Tech Stacks - CDN

Benefit: removing all single points of failure, closer to user， faster round trip, less crowded

Types of Content

• static content: html, pdf, images
• steaming media: live or on-demand media
• dynamic content: assembles dynamic content on edge servers. ESI(Edge Side Includes) is similar to server-side include languages, but adds fault-tolerance features (for when the origin server is unavailable) Using ESI lets a content provider break a dynamic page into fragments with independent cacheability properties. ESI reduced bandwidth requirements for dynamic content by 95 to 99 percent.

Companies/Services

• Akamai: 15 and 30 percent of all web traffic, many large companies are using Akamai.
• CloudFlare: handles ~10% of web traffic including 7% of the million most popular websites. Cheaper; can start with the free plan.
• AWS CloudFront: if you use AWS.