![]() ![]() The page starts and is loaded when the request has completed the HTTP route. These are forwarded through HTTP, with HTTP modules being continuously stimulated until the ASP.NET page HTTP handler has the request. HttpRuntime creates a collection of HttpApplication objects. The worker process will open HttpRuntime.ProcessRequest and sometimes aspnet_isapi.dll as well, if it is an ASPX page. Once the application pool receives the request from HTTP.SYS, the ISAPI filter is loaded by the IIS worker process, or w3wp.exe. This is essentially the client asking for page access. This process is initiated when the client, or end user, inputs the website URL. The purpose of kernel mode is to use HTTP.SYS to accept incoming client requests, so it can then forward them to the application pool. You’ll find the IIS Admin Service, application pools, and virtual directories in user mode. Executed code in user mode commands APIs to communicate with equipment and reference memory, which is much more secure than kernel mode. If a mistake is made, the consequences are unlikely to be as devastating as if the error had occurred in kernel mode. With this mode, executed code cannot access hardware or reference memory, giving you a more secure environment to work within. Kernel mode is also where you’ll find HTTP.SYS. Any crashes within kernel mode can do a lot of damage to the system itself. This mode is primarily used when a process is trusted and mostly invulnerable.
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