Practical guides to AI, Python, Git, SQL, Web/API, SAP/ERP and mathematical models, with explanations, code examples, sources and limitations.
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Distinguish storage, validation and shared caching. Three response policies show when to use public max-age, private no-cache and no-store.
Separate a request timeout from the total retry budget, interpret Retry-After, and avoid duplicating writes when the server outcome is unknown.
Use If-None-Match to revalidate cached responses and If-Match to avoid overwriting a newer representation.
Understand the differences between offset-based and cursor-based pagination and when to use each, especially when dealing with frequently changing datasets.
Distinguish response access from request sending, inspect an OPTIONS preflight and configure explicit origins for credentialed browser requests.