Stop Wasting Bandwidth: Master API Caching with ETags ⚡

Short summary

ETags and HTTP 304 responses eliminate redundant bandwidth by allowing servers to tell clients that cached data hasn't changed, sending tiny 304 headers instead of large JSON payloads. This tutorial implements a Laravel middleware that generates MD5-based ETags and the stale-while-revalidate directive to shift caching burden from cloud servers to client browsers. Result: massive cost savings on AWS egress fees and locally-native performance for dashboards polling frequently.

• •ETags enable 304 Not Modified responses, eliminating redundant data transmission
• •Laravel middleware automates ETag generation and cache headers for GET/HEAD requests
• •Stale-while-revalidate directive shifts storage burden to client browsers, reducing server costs

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