Grokking Scalable Systems for Interviews

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What are HTTP Conditional Requests (ETag, If‑None‑Match, Last‑Modified) and How They Reduce Load?

HTTP conditional requests are special HTTP requests that use headers (like ETag or Last-Modified) to check if a cached resource has changed, so unchanged content isn’t re-downloaded, reducing server load and saving bandwidth.

What Are HTTP Conditional Requests?

In web caching, a conditional request means the client (e.g. your browser) asks the server **only to send a resource if certain condi

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