Ajax-related settings in IIS

Today, I found
Options for HTTP connection persistence

Description:

Enable HTTP connection persistence
Most Web browsers require the server to keep connections to multiple requests open, which is called "Keep HTTP Connection ". Maintaining connections is an HTTP specification that significantly enhances server performance. Without it, the browser will have to send multiple connection requests to webpages Containing Multiple Elements (SHAPES. You may need to generate a connection for each element. These additional requests and connections require additional server activity and resources, which reduces server efficiency and slows down browser response, especially for high latency) this is especially true for connections. During installation, "Keep HTTP Connection" is enabled by default ".

The first response is response. isclientconnected in ASP. The above connection timeout should be related to this. I used to wonder about the implementation principles and specific functions of ASP.
Then I thought about it. If this is enabled, multiple Ajax requests should always exist like database connections. It saves a lot of resources. There should be a lot worth studying here. Record first