ZeriFlow Journal
Actionable articles on TLS, headers, CSP, privacy, and practical hardening for modern web apps.
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The Permissions-Policy header gives you fine-grained control over which browser APIs your pages and embedded content can access. It replaced the deprecated Feature-Policy header and is now a critical privacy and security control for any modern web application.
The Referer header silently leaks URL fragments, session tokens, and user paths to third parties on every navigation. The Referrer-Policy header gives you precise control over what gets shared — and most sites are using the wrong setting.
GDPR is not just a legal document — Article 32 mandates concrete technical security measures that fall squarely on development teams. This guide translates the regulation into actionable implementation steps for developers and SaaS founders.
Most websites start their first security scan between 50 and 65 out of 100. Getting to 90+ is achievable in a single day if you know which fixes have the highest point impact. This guide walks through every major scoring category, the typical point cost of each failure, and the exact fix for each.
Security headers are the fastest way to harden a Next.js application. This guide covers all seven essential headers with production-ready configuration for both App Router and Pages Router.
You do not need an enterprise budget to find serious security vulnerabilities on your website. These five free methods cover everything from TLS configuration to missing HTTP headers and vulnerable dependencies.
X-Frame-Options and CSP's frame-ancestors directive both prevent clickjacking by controlling how your page can be embedded in iframes. But they are not equivalent — one is a legacy header, the other is the modern standard. This guide explains the differences, which to use, and why you should set both.
HSTS (HTTP Strict Transport Security) is a single header that eliminates an entire class of SSL stripping attacks. This guide explains how it works, how to configure it safely, and what you must check before enabling the preload flag.
A website security score gives you a single number that summarises how well your site is protected. This guide breaks down how the score is calculated, what the different ranges mean, and which fixes will move the needle fastest.