Networking - HTTP

Please answer the quiz and click the "Test" button at the bottom right.

Given the following request message for some HTML page, answer the questions below.

GET ../../6.031/www/fa17/classes/24-sockets-networking/ HTTP/1.1
Host: web.mit.edu
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Keep-Alive: 300
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document

Question 1

What is wrong in the request?

You can't perform a GET request for an HTML pages
An HTML page is requested, but the client doesn't accept HTML content type
The Host header must start with http://
The specified resource must be an absolute path (starts with /)

Question 2

For how long the client persists the TCP connection over which requests and responses will be transferred?

Forever, as she uses keep-alive connection type
For 300 minutes, as specified in Keep-Alive header
For 300 seconds, as specified in Keep-Alive header
The connection is terminated immediately after a successful response from the server.

Question 3

The server uses HTTP/2. Choose the correct statement:

The request will fail since the client uses HTTP/1.1
The client and server might use different versions of the HTTP protocol
The request will succeed if the client will emit the HTTP version from the first line
The client should send a GETVERSION request to get the server HTTP version

Question 4

Assume the above request was responded with an HTML page consisting of some text and three images.

Consider the following statement:

For this page, the client will send one request message and receive four response messages.

True, this is the expected behavior in HTTP/1.1
True, as she uses the Keep-Alive header
False, the text including the three images will be sent on the same response of the original message
False, the browser will perform other three HTTP requests, one per image

Question 5

Assume the server response status code is 408. Choose the most likely root cause for this response.

The client sent a HEAD request
The client machine is overloaded
The server is down
The server already served this resource to this client

Question 6

Assume the server response status code is 500. How can you advise the client?

Perform the request with Connection: close header.
Nothing can help as this code indicates a server side error, the client can try again later.
Check the resource path.
Send the request over HTTPS.

Question 7

Assume the RES bash variable contains the response status of some request. Which condition will catch all possible failures (both client and server)?

response_code != 200
response_code > 200
response_code < 500
response_code >= 400