What Happens When You Type a URL

HardSecurity & Infrastructure00:00

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Your question is What Happens When You Type a URL. Take a moment with it on the right.

Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).

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Problem

Describe what happens when you type a URL in your browser.

Explain the request from URL parsing through DNS resolution, connection establishment, TLS, HTTP exchange, response handling, and page rendering. Include relevant caches, redirects, cookies, trust boundaries, and the security threats addressed by HTTPS, certificate validation, same-origin policy, and browser sandboxing.

Walk through the normal HTTPS path.
Identify important failure modes and security checks.
Explain how you would diagnose a slow request or certificate error.