1.a.There are two types of file that is generated in the cookie mechanism. Two files get generated one in client side and one in the server side. In the client side a vendor file gets generated with a cookie id 12343 and on the server side a customer file gets generated with the same cookie id. The server side is the one that deals with all the responses generated , and the client side generate cookies with every request made. The first response that get stored in the vendor file is after getting the response from the server and the server file gets data after the first request made. Whenever the server responses for the request made by the client with the help of this cookie , the server gets updated with each response generated by the server in the user file. The Id gets updated with details they are proceeding. The last detail that will be stored in response with the cookie mechanism in this case is the order confirmation received by the customer for the particular product.
The mechanism involved in the working of cookie in online shopping is firstly the user requests the page to direct to a particular site. The cookies are set using Set-Cookie in HTTP header and in response from web server. This header is used to direct the web browser to store the cookie and is used in future when the client requests for the same browser. In this the client request the cookie to direct the web browser to a site that will list all the all the best toys details. The user requests the server for the details. In response to this request the web browser returns the search and provides page with details about all the best toys available. The response contains all the contents of the requested websites homepage. In addition to this , the browser s instructed to set two cookies for this. The first one is known as the session cookie. In this step, the session cookie is generated. The session cookie is created and it is deleted when the client shuts down the program or backs from the page, as there is no particular expiry time for the session cookie. However, the session cookie gets permanent when the browser is used for session restoring. The second one is the session token, this is considered to be a persistent cookie as it contains an max age attribute, this instructs the browser to remove the cookie at a fixed time and date.
In the next step the browser, send a request again for getting the image on the website. The request sent to the browser contains a cookie with a HTTP header. The server on receiving the request knows that this is related to the previous request made. The server responds accordingly and sends cookie to the page that is requested by the user. This includes more Set- Cookie headers, so that they can proceed with the request made by the user and adds new cookie to server or modifies the existing one. In this, the user requests the server to provide the images related to best toys they are planning to buy online. In response to the request made by the user, the page responds with the website that shows the price along with the images. The user can modify the cookie by adding a Set-Cookie in response to the page request. The browser further replaces the old cookie value with the new value.
In the final step, the user requests the server to get the payment details so that they can proceed with the payment. The cookie is generated and knows that the server is requesting for the payment details that are related to the last search made. The server proceeds with setting the cookie and response accordingly. The requested server responses with conforming the item and proceeds with the payment required to be made with the item.
b.When the advertising company shows banner ads in the university website and the hyperlink is clicked by the user the user is redirected to the advertising company webpage and cookie is stored in the web server. The demonstration of the working of the website is given in the diagram. Two website pages are created and it is connected with two of the server and the client request from the server with a cookie and the cookie is passed to the advertising server such that the user can be tracked.
2.As Web browsers and web servers function together as a Client-Server system. They communicate via TCP. This communication consists of three parts 1.Connection Establishment 2.Data Transfer 3.Connection Termination.
The following diagram analyzes the steps used for transmission of data.
Thus in this way the three process are completed.
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