3. Web cache 2+2+2 point Consider your access network employs a web cache (proxy server) that acts as a proxy web server for any HTTP request your Firefox/4.6.10 browser generates. Suppose that you are accessing a website http:l/aaia.cs.umass.edu/kurose ross/interactivelindex.pho that is hosted by a web server named as gaia.cs.umass.edul. Now, answer the following: a. Write down the necessary request line and header lines of the HTTP request message sent from your browser to the web cache assuming that your browser is using persistent HTTP. b. Upon getting the HTTP request from your browser, what does the web cache do when it has a copy of the following website in its locel cache (http:llaaia.cs.umass. edu/kurose ross/interactivelindex,phg)? c. Upon getting the conditional GET HTTP request from the web cache for the above website, what does the web server gaia.cs.umass.edu/ do