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Get the e-book: How to cache aggressively at the edge without serving stale or incorrect content to users.
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- Whitepaper Download
- Pages
- 24 pages
- File size
- 2.3 MB
A CDN misconfiguration allowed a user’s personalized dashboard to be cached and served to thousands of other users. The cache hit ratio looked fantastic—94% of requests served from edge — until support tickets started arriving with users seeing each other’s private data. The problem: caching returned personalized content without realizing it couldn’t be shared.
Edge caching is a correctness problem first, performance problem second. Aggressive caching dramatically improves performance and reduces origin load, but incorrect configuration serves wrong content to users — sometimes catastrophically.
This complete guide teaches you how to design cache keys and responses that enable aggressive caching without correctness bugs.
Read this e-book to understand:
- Cache key design and Vary headers: preventing content cross-contamination without destroying hit ratios
- HTTP cacheability: what methods, status codes, and headers control whether responses cache
- Cache invalidation strategies: TTL, purge APIs, versioning, and stale-while-revalidate patterns
- Authentication and personalization: private vs. public caching with Set-Cookie and Authorization
- Query string handling and cache key expansion: performance vs. flexibility tradeoffs
- Conditional requests and origin shield: reducing origin load with If-None-Match validation
- Real-world case studies: caching bugs that served stale or cross-contaminated content, and how to prevent them
Download Your Edge Caching Guide now to cache aggressively while maintaining correctness and preventing content cross-contamination.
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