[PDF] 1. Is your browser running HTTP version 1.0 or 1.1? What version of





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1 The Basic HTTP GET-response interaction

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1 The Basic HTTP GET/response interaction

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1. Is your browser running HTTP version 1.0 or 1.1? What version of HTTP is the server

running? HTTP 1.1 (see screenshot)2. What languages (if any) does your browser indicate that it can accept to the server? en-US

(US English) as shown in prior screenshot

3. What is the IP address of your computer? Of thespinlab.wpi.eduserver? My computer

is 10.211.55.3 (this is a virtual IP address assigned by my virtual machine software) and the destination is 130.215.16.168. See prior screenshot.

4. What is the status code returned from the server to your browser? 200 OK (see prior screen-

shot)

5. When was the HTML le that you are retrieving last modied at the server? We can lter

messages byhttp.last_modifiedand we see that the HTTP response I received for the html 1 le doesn't show this eld. We do have ahttp.last_modifiedeld in the favicon response however, as shown in the screenshot below. This says the favicon was last modied on Feb

25, 2010.6. How many bytes of content are being returned to your browser? Content-length = 209 bytes.

See screenshot below.

2

7. By inspecting the raw data in the packet content window, do you see any headers within the

data that are not displayed in the packet-listing window? If so, name one. No. The raw data appears to match up exactly with what is shown in the packet-listing window.

8. Inspect the contents of the rst HTTP GET request from your browser to the server. Do you

see an \IF-MODIFIED-SINCE" line in the HTTP GET? No.

9. Inspect the contents of the server response. Did the server explicitly return the contents of

the le? How can you tell? See screenshot of response with Alice's Adventures... 3

10. Now inspect the contents of the second HTTP GET request from your browser to the server.

Do you see an \IF-MODIFIED-SINCE:" line in the HTTP GET? If so, what information follows the \IF-MODIFIED-SINCE:" header? Yes. If-Modified-Since: Wed, 12 Mar 2014 17:29:08 GMT\r\n.

See screenshot below.

4

11. What is the HTTP status code and phrase returned from the server in response to this second

HTTP GET? Did the server explicitly return the contents of the le? Explain. As seen in the previous screenshot, we get a HTTP/1.1 304 Not Modied Response. This is much shorter than the full response packet seen previously which contained all of Alice in Wonderland.

12. How many HTTP GET request messages were sent by your browser (again, ignoring requests

for favicon.ico)? Just one.

13. How many data-containing TCP segments were needed to carry the single HTTP response?

From the screenshot below, there are 4 TCP segments. 5

14. What is the status code and phrase associated with the response to the HTTP GET request?

HTTP/1.1 200 OK (as seen in previous screenshot)

15. Are there any HTTP status lines in the transmitted data associated with a TCP- induced

\Continuation"? No.

16. How many HTTP GET request messages were sent by your browser? To which Internet

addresses were these GET requests sent? Three: 130.215.16.168, 130.215.36.26, 208.122.28.10.

See screenshot below.

6

17. Can you tell whether your browser downloaded the two images serially, or whether they were

downloaded from the two web sites in parallel? Explain. Based on the timestamps, it appears the images were downloaded serially. Also, the source port is incrementing each time from

64444, 64445, 64446 which means that the images were received serially over separate TCP

connections.

18. What is the server's response (status code and phrase) in response to the initial HTTP GET

message from your browser? HTTP/1.1 401 Authorization Required (see screenshot below) 7

19. When your browser's sends the HTTP GET message for the second time, what new eld is

included in the HTTP GET message? Authorization eld. See screenshot below. 8

20. Copy the string of text that appears after \Authorization: Basic ", and enter it into the Base64

decoder here {http://www.motobit.com/util/base64-decoder-encoder.asp. Make sure to click on \decode". To what ASCII string does the Base64 string decode to? (Hint: you should see the username and password for the course website embedded in the string). No need since Wireshark has already done the decoding. See the previous screenshot. Our credentials are clearly visible in Wireshark. 9quotesdbs_dbs14.pdfusesText_20
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