Question

Need help to answer these two questions please

Describe how Web caching can reduce the delay in receiving a requested object. Will Web caching reduce the delay for all objects requested by a user or for only some of the objects? Why?

What is the purpose of the HTTP “COOKIE:” field? Are the values in the HTTP message’s cookie field stored at the client or server or both? Explain briefly.

Answer 1

1) Web Caching

The process of storing dynamically generated data for reuse and leaving data close to end user is known as web caching

In HTTP a client can send single request to server, in other hand a pipelining allow clients to send multiple requests to server over TCP but not always

Web Caching can reduce time required to get reply for request that client send ‘s. The server closer to client stores the object that client requested. If server has object stored that client requested, server will send stored object directly and delay will be reduced. If requested object doesn’t present at server the server forward the requested object to server’s origin and wait for reply which causes delay. So we can conclude that for all client requested object delay can’t be reduced as it depends on if server’s origin has reply or not

2) HTTP cookie

HTTP cookies are known as web cookies are messages given to browser by web server. Browser stores message in text file and that data will be used by browser to identify the users and prepare customized web pages. For example when you are filling your personal information that data will be stored in cookies, next time when you open the same page the browser send cookie data to server

Cookie parameters: Cookie name, cookie value, cookie expiration date, and path to which cookies are valid for web pages.

Let us consider an example, if a client uses same cookie every time   he opens a website, that website will track all the actions of client with that cookie. Hence we can conclude that HTTP messages cookie values will be stored both at client and server