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Why Tomcat?

September 16, 2009 Leave a comment

 

 

Why Webserver?

Have you ever wondered about the mechanisms that delivered this page to you? So, when you clicked on the link for this page, or typed its URL (Uniform Resource Locator), what happened behind the scenes to bring this page onto your screen? If you’ve ever been curious about the process, or have ever wanted to know some of the specific mechanisms that allow you to surf the Internet, then read on. At the most basic level possible, the following diagram shows the steps that brought that page to your screen:

 

 

 

webserver-basic

 

 

The browser breaks the URL into three parts:

  • The protocol (“http”)
  • The server name (“www.tecneosis.com“)
  • The file name (“why-tomcat.htm”)

The browser communicates with a name server to translate the server name “www.tecnoesis.com” into an IP Address, which then the browser uses to connect to the server machine. The browser then forms a connection to the server at that IP address on port 80. Following the HTTP protocol, the browser sends a GET request to the server, asking for the file “http://www.tecnoesis.com/why-tomcat.htm.” The server then sends the HTML text for the Web page to the browser. The browser reads the HTML tags and formats the page onto your screen. Your browser forms a connection to a Web server, requests a page and receives it.

 

Clients and Servers:

In general, all of the machines on the Internet can be categorized as two types: servers and clients. Those machines that provide services (like Web servers or FTP servers) to other machines are servers. And the machines that are used to connect to those services are clients. When you connect to Yahoo! at www.yahoo.com to read a page, Yahoo! is providing a machine (probably a cluster of very large machines),to service your request. Yahoo! then is a server. Your machine, on the other hand, is a user machine also known as a client.

The server usually serves either static or dynamic pages to the client. Static pages are those that do not change unless the creator of the page edits it. Dynamic pages are those which the server has to perform certain processes (invoke the component that executes perticular logic) to dynamically display the content to the client.

 

Tomcat as a Webserver: Read more…

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