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Figure 272 Browser
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The Web page is stored at the server Each time a client request arrives, the corresponding document is sent to the client To improve efficiency, servers normally store requested files in a cache in memory; memory is faster to access than disk A server can also become more efficient through multithreading or multiprocessing In this case, a server can answer more than one request at a time
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A client that wants to access a Web page needs the address To facilitate the access of documents distributed throughout the world, HTTP uses locators The uniform resource locator (URL) is a standard for specifying any kind of information on the Internet The URL defines four things: protocol, host computer, port, and path (see Figure 273)
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Host
The protocol is the client/server program used to retrieve the document Many different protocols can retrieve a document; among them are FTP or HTTP The most common today is HTTP The host is the computer on which the information is located, although the name of the computer can be an alias Web pages are usually stored in computers, and computers are given alias names that usually begin with the characters "www" This is not mandatory, however, as the host can be any name given to the computer that hosts the Web page The URL can optionally contain the port number of the server If the port is included, it is inserted between the host and the path, and it is separated from the host by a colon Path is the pathname of the file where the information is located Note that the path can itself contain slashes that, in the UNIX operating system, separate the directories from the subdirectories and files
Cookies
The World Wide Web was originally designed as a stateless entity A client sends a request; a 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 listed here
I Some websites need to allow access to registered clients only
2 Websites are being used as electronic stores that allow users to browse through the store, select wanted items, put them in an electronic cart, and pay at the end with a credit card 3 Some websites are used as portals: the user selects the Web pages he wants to see 4 Some websites are just advertising For these purposes, the cookie mechanism was devised We discussed the use of cookies at the transport layer in 23; we now discuss their use in Web pages Creation and Storage of Cookies The creation and storage of cookies depend on the implementation; however, the principle is the same
WWW AND HTTP
1 When a server receives a request from a client, it stores information about the client in a file or a string The information may include the domain name of the client, the contents of the cookie (information the server has gathered about the client such as name, registration number, and so on), a timestamp, and other information'depending on the implementation 2 The server includes the cookie in the response that it sends to the client 3 When the client receives the response, the browser stores the cookie in the cookie directory, which is sorted by the domain server name
Using Cookies
When a client sends a request to a server, the browser looks in the cookie directory to see if it can find a cookie sent by that server If found, the cookie is included in the request When the server receives the request, it knows that this is an old client, not a new one Note that the contents of the cookie are never read by the browser or disclosed to the user It is a cookie made by the server and eaten by the server Now let us see how a cookie is used for the four previously mentioned purposes: 1 The site that restricts access to registered clients only sends a cookie to the client when the client registers for the first time For any repeated access, only those clients that send the appropriate cookie are allowed 2 An electronic store (e-commerce) can use a cookie for its client shoppers When a client selects an item and inserts it into a cart, a cookie that contains information about the item, such as its number and unit price, is sent to the browser If the client selects a second item, the cookie is updated with the new selection information And so on When the client finishes shopping and wants to check out, the last cookie is retrieved and the total charge is calculated 3 A Web portal uses the cookie in a similar way When a user selects her favorite pages, a cookie is made and sent If the site is accessed again, the cookie is sent to the server to show what the client is looking for 4 A cookie is also used by advertising agencies An advertising agency can place banner ads on some main website that is often visited by users The advertising agency supplies only a URL that gives the banner address instead of the banner itself When a user visits the main website and clicks on the icon of an advertised corporation, a request is sent to the advertising agency The advertising agency sends the banner, a GIF file, for example, but it also includes a cookie with the ill of the user Any future use of the banners adds to the database that profiles the Web behavior of the user The advertising agency has compiled the interests of the user and can sell this information to other parties This use of cookies has made them very controversial Hopefully, some new regulations will be devised to preserve the privacy of users
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