User server interaction - application layer , Computer Networking

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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:

 

 


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