At a time when Internet applications are growing rapidly and content is highly personalized, traditional static content acceleration methods can no longer meet the response requirements of dynamic requests. Compared with traditional static CDN, dynamic CDN focuses more on the scheduling and transmission acceleration of real-time content, personalized data and dynamic requests. This article will analyze the working principle of dynamic CDN in detail, and analyze its applicability in combination with actual application scenarios.

　　The essential difference between dynamic CDN and static CDN:

　　The core of static CDN lies in content caching. It pre-caches JS, CSS, pictures and other resources in web pages to edge nodes, and returns them directly from edge nodes when users visit, without requesting the source station every time. Dynamic CDN faces non-cacheable content, such as user login status, order information, API data requests, etc. Such requests must return the latest content generated by the source station in real time, so they cannot rely on traditional caching mechanisms.

　　The core acceleration mechanism of dynamic CDN:

　　Intelligent routing scheduling. Dynamic CDN uses BGP intelligent scheduling, Anycast routing and IP optimization technology to ensure that user requests are accessed to the optimal edge node nearby, and then forwarded to the source station at high speed by the edge node. In this way, even if the content is not cached, the path is still the shortest, reducing network jitter and cross-border delay.

　　TCP connection reuse. Dynamic CDN pre-builds and reuses long connections between edge nodes and source stations to avoid re-handshaking for each request, improve connection efficiency, and reduce the impact of 3-way handshakes and TLS handshake delays.

　　HTTP/2 and QUIC protocol support. Many dynamic CDN service providers enable support for HTTP/2 and even QUIC protocols on edge nodes to accelerate the arrival speed of the first packet, while multiplexing reduces header blocking and effectively improves request response speed.

　　Protocol optimization and dynamic compression. For the response data of dynamic content, the edge node can identify the client type according to the request header, perform content compression (such as Gzip, Brotli), and perform fine-grained optimization of the transmission path of the data packet to improve link efficiency.

　　Security protection and request control. Dynamic CDN usually integrates security modules such as WAF firewall, anti-CC attack strategy, and IP access control to ensure that the source station is not dragged down by malicious access, and at the same time, limit the flow and authenticate the request to ensure business security.

　　Edge script or edge computing capabilities. Advanced dynamic CDN can deploy edge script logic to pre-process some API requests at edge nodes, such as parameter verification, authentication, user diversion, etc., to reduce the pressure on the source station and improve the processing speed.

　　Typical business scenarios suitable for dynamic CDN:

　　1. E-commerce websites and shopping platforms. In e-commerce business, user operations are frequent and data is highly personalized, such as account login, shopping cart query, order creation, payment interface, etc. are all dynamic requests. Dynamic CDN can speed up the transmission speed of such requests and avoid user loss due to slow page response, especially during peak promotion periods.

　　2. SaaS platform and collaboration tools. Such as online forms, project collaboration, online meetings, CRM platforms, etc., all involve real-time data interaction and dynamic page generation between users. Dynamic CDN can help SaaS vendors optimize and accelerate API interface requests, WebSocket communications, etc., to improve the overall interactive experience.

　　3. Finance and online payment systems. In financial systems, dynamic CDN can ensure low latency and secure transmission of dynamic requests such as user identity authentication and transaction interfaces. It not only improves the experience, but also reduces the risk of attacks on sensitive businesses through edge protection.

　　4. Online education and video live broadcast platforms. In live broadcast and teaching platforms, in addition to video traffic, there are also a large number of dynamic requests (chat room information, user interaction, question and answer system, score records, etc.). These contents need to be processed and fed back in real time. Dynamic CDN can stably schedule request paths, reduce response time, and ensure that users can interact smoothly in class or live broadcast.

　　5. Mobile App and Mini Program Backend Services. In modern App architecture, the front end is only responsible for display, and most of the logic is implemented by calling the back end through interfaces. Every time a user opens a page, slides, or clicks, a dynamic request may be triggered. By distributing and optimizing these request paths through dynamic CDN, the user experience can be significantly improved and the request failure rate can be reduced.

　　6. Localization optimization of cross-border websites and overseas platforms. The biggest challenge facing cross-border businesses is unstable network links and high latency. By deploying dynamic CDN nodes in Southeast Asia, North America, Europe, etc., and combining local scheduling and protocol optimization, overseas users can access servers deployed in China, Hong Kong or Singapore more smoothly, which is the key infrastructure to achieve global access acceleration.

　　Deployment suggestions and precautions for dynamic CDN:

　　Choose a manufacturer with self-built global edge nodes to ensure global network scheduling capabilities;

　　Prioritize product lines that support HTTP/2 and QUIC protocol acceleration, taking into account compatibility and performance;

　　Whether the edge node supports security capabilities such as WAF/CC protection and IP whitelist to prevent interface attacks;

　　Dynamic CDN with strong optimization capabilities for mobile terminals and weak network environments has more advantages;

　　Combined with static CDN for mixed use to form a complete CDN acceleration system;

　　Configure the most appropriate scheduling strategy and access level according to business volume and access region.

　　Dynamic CDN is not a simple "cache acceleration" technology, it is a comprehensive acceleration solution covering intelligent scheduling, link optimization, security protection, protocol acceleration, and edge collaboration. Its goal is to ensure that dynamic content that cannot be cached and must be processed in real time can also have the same extremely fast response capabilities as static content.

　　For corporate websites and applications involving user personalized content, intensive interface requests, and a large number of overseas users, deploying dynamic CDN is no longer an option, but an infrastructure requirement to improve availability, response speed, and security. Whether you are a technical team that is building a modern architecture or a traditional enterprise that wants to reduce the pressure on the source station, correctly understanding and applying dynamic CDN will be an important part of improving the competitiveness of website and application services.