Nodejs handles long requests

Advantages and Applications of Connection

With the rapid development of Internet technology, users have increasingly higher requirements for the performance and experience of network applications. Synchronous blocking traditional network applications perform poorly when handling a large number of requests and are easily defeated by DOS attacks. Asynchronous non-blocking network applications can better balance resource overhead and achieve high concurrent processing of requests. Among them, Node.js, as a lightweight, event-driven JavaScript back-end framework, is highly efficient and scalable. Features, especially excellent in handling long connection requests.

Request long connection (Keep-Alive) means that one TCP connection can send multiple requests at the same time, instead of generating a new TCP connection for each request. This method can reduce the I/O pressure of the server. , reduce network latency and improve application performance.

In ordinary Web architecture, HTTP connections are established and closed very frequently, and the connection needs to be re-established for each request. This method seriously affects the performance of the server in the case of a large number of concurrent requests. Requesting a long connection can solve this problem very well. Multiple requests can share the same TCP connection, which reduces the overhead of establishing and closing connections. It also reduces the number of TCP handshakes and alleviates the shortcomings of TCP short connections.

Node.js provides an event loop (event loop) mechanism so that applications do not have to focus on blocking I/O operations when processing requests, but can achieve high performance in an asynchronous and non-blocking manner. concurrent. Requesting a long connection is more suitable for this architecture. It can make full use of the event-driven characteristics of the node. Through asynchronous I/O and event-driven mechanisms, it can reduce loop time and I/O overhead without blocking the main thread. Handle every request well.

Node.js provides a rich asynchronous I/O library and event-driven system, including file system, network, process and other modules. Users can flexibly select according to business needs. At the same time, Node.js is also widely used in real-time communication scenarios such as Websocket and long polling. These scenarios use long connection requests to make instant communication more convenient and efficient.

Node.js’s request long connection processing capability benefits from its single-threaded execution model. In the Javascript V8 engine, a single thread can make full use of CPU and memory resources, reducing the cost of resource occupation, and thus Improved performance. At the same time, the event loop mechanism of Node.js also enables applications to make full use of CPU task switching and I/O asynchronous operations for efficient processing, thereby achieving high concurrency under long-term connection requests.

In short, Node.js, as a lightweight, efficient and scalable back-end framework, has certain advantages and application scenarios. For network applications that require long connections and high concurrency processing, especially real-time communication and push scenarios, Node.js is undoubtedly a choice worth considering. Through reasonable planning and optimization, Node.js applications can fully realize their potential and bring users a better network experience.

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