Network--Introduction to URL

Good Morning Boys

Web Address is an important way of reaching the web resources available on the WWW.
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The Google Meet link for this class is:

Meeting ID

meet.google.com/ufs-rjdk-puo

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By the end of this session, you will be able to:

• Understand the purpose and structure of a URL
• Understand the nuances of a URL 
• Understand the types of URLs available
• Apply the learning and identify the URL components.

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Web Address (URL)

• URL stands for Uniform Resource Locator
• Also known as Universal Resource Identifier
• Most URLs are Web Addresses, while other type of URLs may be used in a web browser for accessing newsgroups, local files on your computer and other resources.
• Each resource on the WWW has a unique address.
• It is made up of several parts, each is separated from the other by a single forward slash(/).

Syntax 
Server or scheme type:// domain name.domain extensions (Host)/path 
-----------------------          -------------------------------------------       -------
           1                                                2                                             3
Eg.        http://www.games.com/game/burger-shop/playNow.html
           ------    --------------------   ---------------------------------------
               1                   2                                 3

1. Name of the Internet server or scheme:

• Normally represents a type of server and the protocol on the internet
• Default server is http
• some of the schemes and services available are:
• http---------Hypertext Transfer Protocol
• ftp----------File Transfer protocol
• file---------File name on your hard drive.
• gopher-----The Gopher Protocol
• news-------USENET news
• mailto-----Electronic mail address

2. Name of the host :

• consists  of Domain Name, name given to the website
• last three characters specify type of organization
• Example ----- www.games.com

         Here,     www---> host
                       games-----> second level domain
                       com------->top level domain

• Port name is optional so normally we leave it blank.

3. Path:

• denotes the actual location of the file in the website
• In the Example:

           http://www.games.com/game/burger-shop/playNow.html

                 /game/burger-shop/ is the path or location of the file playNow.html
Some valid URLs:

• ftp://host.com
• mailto:zxc@yahoo.com
• http//www.stcolumbas.edu.in

Types of URLs
              
ABSOLUTE URL:

• fully qualified URL
• specifying the 
• the service or protocol name
• the complete host
• domain 
• path showing the location of the file.
• Example:    www.goodfun.com/Art/glasspainting.html

Partial or Relative URL:

• specifies the location of a resource or file relative to the starting point shown by absolute URL.
• normally used in hyperlinks, when we want to jump to another page on the same website.
• Example:    From www.goodfun.com/Art/glasspainting.html  to move to another file PencilSketching.html in the same directory,only PencilSketching.html will be required.

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