wget: Downloads, Mirrors, Connectivity Tests
The retry and resume behavior that makes wget worth keeping, spider mode as a health check, rate limiting, and the robots.txt rule that empties your mirror.
HTTP
The protocol most application outages actually live in. Articles tagged HTTP cover status codes, headers, request timing breakdowns, TLS failures and the client tools that expose all of it from the command line.
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curl for Network Engineers: Ports, HTTP, APIs
Prove a port is open, split DNS from TCP from server think time, test a device API and read a TLS failure, all with real output from a routed lab.