Computer Science·May 14, 2025
HTTPS: The Invisible Armored Car
HTTP is a Postcard. HTTPS is a Sealed Envelope. Why Google forces you to use HTTPS.
#CS#Web#HTTPS#Security
Writing about development and technology.
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.
Who is hiding? User (Forward) or Server (Reverse)?
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.
Class is there, but style is missing? Debugging Tailwind CSS like a detective.
HTTP is stateless. How Cookies and Sessions solve this. Comparing Stateful Auth (Session) vs Stateless Auth (JWT).
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.
Why 7 layers? Pizza analogy, Hardware mapping, and Security attacks per layer (ARP Spoofing, SYN Flood, SQL Injection).
Don't write 100 lines of 'if' to validate email. Use the cryptic power of Regex.
Smart Brute Force. If a path looks unpromising, discard it immediately (Pruning) and go back. N-Queen Problem.
Choosing immediate profit without thinking about future. Sometimes shortsightedness is the optimal solution.
Scary name, simple concept. It's just 'Memoization'. Solving Fibonacci without burning the CPU.
