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This document explains the Cache-Control HTTP headers 'no-store', 'no-cache', and 'private', detailing their distinctions in controlling caching behavior for public and personalized responses, along with browser diagnostics and common pitfalls.
Separate a request timeout from the total retry budget, interpret Retry-After, and avoid duplicating writes when the server outcome is unknown.
Separate authentication, permissions, rate limits and service availability before retrying.
Use If-None-Match to revalidate cached responses and If-Match to avoid overwriting a newer representation.
Distinguish response access from request sending, inspect an OPTIONS preflight and configure explicit origins for credentialed browser requests.