CDN (Content Delivery Network) acceleration service is a technology used to improve the performance of websites and applications by distributing content to multiple nodes around the world so that users can get the content they need from the nearest node, thus realizing faster loading speeds and a more stable access experience. The following is a detailed description of how CDN acceleration services work.

1. Original server

The starting point of CDN Acceleration Service is the original server, i.e. the server that stores the content of a website or application, usually located in a data center or on the server of a cloud service provider. Raw servers house static and dynamic content such as web pages, images, videos, and applications.

2. CDN Nodes

CDN providers deploy a large number of CDN nodes around the world, which are geographically dispersed and usually located in network backbone nodes, data centers or cloud service providers’ server rooms. Each CDN node is equipped with high-performance servers and caching devices.

3. Content Caching

When a user initiates an access request, the request first arrives at the CDN node, which checks to see if it has a cached copy of the desired content, and if it does, it returns the content directly from the cache without having to request it from the originating server. In this way, the user can get the content from the nearest CDN node, which greatly reduces the transmission delay.

4. Content Update

If the CDN node does not have a cached copy of the desired content or the cached content has expired, the CDN node makes a request to the origin server for the latest content. The content is then cached to the CDN node so that subsequent user requests can be fetched directly from the node.

5. Intelligent Routing

CDN nodes use intelligent routing algorithms to select the best CDN node to respond to user requests based on the user’s geographic location and network conditions. This ensures that users get content from the nearest node, reducing transmission distance and network latency.

6. Dynamic Acceleration

In addition to static content acceleration, CDN acceleration services can also realize dynamic content acceleration. For example, in some cases, dynamically generated content (e.g., personalized recommendations, user login information, etc.) can also be cached to CDN nodes, thus reducing the burden on the original servers and improving response speed.

7. Caching Policy

CDN providers can configure caching policies according to different business requirements, such as setting caching time, caching rules and caching zones. This can optimize content distribution according to the actual situation and ensure that users get the latest and most suitable content.

To summarize, CDN acceleration service achieves fast loading and stable access to websites and applications by deploying nodes globally, caching content to the nearest node, and selecting the best node using intelligent routing algorithms. With CDN Acceleration Service, users can get a better access experience, and websites and applications can reduce the burden on the original server and improve performance and availability.