suresh When an HTTP request is received by IIS, the process of handling the request involves multiple key components. These components work together to ensure the request is served efficiently.
1. HTTP.sys: The first component that comes into play is HTTP.sys, which is a kernel-mode driver in Windows that acts as a request queue for incoming HTTP requests. It listens for incoming requests and passes them on to the appropriate application pool in IIS.
2. Application Pools: Application pools are isolated environments within IIS that host one or more web applications. Each application pool has its own worker processes that can handle incoming requests independently, providing better performance and reliability.
3. Worker Processes (w3wp.exe): The worker processes are responsible for processing the requests and generating responses. Each worker process is associated with an application pool and can handle multiple requests simultaneously.
4. HTTP Modules: HTTP modules are components that can be plugged into the request processing pipeline to intercept and modify incoming requests or outgoing responses. They provide extensibility and customization options for developers.
5. Handlers: Handlers are responsible for mapping incoming requests to the appropriate resources on the server. They determine how the request will be processed and which module or application will handle it.
By leveraging these key components, IIS efficiently handles HTTP request processing, ensuring that requests are processed quickly and accurately.
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