Networking
CORS: Why It Exists and How to Stop Fighting It
CORS errors are among the most common and most frustrating things developers encounter. Understanding the security model behind it makes the errors predictable and the fixes obvious.
Networking
WebSockets: When Request-Response Is Not Enough
How WebSockets work, what they are actually good for, and the patterns for building real-time features without the common pitfalls.
Networking
DNS Explained: From Typing a URL to Getting a Response
What actually happens when you type a domain name into a browser - the full DNS resolution chain, from recursive resolvers to authoritative nameservers.
Networking
HTTP from the Ground Up: Request, Response, Headers
Every web application runs on HTTP. Here is what is actually in those bytes - and why the details matter.
Networking
HTTPS and TLS: What Happens During the Handshake
HTTPS is HTTP with a security layer underneath. Here is exactly what that layer does and how it does it.