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任务决策

CDN：用缓存策略改善体验，而不是掩盖源站问题

为静态资源、动态边缘逻辑和全球交付建立清晰的缓存边界。

Recommendation

已有 Cloudflare 交付层时优先统一在其边缘能力中；复杂源站与多云策略再扩展。

先确定哪些响应可安全缓存、何时失效以及访问控制如何生效。12

适用范围： Web and platform teams with measurable content-delivery, origin-load, latency, or traffic-control needs

Main trade-off

边缘规则提升全球响应，但增加缓存一致性和调试复杂度。12

选择标准

按真实约束逐项判断，不要只比较功能列表。

  1. Cache contract

    Define cacheable objects, keys, TTLs, revalidation, purge, stale behavior, cookies, authorization, and personalized responses.13

  2. Origin and geography

    Map origins, failover, regions, latency, shielding, transfer, residency, and compliance requirements.2

  3. Control and security

    Separate CDN needs from edge compute, DNS, WAF, bot, TLS, and application-security decisions even when bundled.3

  4. Traffic economics

    Model regional bandwidth, request volume, cache hit ratio, origin egress, invalidation, logging, functions, and support.4

适用路线

这些条件会改变默认答案；请在作出承诺前逐项验证。

An integrated reverse proxy and cache fit

Evaluate Cloudflare CDN.

One network can combine proxying, caching, purge controls, and adjacent delivery services.

Verify: Keep CDN claims product-specific and verify plan, cache, origin, and migration boundaries.12

Origins and operations are AWS-centered

Evaluate Amazon CloudFront.

AWS distribution, origin, identity, function, and operational integration can reduce assembly.

Verify: Model configuration, transfer, request, logging, function, and adjacent-service costs.12

Delivery programmability is a core requirement

Evaluate Fastly CDN.

Fine-grained cache and request control can fit teams with advanced delivery engineering needs.

Verify: A simpler bundled CDN is preferable when specialist control and commercial complexity do not create leverage.123

A focused CDN and visible traffic model fit

Evaluate Bunny CDN.

A narrower delivery product can simplify evaluation for straightforward global content delivery.

Verify: Verify geographic coverage, feature depth, support, and region-shaped traffic economics.124

边界： Application Cache owns reconstructable application data; edge compute owns code execution; WAF owns request filtering. A hosting platform's built-in delivery may make a separate CDN unnecessary.

关键差异

把真正会改变决策的边界单独比较。

Cache behavior
Keys, TTLs, purge, stale serving, revalidation, and personalization determine correctness.13
Origin integration
Cloud storage, load balancers, identity, shielding, and failover can reduce or add operating work.2
Programmability
Rules, functions, request transformation, and observability expand both control and failure surface.3
Economics
Traffic geography, cache ratio, origin egress, request classes, logs, and support shape total cost.3

官方资源

官方文档与继续决策的正式路径。

来源

支撑页面关键主张的资料。

  1. 1
    Cloudflare Cache documentation

    Cloudflare · Accessed Official

  2. 2
    Amazon CloudFront introduction

    Amazon Web Services · Accessed Official

  3. 3
    Fastly cache concepts

    Fastly · Accessed Official

  4. 4
    Bunny CDN documentation

    Bunny · Accessed Official