Overview of an HTTP request

Let's observe HTTP requests of IIS 10.0 IIS 7 and later versions have an HTTP request-processing flow similar to that of IIS 6.0 and below.

1. When a client browser initiates an HTTP request for a resource on the web server, HTTP.sys intercepts the request.
2. HTTP.sys contacts Windows Activation Service (WAS) to obtain information from the configuration store.
3. WAS requests configuration information from the configuration store, applicationHost.config.
4. The World Wide Web Publishing Service (WWW Service) receives configuration information, such as application pool and site configuration.
5. The WWW Service uses the configuration information to configure HTTP.sys.
6. WAS starts a worker process for the application pool to which the request was made.
7. The Worker Process processes the request and returns a response to HTTP.sys.
8. The client receives a response.