Ajax call processing page error message 500 solution

I recently encountered a problem while working on a project:

After it was completed on the local server, it was deployed to the Alibaba Cloud virtual host. As a result, there was a problem with accessing the page. Since the login used the AJAX call processing page, nothing happened when I clicked to log in.

Open F12 debugging and find an error message:

Failed to load resource: the server responded with a status of 500 

So I looked for a solution online. After trying many methods, I finally solved it myself.

The reason for the error is: Error in processing the page! It's not an AJAX problem.

Because the fetch_all() function I used is only available with MySQL Native Driver.

So it can be executed successfully after modification.

If you encounter this kind of error, go to the page debugging to find the problem and solve it.