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Infrastructure

Content Delivery Networks

Choose whether and how to add a separate delivery layer by cacheability, origin architecture, invalidation, geography, control, and traffic economics.

Recommendation

Defer a separate CDN until the delivery problem is explicit.

Many hosting platforms already deliver static assets and cached responses; a separate CDN earns its place through origin, cache, geography, control, or commercial requirements.12

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

Main trade-off

A CDN can reduce latency and origin load while adding cache invalidation, proxy behavior, observability, traffic economics, and another provider boundary.12

Four CDN operating routes

The routes differ in cloud integration, programmability, bundled controls, and commercial model.

  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

Delivery routes

Choose the delivery model that matches origin and cache behavior, then verify provider-specific controls and economics.

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

Boundary: 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.

What changes the CDN decision

Cache correctness and origin economics matter more than headline network size.

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

Official resources

Use the primary documentation to verify runtime behavior, operating limits, service boundaries, and current commercial terms.

Sources

Official documentation supporting the routes and decision boundaries on this page.

  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