What happens when you type a URL and hit Enter?
The choreography of systems that runs in under a second: from name to IP, the connection, the request and the render.
Learning path
How a secure web request works
Follow the complete journey from entering a URL to receiving a secure application response.
DNS: the address book of the internet (and when it lies)
How a name becomes an IP, why a change "takes time to propagate", and what you see —and don't— when DNS fails.
TCP vs UDP: reliability versus speed
Guaranteed delivery or speed with no promises. Why a payment demands TCP and a video call prefers UDP.
HTTP and HTTPS: what travels in the clear and what the padlock protects
What an HTTP request really is, what TLS adds, and what the browser padlock does —and does not— tell you.
Symmetric and asymmetric encryption: why they're used together
Two families of keys with opposite strengths. Why TLS doesn't pick one, but combines both.
Digital certificates: why your browser trusts a site
What a certificate is, who signs it, and how the chain of trust that holds up the web is built.