How the Web Works
DNS, HTTP and TLS - and why a 200 can still be broken.
- 1What happens when you press EnterFour stages - DNS, TCP, TLS, HTTP - stand between you and every web page. Break each one and learn to read where a request died from how it died.Runs in your browserOn your machine14 min+35 XP
- 2A 200 can still be brokenExit codes and status codes say a request completed, not that it worked. Watch three health checks get fooled, and learn to assert on what came back.Runs in your browserOn your machine13 min+35 XP
- 3Two TLS errors, one messageA wrong name and an untrusted issuer look identical in a browser and in curl. One verify code tells them apart, and they have opposite fixes.Runs in your browserOn your machine15 min+40 XP
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