Sunday, February 20, 2011

HOW THE WEB WORKS ? ? ? ? ? ?

The working of world wide web is based on client-server technology.The Internet user using a software known as a web browser requests a document located on the web.The browser makes the request to the Internet host  containing that document.
Thus a browser acts like a customer or client that requests for the information.The Internet host serves the information  and is thus called the server.
The flow of information is controlled by a protocol.The protocol used in this exchange is called HTTP.The client,or the user or web browser makes the HTTP request and is served by an HTTP server also known a web server.

  1. HTTP
  2. HTML
  3. URL's
     HTTP:-
              It is a set of rules  or protocol that governs the transfer of hypertext between two or more computers.The world wide web encompasses the universe of information that is available via protocol HTTP.

The exchange of information between client and server is controlled by a protocol called HTTP.The protocol transfers data in form of text,audio,video,images.
HTTP is called so because it is used in environment where there are rapid jump from one document to another .Thus , we can say that HTTP is the underlying protocol used by WWW which defines how much are formatted and transmitted and what action web server take in response to various commands.

Example:-When you enter a URL in your web browser this actually sends an HTTP command to the web server directing it to fetch and transmit the requested web page.


  HTML:-
            It stands for Hyper Text Markup language,it represents a way to take ordinary text and turn into Hyper Text,just by adding special elements called mark-up  tags that tell web browsers how to display a web page contents.The main goal of HTML is to be a universal language for classifying the function of different sections of a document.It is designed to work on a wide variety of platform .

HTML shares some important characteristics with its SGML parent:HTML is one member of a family of markup languages called SGML.

1)A character-based method for describing and expressing content.
2)A desire to deliver that content equally to multiple platforms.
 3)A method for linking document  components together to compose compound documents.

HTML  have different versions:
     1)HTML+
     2)HTML 2.0
     3)HTML 3.2
     4) HTML 4.0

URL's:-
         The term stands for Uniform Resource Locator.It is a string of characters that specify the address of a web page.A client that wants to access a web page needs an address.This  address of a web page is known as URL.The URL provides an addressing scheme which allows the browser to request just about any document or web page located anywhere on that document.A URL normally takes the form:
<protocol>://<web-server name>/<directory-name>/<file-name>
   or
http://www.yahoo.com/education/index.html

The first part of URL specifies the transfer protocol starting  at the leftmost portion of URL up to colon (:) tells the browser what type of server it will connect to and which protocol to use in order to retrieve / access the document,that is always represented by "//".

The second part of URL is full qualified domain name(FQDN) .It identifies the site running the server that controls the webpage the URL points to many sites.

The third part of URL identifies the full path name for a particular web page.The pathname is always preceded by single slash after the domain name.

Example:-http://www.microsoft.com/IE/index.html

TYPES OF URL
There are two types of URL
1)Absolute
2)Relative

Absolute URL use a complete Internet address to give the location of a resource.
Relative URL is not fully qualified but rather it inherits the protocol,host and path information from its parent document.








2 comments:

  1. Hey, very nice site. I came across this on Google, and I am stoked that I did. I will definitely be coming back here more often. Wish I could add to the conversation and bring a bit more to the table,but am just taking in as much info as I can at the moment. Thanks for sharing.

    Mango Juice

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  2. Thanks for your feedback...your comment boosted me.....feel free to ask your queries...i WL try my best to answr all ur queries in best possible way...😊😊

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