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What are the major differences between Web Server and
Application Server?
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Answer Posted / ravi v v
Pleae find an Example for the above one.
An example
As an example, consider an online store that provides real-
time pricing and availability information. Most likely, the
site will provide a form with which you can choose a
product. When you submit your query, the site performs a
lookup and returns the results embedded within an HTML
page. The site may implement this functionality in numerous
ways. I'll show you one scenario that doesn't use an
application server and another that does. Seeing how these
scenarios differ will help you to see the application
server's function.
Scenario 1: Web server without an application server
In the first scenario, a Web server alone provides the
online store's functionality. The Web server takes your
request, then passes it to a server-side program able to
handle the request. The server-side program looks up the
pricing information from a database or a flat file. Once
retrieved, the server-side program uses the information to
formulate the HTML response, then the Web server sends it
back to your Web browser.
To summarize, a Web server simply processes HTTP requests
by responding with HTML pages.
Scenario 2: Web server with an application server
Scenario 2 resembles Scenario 1 in that the Web server
still delegates the response generation to a script.
However, you can now put the business logic for the pricing
lookup onto an application server. With that change,
instead of the script knowing how to look up the data and
formulate a response, the script can simply call the
application server's lookup service. The script can then
use the service's result when the script generates its HTML
response.
In this scenario, the application server serves the
business logic for looking up a product's pricing
information. That functionality doesn't say anything about
display or how the client must use the information.
Instead, the client and application server send data back
and forth. When a client calls the application server's
lookup service, the service simply looks up the information
and returns it to the client.
By separating the pricing logic from the HTML response-
generating code, the pricing logic becomes far more
reusable between applications. A second client, such as a
cash register, could also call the same service as a clerk
checks out a customer. In contrast, in Scenario 1 the
pricing lookup service is not reusable because the
information is embedded within the HTML page. To summarize,
in Scenario 2's model, the Web server handles HTTP requests
by replying with an HTML page while the application server
serves application logic by processing pricing and
availability requests.
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