How does PHP capture the data of paging controls developed by. NET?

How does PHP capture the data of paging controls developed by. NET? For example
Http: // 121.28.49.84: 8003/
On the above page, select an enterprise on the left and click "monitoring data" on the top right. NET control, monitoring network requests find that each time the whole page is sent back, and the value of viewstate is carried, it is difficult to simulate. In addition, the UpdatePanel control is used, instead of requesting data from other interfaces.
My goal is to automatically capture the monitoring data on the right. Is there any way to capture all the data on the page?
P.S. the server environment is LAMP

Reply to discussion (solution)

This is the AJAX method used to obtain data. you can find the ajax url connection.

His AJAX uses the UpdatePanel of the. NET control and actually requests the current page itself. this will lead to the postback of the entire page, not the request for another interface address.
Viewstate is very complex and difficult to spell when I request to myself. what I submit outside of PHP seems to be not verified, and I don't know what the problem is.

His AJAX uses the UpdatePanel of the. NET control and actually requests the current page itself. this will lead to the postback of the entire page, not the request for another interface address.
Viewstate is very complex and difficult to spell when I request to myself. what I submit outside of PHP seems to be not verified, and I don't know what the problem is.

You can see the returned data, and submit the returned data each time.

Capture the previous page. when obtaining data, you must obtain the values starting with _ viewstate and _ E to continue the next page capture. There is no way to capture multiple threads. I don't know why Microsoft has such a silly design. These two values are usually very long, and server resources are saved, but a waste of network resources affects user experience.