HTTP Request Processing in IIS section might be misleading

[agitkaplan]

I think steps at the below link might be wrong. It says HTTP.sys gets request later asks WAS to it configure HTTP.sys back. But according to my observations HTTP.sys starts listening defined ports before gettig any request. So this makes me think HTTP.sys is already configured before the first request. I would be happy to know if the current document is mistaken or am I missing a point. Thanks.

https://docs.microsoft.com/en-us/iis/get-started/introduction-to-iis/introduction-to-iis-architecture#http-request-processing-in-iis