Shulou(Shulou.com)06/03 Report--

What is the difference between an APP server and a Web server? First of all, we need to know what an APP server is. What is a Web server? Xiao Bian summarized the following contents for everyone. Let's look down together.

Web servers serve pages to make them browsable, and Web servers specialize in handling HTTP requests.

App servers provide methods that client applications can call, and they serve business logic for applications through many protocols.

1. Web server

Web servers can handle the HTTP protocol. When a Web server receives an HTTP request, it returns an HTTP response, such as an HTML page. In order to process a request, the Web server may respond to a static page or image, perform a page redirect, or delegate the generation of a dynamic response to some other program such as CGI scripts, JSP(Java Server Pages) scripts, servlets, ASP(Active Server Pages) scripts, server-side JavaScript, or some other server-side technology. Regardless of their purpose, these server-side programs usually generate an HTML response that browsers can view.

Remember that the delegation model of a Web server is very simple. When a request is sent to a Web server, it simply passes the request to a program that handles the request well. A Web server simply provides an environment in which server-side programs can execute and responses can be returned, without going beyond the scope of its functions. Server-side programs usually have transaction processing, database connectivity, and messaging capabilities.

Although the Web server does not support transaction processing or database connection pooling, it can deploy various strategies to achieve fault tolerance and scalability, such as load balancing, caching. Clustering-features are often mistaken for application server-specific features only.

II. APP Server

By our definition, as an application server, it exposes business logic to client applications via various protocols, including HTTP. Web servers are primarily concerned with sending HTML to browsers for browsing, while application servers provide access to business logic for client applications to use. Applications use this business logic just as if you were calling a method of an object (or a function in a procedural language).

The client side of the application server (which includes a graphical user interface (GUI)) may be running on a PC, a Web server, or even another application server. Information traveling back and forth between an application server and its clients is not limited to simple display tags. Rather, this information is program logic. It is because this logic takes the form of data and method calls rather than static HTML that clients can use this exposed business logic at will.

In most cases, application servers expose business logic (to client applications) through application program interfaces (APIs) of components, such as EJB(Enterprise JavaBean) component models based on J2EE(Java 2 Platform, Enterprise Edition) application servers. In addition, application servers can manage their own resources, such as gate-keeping duties including security, transaction processing, resource pooling, and messaging. Just like Web servers, application servers are configured with a variety of scalability and fault tolerance technologies.

Nowadays, WEB servers can also have the ability to process data and response by transmitting XML payloads to servers, and APP server servers also contain WEB server functions to a certain extent.

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