Network layer
Networks
Trace a request byte by byte and say where it can fail.
- 01
What happens when you curl a URL
Every step from the command to the first byte back.
- 02
DNS
Turning a name into an address, and caching it too long.
- 03
TCP
Handshakes, ordering, and why a dropped packet stalls everything.
- 04
TLS
How two strangers agree on a secret in public.
- 05
HTTP/1.1, 2 and 3
Same meaning, three ways to carry it.
- 06
WebSockets
Keeping a connection open for market data.
- 07
Proxies and load balancers
Who is really talking to your server.
- 08
Timeouts and retries
The settings that turn a slow service into an outage.