Hello teacher, there is no problem with the interface configuration of my test account. Passed the verification. The information is shown in the figure. 
Follow your instructions, start at index.php, comment out valid(), and add responsesMSG(). But when I send a message to it using my mobile phone, there is no response.
The responseMSG code is as follows:
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
