All requests are handled by worker processes that are isolated from the Web server itself. Worker process isolation mode enables you to completely separate an application in its own process, with no dependence on a central process such as Inetinfo.exe to load and execute the application. An application pool corresponds to one request routing queue within HTTP.sys and one or more worker processes. In this application isolation mode, you can group Web applications into application pools, through which you can apply configuration settings to the worker processes that service those applications. Worker process isolation mode is the new IIS request processing model. For more information about worker processes, see Worker Processes. Worker processes use HTTP.sys to receive requests and send responses over HTTP. A worker process is user-mode code whose role is to process requests, such as returning a static page or invoking an Internet Server API (ISAPI) extension or filter. The new request-processing architecture and application isolation environment enables individual Web applications, which always run in user mode, to function within a self-contained worker process. For more information about HTTP.sys, see HTTP Protocol Stack. HTTP.sys listens for, and queues, HTTP requests. HTTP.sys resides in kernel mode, where operating system code, such as device drivers, runs. sys) to receive Hypertext Transfer Protocol (HTTP) requests from the Internet and return responses. Both modes rely on the HTTP protocol stack (also referred to as HTTP. In IIS 6.0, application isolation is configured differently for each of the two IIS application isolation modes. Application isolation is the separation of applications by process boundaries that prevents one application or Web site from affecting another and reduces the time that you spend restarting services to correct problems related to applications. IIS 6.0 runs a server in one of two distinct request processing models, called application isolation modes. IIS 6.0 provides a redesigned World Wide Web Publishing Service (WWW service) architecture that can help you achieve better performance, reliability, scalability, and security for your Web sites, whether they run on a single server running IIS or on multiple servers.
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