AJAX-Related settings in IIS server

Today in IIS found a
Options for keeping HTTP connections

Described below

Enable Keep HTTP connections
Most WEB browsers require the server to remain connected to multiple requests, which is called "Keep HTTP connections." Maintaining a connection is an HTTP specification that can significantly enhance server performance. Without it, browsers will have to make multiple connection requests to pages that contain multiple elements, such as graphics. 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 the browser and is insensitive to response, especially for high latency (slow) connections. The "Keep HTTP connection" is enabled by default during the installation process.

The first reaction is the response.isclientconnected in the ASP, the connection timeout above should be related to this. I've been wondering about the implementation principle and concrete function of ASP this Dongdong
Then think, if this is turned on, Ajax multiple requests should be similar to the database connection, the connection is always there. Will save a lot of resources. There should be a lot of things worth studying here. Let's record the