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SHORT READ
HTTP Status Code Cheat Sheet for API Design
A practical status-code decision sheet that keeps API behavior predictable for clients and operators.
BackendAPIsEngineering Standards
Go Deeper
This short read is the fast path. The linked long-form post covers full architecture, tradeoffs, and implementation details.
Read the Full HTTP Contract GuideAdditional Reads
Trusted references that add context beyond nat.io and help you validate decisions faster.
- HTTP response status codes MDN
Developer-friendly status code definitions and examples.
- RFC 9110: HTTP Semantics (Status Codes) IETF
Primary protocol specification for status semantics.

