Details of an HTTP request inside the worker process

In a worker process, an HTTP request passes through several ordered steps, called events, in the Web Server Core. At each event, a native module processes part of the request, such as authenticating the user or adding information to the event log. If a request requires a managed module, the native Managed Engine module creates an AppDomain, where the managed module can perform the necessary processing, such as authenticating a user with Forms Authentication. When the request passes through all of the events in the Web Server Core, the response is returned to HTTP.sys. The following figure shows an HTTP request entering the Worker Process: