Notes on Systems

learning security, networking, and the structure behind software

Why Your API Works in Postman but Fails in the Browser

An in-depth exploration of Cross-Origin Resource Sharing (CORS), preflight requests, and common pitfalls, accompanied by a hands-on demo.

26 min read · March 15, 2026

2026 · web-security browsers networking · security-internals
F5 BIG-IP + Wazuh: Getting Logs Working After 18 Months

How I finally got F5 BIG-IP and Wazuh to exchange logs — configuration steps, troubleshooting, and lessons learned from an 18-month integration.

8 min read · November 08, 2025

2025 · f5 wazuh logging waf siem networking
TOON - The New JSON

TOON is about to take a wild ride in LLMs. Its going to save you money, time & power. Go through it.

4 min read · November 07, 2025

2025 · TOON JSON AI LLMs Tokens Optimization
Three Essential HTTP Routing Patterns

HTTP routing patterns - the three crucial approaches (Host-based, Path-based, and Header-based) that determine how web traffic is directed to different services, enabling efficient request handling and service management in modern web architectures.

2 min read · April 18, 2025

2025 · webdev backend networking routing http
WebAssembly: Will this replace Docker?

WebAssembly vs Docker. WASM, a technology that revamped the way we thought about containerization.

6 min read · December 27, 2024

2024 · docker containerization wasm webassembly kubernetes