Check the PDF for assignment.Microsoft Word - Assign2-HTTP.docx Assignment 2 – HTTP ü...

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Check the PDF for assignment.Microsoft Word - Assign2-HTTP.docx Assignment	2	–	HTTP	 	 ü Submit	ONLY	answers	as	a	SINGLE	PDF	file.	Check	blackboard	for	the	due	date.	 ü Total	3	questions,	120	points.	 	 1. HTTP	Caching	(20	points)	 Read	this	link	regarding	“different	kinds	of	cahces”.	You	can	also	do	additional	researching	regarding	the	 types	of	HTTP	caching.	IN	YOUR	OWN	WORDS,	summarize	what	you	have	read	on	the	types	of	HTTP	 caching	(mainly,	Private	browser	caches	and	Shared	proxy	caches).	You	can	just	use	words,	draw	 diagrams	etc.	Also,	mention	for	the	types	of	HTTP	caching	what	would	be	the	pros	and	cons	for	each.	 	 The	figure	below	is	for	Problems	2	and	3.	(Total	100	points)	 	 	 2. The	HTTP	GET	message	(Total	40	points)	 Consider	the	figure	above,	where	a	client	is	sending	an	HTTP	GET	message	to	a	web	server,	 www.kean.edu.	Suppose	the	client-to-server	HTTP	GET	message	is	the	following:	 GET http://kean.edu/~compsci/people/faculty.html HTTP/1.1  Host: www.kean.edu  Accept: text/plain, text/html, image/png, image/gif, audio/mp4,  audio/mpeg, video/wmv, video/mpeg  Accept-Language: en-us;q=0.8, en-gb;q=0.5, fr;q=0.2, fr-ch;q=0.2,  zh;q=0.1, de;q=0.1, ar;q=0.1, cs;q=0.1  If-Modified-Since: Mon, 25 Feb 2018 09:00:00 -0800  User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)  AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132  Safari/537.36  	 Answer	the	following	questions:		 A. What	is	the	name	of	the	file	that	is	being	retrieved	in	this	GET	message?	(2	pnts)	 B. What	version	of	HTTP	is	the	client	running?	(2	pnts)	 C. What	formats	of	text,	images,	audio,	and	video	does	the	client	browser	prefer	to	receive?	[Note:	for	 this	and	the	following	questions	on	browser	media	and	language	preferences,	you	will	need	to	do	a	 bit	of	additional	reading	on	the	Web.	Here	is	a	good	place	to	start.]	(4	pnts)	 D. What	languages	is	the	browser	indicating	that	it	is	willing	to	accept?	(4	pnts)	 E. What	is	the	meaning	of	the	"relative	quality	factor,"	q,	associated	with	the	various	version	of	 English?	[Note:	Here	and	Here	is	a	good	place	to	start.	See	also	RFC	2616]	(8	pnts)	 F. What	is	the	client's	preferred	version	of	English?	Why.	(4	pnts)	 G. Does	the	client	prefer	Swiss	French	over	traditional	French?	Why.	(4	pnts)	 H. Does	the	client	already	have	a	(possibly	out-of-date)	copy	of	the	requested	file?	Explain.	If	so,	 approximately	how	long	ago	did	the	client	receive	the	file,	assuming	the	GET	request	has	been	 issued	when	you	are	solving	this	problem?	(8	pnts)	 I. What	is	the	type	of	client	browser	and	the	client's	operating	system?	[Note:	To	answer	this,	you'll	 need	to	understand	the	User	Agent:	header	field.	Here	is	a	good	place	to	start.]	(4	pnts)	 	 3. The	HTTP	RESPONSE	message	(Total	60	points)	 Consider	the	figure	above,	where	the	server	is	sending	a	HTTP	RESPONSE	message	back	the	client.	 Suppose	the	server-to-client	HTTP	RESPONSE	message	is	the	following:	 HTTP/1.1 200 OK  Date: Mon, 25 Feb 2018 18:00:00 +0000  Server: Apache/2.2.3 (CentOS)  Last-Modified: Thu, 01 Feb 2018 18:00:00 +0000  ETag: “12345-abc-67890”  Content-Length: 2635  Keep-Alive: timeout=23, max=10  Connection: Keep-alive  Content-type: text/html  	 Answer	the	following	questions:		 A. What	version	of	HTTP	is	the	response?	(3	pnts)	 B. Was	the	server	able	to	send	the	document	successfully?	Explain	(3	pnts)	 C. At	what	date	and	time	was	this	response	sent?	(3	pnts)	 D. When	was	the	file	last	modified	on	the	server?	(3	pnts)	 E. How	many	bytes	are	there	in	the	document	being	returned	by	the	server?	(3	pnts)	 F. What	is	the	default	mode	of	connection	for	HTTP	protocol?	Is	the	connection	in	the	reply	persistent	 or	non-persistent?	Explain.	(6	pnts)	 G. What	is	the	type	of	file	being	sent	by	the	server	in	response?	(3	pnts)	 H. What	is	the	name	of	the	server	and	its	version?	(3	pnts)	 I. What	is	the	timeout	value	for	the	response	message?	(3	pnts)	 J. Is	the	connection	dropped	or	kept	open	after	the	timeout?	(3	pnts)	 K. What	are	the	maximum	number	of	requests	and	responses	the	server	has	allowed?	What	happens	 when	the	maximum	number	of	requests	and	responses	are	sent?	(3	pnts)	 L. What	is	ETag	in	the	response	message?	State	its	significance?	[Note:	To	answer	this	and	the	 question	below,	you'll	need	to	have	basic	understanding	of	ETag.	Here,	Here	(First	7	paragraphs	for	 HTTP	Caching	and	ETag),	Here	(section	‘Different	kinds	of	caches’	and	section	‘ETag’),	Video	(First	5	 minutes)	is	a	good	place	to	start.]	(12	pnts)	 M. Assume	the	client	host	requests	the	same	page	and	sent	a	HTTP	GET	request	with	If-None- Match: “12345-abc-67890” and	the	server	resources	(ETag)	did	not	change.	The	server	will	 then	reply	with	status	code	304 Not Modified and	Content-Length: 0.		What	does	this	 mean	and	why	is	it	beneficial?	[Note:	Here	(press	cancel	if	link	asks	for	credentials)	and	Here	will	 help.]	(12	pnts)

Neha · Accepted Answer

Q1) HTTP Caching
 Private Browser caches
 This type of cache is dedicated to a single user only. This cache holds all the documents downloaded from the browser by user. This cache allows the user to navigate back and forward, save, view as source and many other operations on the available data without adding any extra trip to the server. It also improves the offline browsing experience. 
The disadvantages of this caching are that it does not utilize some inbuilt features of the browser. The computer is always visible to the sites we visit and there is nothing to be called as private. 
Shared Proxy caches
This cache stores the responses which can be reused by multiple users. This helps in reducing the network traffic and latency. For example, an ISP set up a web proxy which serve multiple users so that popular resources can be used n number of times.  
The cons of this caches are that the data can be leaked using TLS and SSL techniques and blocked websites can be accessed.
Q2)
A)  Name of the file – http://kean.edu/~compsci/people/faculty.html
B) Version - HTTP 1.1
C) Text -plain, html
    Image – png, gif
    Audio – mp4, mpeg
    Video – wmv,

Microsoft Word - Assign2-HTTP.docx Assignment2–HTTP ü SubmitONLYanswersasaSINGLEPDFfile.Checkblackboardfortheduedate. ü Total3questions,120points. 1. HTTPCaching(20points)...

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