These are the primary sources we point engineers at. Specifications settle arguments that blog posts cannot, and citing one in a vendor thread tends to shorten the thread.
- RFC 9110: HTTP Semantics
- The authoritative definition of status codes, conditional requests and caching. Settles most disagreements about what a given response is supposed to mean.
- RFC 9457: Problem Details for HTTP APIs
- A standard structure for machine-readable error responses. Worth adopting on APIs you publish and worth looking for in those you consume.
- RFC 6585 (Additional HTTP Status Codes
- Defines 429 Too Many Requests and the Retry-After semantics that correct backoff behaviour depends on.
- RFC 6749) The OAuth 2.0 Authorization Framework
- The base specification for the authorisation flows and refresh semantics behind most credential expiry failures.
- RFC 8725 (JSON Web Token Best Current Practices
- Practical guidance on validating tokens correctly, including the algorithm confusion mistakes that are still common.
- RFC 9421) HTTP Message Signatures
- A standard approach to signing HTTP messages, relevant when verifying inbound webhook authenticity.
- OWASP API Security Top 10
- The reference list of API-specific risks. Useful as a review checklist for any integration you expose.
- OWASP Cheat Sheet Series
- Concise implementation guidance across authentication, secrets management and input validation.
- Standard Webhooks
- An open specification covering payload structure, signatures and retry semantics for webhook producers and consumers.
- NIST Secure Software Development Framework
- A practice framework worth citing when integration security requirements need an external reference in a vendor conversation.
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