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Webserver serves pages for viewing in web browser, application server provides exposes business logic for client applications through various protocols
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Webserver exclusively handles http requests.application server serves business logic to application programs through any number of protocols.
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Webserver delegation model is fairly simple,when the request comes into the webserver,it simply passes the request to the program best able to handle it(Server side program). It may not support transactions and database connection pooling.
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Application server is more capable of dynamic behaviour than webserver. We can also configure application server to work as a webserver.Simply application server is a superset of webserver.