Have you ever had the following needs: need to add a unified signature to all ajax requests, need to count the number of times a certain interface is requested, need to limit the method of http requests to get or post, need to analyze other people's network protocols, etc., so what? Do? Think about it, if you can intercept all ajax requests, then the problem will become very simple!
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
