Consider the following web address: http://www.owu.edu/~stmccull/cs103/owu. html For each of the following parts of the above address, show what it signifies. Is it a file, a folder, a name for a machine? What happens if we change it to something else? What would our web browser try to do then? http www.owu.edu ~stmccull cs103 owu.html
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- HTTP 1.0 GET with an embedded object. Suppose an HTTP client makes a request to the gaia.cs.umass.edu web server. The client has never before requested a given base object, nor has it communicated recently with the gaia.cs.umass.edu server. You can assume, however, that the client host knows the IP address of gaia.cs.umass.edu. Suppose also that after downloading the base file, the browser encounters a jpeg object in the base html file that is stored on gaia.cs.umass.edu, and therefore makes another GET request to gaia.cs.umass.edu for that referenced jpeg object. How many round trip times (RTTs) are needed from when the client first makes the request to when the base page and the jpeg file are completely downloaded, assuming the time needed by the server to transmit the base file, or the jpeg file into the server's link is (each) equal to 1/2 RTT and that the time needed to transmit the HTTP GET into the client's link is zero? You should assume that HTTP 1.0 is being used.…HTTP 1.1 GET with an embedded object. Suppose an HTTP client makes a request to the gaia.cs.umass.edu web server. The client has never before requested a given base object, nor has it communicated recently with the gaia.cs.umass.edu server. You can assume, however, that the client host knows the IP address of gaia.cs.umass.edu. Suppose also that after downloading the base file, the browser encounters a jpeg object in the base html file that is stored on gaia.cs.umass.edu, and therefore makes another GET request to gaia.cs.umass.edu for that referenced jpeg object. How many round trip times (RTTs) are needed from when the client first makes the request to when the base page and the jpeg file are completely downloaded, assuming the time needed by the server to transmit the base file, or the jpeg file into the server's link is (each) equal to 1/2 RTT and that the time needed to transmit the HTTP GET into the client's link is zero? You should assume that persistent HTTP 1.1 is being used.…2.2-6 A detailed Look at an HTTP GET (2). Again, suppose a client is sending an HTTP GET request message to a web server, gaia.cs.umass.edu. The client-to-server HTTP GET message is the following (same as in previous problem): GET /kurose_ross_sandbox/interactive/quotation2.htm HTTP/1.1Host: gaia.cs.umass.eduAccept: text/plain, text/html, text/xml, image/jpeg, image/gif, audio/mpeg, audio/mp4, video/wmv, video/mp4,Accept-Language: en-us, en-gb;q=0.1, en;q=0.7, fr, fr-ch, da, de, fiIf-Modified-Since: Wed, 09 Sep 2020 16:06:01 -0700User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11What is the language in which the client would least prefer to get a response? [You may have to search around the Web a bit to answer this.] [Note: you can find additional questions similar to this here.]
- Consider the following HTTP request message (Note. Cr means carriage return and lf means line feed) GET /cs453/index.html HTTP/1.1<cr><lf> Host: gaia.cs.umass.edu<cr><lf> User-Agent: Mozilla/5.0 ( Windows;U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) <cr><lf> Accept:ext/xml, application/xml, application/xhtml+xml, text /html;q=0.9, text/plain;q=0.8,image/png,*/*;q=0.5 <cr><lf> Accept-Language: en-us,en;q=0.5<cr><lf> Accept-Encoding: zip,deflate<cr><lf> Connection:keep-alive<cr><lf><cr><lf> What is the URL of the document requested by the browser? What version of HTTP is the browser running? Does the browser request a non-persistent or a persistent connection?Assume that there is a function in a web application that allows users to change theircurrent email address to a new one.The following is an example of a HTTP POST request that will be sent to the vulnerableweb application when the user tries to perform email change action:POST usr/emailchange.php HTTP/1.1Host: example.comConnection: Keep-AliveCookie: session=abcwsdagePkBZzeR9hGhTlvxyHfsZf1The following is the parameter for the email in the POST request:Form Dataemail=example@utas.edu.au(a) Design an CSRF attack to exploit the existing vulnerability by creating an HTMLpage with the required method, URL, parameters and action to change the emailwhen the victim hits the URL of this webpage. Assume that there are no preventiontechniques implemented.(b) What will happen if the victim hits your code in (a) when he/she authenticatedalready?(c) What will happen if the victim hits your code in (a) when he/she not authenticatedalready?Answer the Qusetion: “The Java URL class represents an URL. URL is an acronym for Uniform Resource Locator.It points to a resource on the World Wide Web”With reference to the above context, please answer the following:a) Write the full java program to get the protocol name, host name and port name of any URL of your choice for example:“https://www.tutorialspoint.com/java/java_applet_basics.htm " b) Explain the different constructors in java.net.URL package using the code snippets. c) Discuss the exception thrown when creating a URL for an unknown protocol. d) Write a code in Java to find the InetAddress of a machine , InetAddress of host of any URL of your choice for example: “www.tutorialspoint.com” website. Give any two methods.
- The URL Connection class can be used to read and write data: Select one: a.To the specified resource referred by the HttpResponse and the URL b.To the specified resource referred by the URL c.To the specified resource referred by the HttpServer and the URL d.To the specified resource referred by the ServerSocket and the URLUsing the domain name www.practice.com, construct the URL for a file called history.html in a folder called About_Us, which is in the web root directoryWe are going to look at an interesting program: rball.py - a simulation of a racquetball game, which combines most of concepts we've learned covered by Chapter 1-8. from: https://mcsp.wartburg.edu/zelle/python/ppics3/code/chapter09/rball.py, (We recommend you to use Chrome as web browser to open this link). 3. Copy/paste this rball.py file on your Python IDLE, run it to see how it works, if needed, read the textbook Chapter 9. This program uses what we learned so far to simulate a game. When running it, make sure to "interact" with it by INPUTTING percentage of the probability a player could win, e.g.: 0.78 4. To earn pts, 1) Run this program successfully with reasonable inputs and outputs; 2) Add more comments to the program to explain each line of statements by using # sign. Keep same alignment for each line of code and comment. 3) Revise this rball.py program a little bit by moving the main() function to bottom of this program, in other words, make the main() function as the last…
- Suppose we have a web site outside of xamp\httdocs and we want to access it fromour web server. Configure this directory with any alias that you want.For example: we have a site in the httdocs called www.test.com and another folderin /home/homework. We want to access the homework in this way:www.test.com/homeworkSuppose within your Web browser you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your localhost, so a DNS lookup is necessary to obtain the IP address. Suppose that n DNS servers are visited before your host receives the IP address from DNS; the successive visits incur an RTT of RTT1, . . ., RTTn. Further suppose that the Web page associated with the link contains exactly one object, consisting of a small amount of HTML text. Let RTT0 denote the RTT between the local host and the server containing the object. Assuming zero transmission time of the object, how much time elapses from when the client clicks on the link until the client receives the object? Justify your answer.1. Start up your web browser and go to the http://gaia.cs.umass.edu/wireshark-labs/alice.txt and retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer2. Next go to http://gaia.cs.umass.edu/wireshark-labs/TCP-wireshark-file1.html. You will find a form to upload the text file.3. Use the browse button in this form to enter the name of the file on your computer containing Alice in Wonderland. Don’t yet press the “Upload alice.txt file” button in the form4. Now start up Wireshark and begin packet capture.5. Returning to your browser press the “Upload alice.txt file” button in the form to upload the file to the gaia.cs.umass.edu server. Once the file has been uploaded, a short congratulations message will be displayed in your browser window.6. Stop the Wireshark packet captureAnswer the following questions:1. What is the IP address and TCP port number used by client computer (source) that is transferring the file to gaia.cs.umass.edu?2. What is the IP…