HTTP & REST API Cheat Sheet (Printable PDF)

For when the call returned 200 and still didn't do anything.

Use it when: you're debugging a webhook and need to know what a status code actually promises. When you're building a request by hand and the API rejects it for a reason it won't name. When you're writing an integration and have to decide what counts as success.

On the sheet: status codes grouped by what they mean for your error handling, the methods and what they're allowed to do, the headers that matter in practice, curl for building and inspecting requests, and JSON request/response shapes.

Not on it: OAuth flows and API-specific authentication. Those differ per provider and don't fit on a card that stays true.

Anyone wiring up automations across services spends more time here than they expect.

Format: 3-page US Letter PDF, dark terminal theme, print-ready. Instant download, no account needed.

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