout.
Control browser feature access with Permissions Policy for privacy and compliance.
Configure CORS safely, understand preflight requests, and debug cross-origin errors.
Scan your site and see which security headers are missing.