Difference between a "Web server" and "Application Server"
A Web server handles the HTTP protocol. When the Web server receives an HTTP request, it responds with an HTTP response, such as sending back an HTML page. To process a request, a Web server may respond with a static HTML page or image, send or redirect, or delegate the dynamic response generation to some other program such as CGI scripts, JSPs (JavaServer Pages), servlets, ASPs (Active Server Pages), server-side JavaScripts, or some other server-side technology. Whatever their purpose, such server-side programs generate a response, most often in HTML, for viewing in a Web browser.The web server simply passes the request to the program to handle it. The web server does not provides any functionality beyond providing an environment in which the server - side program can execute and pass back the generated responses. The server-side program usually provides such functions as transaction processing, database connectivity and messing .
Application Server:
A Web server handles the HTTP protocol. When the Web server receives an HTTP request, it responds with an HTTP response, such as sending back an HTML page. To process a request, a Web server may respond with a static HTML page or image, send or redirect, or delegate the dynamic response generation to some other program such as CGI scripts, JSPs (JavaServer Pages), servlets, ASPs (Active Server Pages), server-side JavaScripts, or some other server-side technology. Whatever their purpose, such server-side programs generate a response, most often in HTML, for viewing in a Web browser.The web server simply passes the request to the program to handle it. The web server does not provides any functionality beyond providing an environment in which the server - side program can execute and pass back the generated responses. The server-side program usually provides such functions as transaction processing, database connectivity and messing .
Application Server:
While an application server exposes business logic to client applications through various protocols like HTTP, TCP-IP etc. All the web servers mainly deals with sending HTML for displaying to a Web browser. An application server providers allows the client to access the business logic for use. The application server is used to run business logic or dynamically generating presentation code. A J2EE application server runs servlets and JSPs that are used to create HTML pages dynamically. In this case, J2EE application server can run EJBs – which are used to execute business logic. An application server is more capable of dynamic behaviour than webserver.
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