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#curl

2 stories

Banner: a packet travelling through stacked checkpoints for DNS, routing, TCP and TLS

Networking & DNS

Network troubleshooting along the packet path: DNS, routing, TCP, TLS and HTTP

John Nguyen · Nov 3, 2025 · 9 min read

When a service cannot reach an API, guessing wastes hours. We follow the packet: name resolution, route, TCP handshake, TLS, then HTTP, with one or two commands per layer that each prove or eliminate a whole class of causes.

Banner: debugging HTTP requests from the terminal with curl timing and header output

Networking & DNS

Debugging HTTP with curl: headers, DNS overrides, timing and TLS

Daniel Tran · Oct 7, 2025 · 8 min read

Most HTTP bugs can be pinned down with one tool you already have. This guide shows the curl options we use daily: verbose output, header-only requests, --resolve and --connect-to for testing servers before DNS changes, timing breakdowns, protocol versions and TLS checks.