User server interaction - application layer , Computer Networking

User Server Interaction

Cookies of the world  wide  web  was originally designed  as a stateess entity. A client  sends a request and the server responds. Their  relationship  is over. The  original design  of www. Retrieving publicly available documents exactly fits this purpose. Today  the web  has other  functions some  are listen  here.

a.Some websites  need to  allow access to registered clients  only.

b.Websites  are begins used as  electronic  stores  that allows users  to browse  through  the  store  select  wanted  items  put them  in an electronic  cart and path  end with  a credit  card.

c.Some  websites  are used as portals the user selects the  web pages  which  he wants to see.

d.Some  website are just  advertising.

For these  purpose, the  cookies  mechanism  introduced. Cookies are more  commonly  referred to as web  cookies  tracking or just  cookies are parcels of next  sent by  a server to a  web  client ( usually a browser) and then  sent back  unchanged by the client  each  time it  accesses that server. Cookies are used  for authenticating  session tracking state  maintenance and maintaining  specific information  about  uses  such as site  preference  or the  contents  of their electronic  shopping carts.

Cookies technology  has four  components:

a.a cookie header line  in the HTTP response  message.

b.A cookie  header line in the HTTP request  message.

c.A cookie  file kept  on the user end system  and managed by the user browser .

d.A back end database  at the website.

Let go through  an example  of how  cookies  are used. Suppose  Hassan who  always  access the web using  internet explorer from his home PC contacts and  e commerce site for the first time and this site  uses cookies. When  the request comes into the web server the web site  creates a unique identification number and creates an entry in its back end  database that is indexed by the  identification number. The server then  responds  to  Hassan browser including  in the HTTP response  a set cookie. Header which  contains  the identification  number. For example  the header lien might  be:

 

 

Posted Date: 3/7/2013 12:23:50 AM | Location : United States







Related Discussions:- User server interaction - application layer , Assignment Help, Ask Question on User server interaction - application layer , Get Answer, Expert's Help, User server interaction - application layer Discussions

Write discussion on User server interaction - application layer
Your posts are moderated
Related Questions
Hypercube Network The hypercube architecture has played a vital role in the development of parallel processing and is still not much popular and influential. The highly symmetr

Q. Show Upper Layers of tcp-ip model? The Session Layer - The Session layer allows two parties to hold ongoing communications called a session across a network. - Not

Question 1: (a) In the context of an information system, distinguish and relate among the terms: data, information and decision-making. (b) Describe at least two chall

Question: a) Describe the triangular delivery and two crossing problem that appears in Mobile IP. b) Discovery, Registration and Tunneling are three basic capabilities of Mo

Questions: A signal of amplitude 10 mV is fed to the amplifier in the figure. What is the amplitude of the voltage at the output from the amplifier?

What is Network Server? Network Server is a computer in Network that is designated to give one or more network service. For instance file server, database server etc.

Tree interconnection network:   In tree interconnection network, processors are organised in a complete binary tree pattern. Figure: Tree interconnection network

Consider figure.  Assume a new flow E is added that takes a path from R1 to R2 to R6. How does the max-min bandwidth allocation change for the 5 flows?

What is backbone network? A backbone network is a centralized infrastructure that is intended to distribute dissimilar routes and data to various networks. It also handles mana

- Light source is LED (light-emitting diode) or a laser - LEDs are cheaper however not as precise (unfocused) limited to short-distance use - Lasers is able to have a narrow