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What is application server and what is web server?
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Answer Posted / uday kumar. a
A Web server serves pages for viewing in a Web browser,
while an application server provides methods that client
applications can call.
A Web server exclusively handles HTTP requests, whereas an
application server serves business logic to application
programs through any number of protocols.
The Web 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, 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 doesn't provide any functionality beyond
simply providing an environment in which the server-side
program can execute and pass back the generated responses.
The server-side program usually provides for itself such
functions as transaction processing, database connectivity,
and messaging.
While a Web server may not itself support transactions or
database connection pooling, it may employ various
strategies for fault tolerance and scalability such as load
balancing, caching, and clustering.
The application server
an application server exposes business logic to client
applications through various protocols, possibly including
HTTP. While a Web server mainly deals with sending HTML for
display in a Web browser, an application server provides
access to business logic for use by client application
programs. The application program can use this logic just
as it would call a method on an object.
The information traveling back and forth between an
application server and its client is not restricted to
simple display markup. Instead, the information is program
logic. Since the logic takes the form of data and method
calls and not static HTML, the client can employ the
exposed business logic however it wants.
the application server manages its own resources. Such gate-
keeping duties include security, transaction processing,
resource pooling, and messaging. Like a Web server, an
application server may also employ various scalability and
fault-tolerance techniques.
Additionally, most application servers also contain a Web
server, meaning you can consider a Web server a subset of
an application server. While application servers contain
Web server functionality, developers rarely deploy
application servers in that capacity. Instead, when needed,
they often deploy standalone Web servers in tandem with
application servers.
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