CORS: The Arch-Enemy of Frontend Devs
Panic over Red Error message? Browser isn't bullying you; it's protecting you.

Writing about development and technology.
Panic over Red Error message? Browser isn't bullying you; it's protecting you.

Why physical distance kills speed. Consistent Hashing, Edge Computing, Cache Purge strategies, and how CDNs defend against DDoS attacks.

HTTP is Walkie-Talkie (Over). WebSocket is Phone (Hello). The secret tech behind Chat and Stock Charts.

Learn BST via Up & Down game. Why DBs use B-Trees over Hash Tables. Deep dive into AVL, Red-Black Trees, Splay Trees, and Treaps.

Why did Facebook ditch REST API? The charm of picking only what you want with GraphQL, and its fatal flaws (Caching, N+1 Problem).

My Node.js server crashed every midnight with 'Heap Out of Memory'. The culprit? A global variable hoarding data. Through this debugging nightmare, I learned the true difference between Stack and Heap, how V8 Garbage Collection works, and how to prevent memory leaks.

Traffic lights from Server. 200 Success, 400 You failed, 500 I failed.

HTTP is a Postcard. HTTPS is a Sealed Envelope. Why Google forces you to use HTTPS.

Request gets Response. But has amnesia (Stateless), can't remember who you were 1 second ago. So we invented cookies as sticky notes.

When you don't want to go yourself, the proxy goes for you. Hide your identity with Forward Proxy, protect your server with Reverse Proxy. Same middleman, different loyalties.

Who is hiding? User (Forward) or Server (Reverse)?

Not just for Netflix. Creating a 'Secure Tunnel' in a hacker-infested public network.

Maintain login without session storage. Server just verifies token. The identity of Base64-encoded JSON. Why stateless scales better.

How whole family surfs with one Public IP. The magic of Network Address Translation concealing Private IPs.

Don't manually configure IP at cafes, right? DHCP server auto-finds and leases available IPs. Sign a 2-hour IP lease contract via DORA process.

How 8.8.8.8 works. Recursive vs Iterative queries, Record types (A vs CNAME), TTL caching strategies, and DNS security.

IP addresses change like home addresses. MAC addresses are like DNA or Fingerprints. Burned into hardware.

Reliable TCP vs Fast UDP. 3-Way Handshake, Flow Control, Header Analysis, Nagle's Algorithm, and Python Code examples for Chat Server.

TCP is polite. Before creating a connection, it greets 3 times. SYN, SYN-ACK, ACK. Why?

OSI 7 Layer is Theory. TCP/IP 4 Layer is Reality. Pragmatism beats Perfectionism.
