HTTP request and response

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Quick Questions

Shade in the A or B circle for each question.

1. Which message does the browser send when you click a link to open a page?

A An HTTP request

B An HTTP response

2. Which device sends the HTTP response?

A The web browser

B The web server

3. What does a successful HTTP response contain?

A The address of the user's computer only

B The HTML of the requested page

4. The web server cannot find the page that was asked for. What does it send back?

A An error response such as 404 page not found

B No reply, so the browser sends the page itself

5. Which statement about HTTP is correct?

A The browser sends a request and the server sends a response

B The server sends a request and the browser sends a response

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1GET /index.html HTTP/1.1		AGET /shop.html HTTP/1.1
2HTTP/1.1 404 Not Found		BHTTP/1.1 200 OK <html>...</html>
3The web server replies to a successful request with a response containing the page's HTML		C404 means the page was NOT found. A successful response uses 200 OK and contains the page's HTML.
4The browser starts the exchange by sending a request that names the page it wants		DAn HTTP request: the browser asks the web server for the page index.html
5The web server sends the HTTP request and the browser sends the HTTP response.		EThe roles are swapped: the browser sends the request and the web server sends the response.
6HTTP/1.1 404 Not Found means the page was found and sent back.		FAn HTTP error response: the web server cannot find the page that was requested

Definitions

HTTP request and response

Fill in the Blanks

Complete each line of code by filling in the missing parts.

___ /index.html HTTP/1.1

HTTP/1.1 ___ OK

HTTP/1.1 ___ Not Found

Browser sends an HTTP _______ to the server

browser -> server: HTTP request server -> browser: HTTP ________

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A browser sends HTTP request

B server receives the request

C server sends HTTP request

D browser displays the page

Question 2

A GIVE /about.html HTTP/1.1

B Host: www.school.com

C Accept: text/html

Question 3

A request = GET /shop.html

B page_exists = True

C status = 404

D send response with status

Question 4

A HTTP/1.1 200 Not Found

B Content-Type: text/html

C <h1>Page not found</h1>

Question 5

A browser sends request for page

B server looks for the page

C page is missing

D server sends 200 OK response

Answer Key

HTTP request and response

Section A: Quick Questions

A — An HTTP request

B — The web server

B — The HTML of the requested page

A — An error response such as 404 page not found

A — The browser sends a request and the server sends a response

Section B: Match the Pairs

GET /index.html HTTP/1.1 → An HTTP request: the browser asks the web server for the page index.html

HTTP/1.1 404 Not Found → An HTTP error response: the web server cannot find the page that was requested

The web server replies to a successful request with a response containing the page's HTML → HTTP/1.1 200 OK <html>...</html>

The browser starts the exchange by sending a request that names the page it wants → GET /shop.html HTTP/1.1

The web server sends the HTTP request and the browser sends the HTTP response. → The roles are swapped: the browser sends the request and the web server sends the response.

HTTP/1.1 404 Not Found means the page was found and sent back. → 404 means the page was NOT found. A successful response uses 200 OK and contains the page's HTML.

Section C: Definitions

HTTP request and response — The browser sends an HTTP request asking for a page. The web server sends back an HTTP response with the page's HTML, or an error such as 404 page not found.

Section D: Fill in the Blanks

GET /index.html HTTP/1.1

HTTP/1.1 200 OK

HTTP/1.1 404 Not Found

Browser sends an HTTP request to the server

browser -> server: HTTP request
server -> browser: HTTP response

Section E: Spot the Error

C — The web server answers with an HTTP response. The request is what the browser sends, so line 3 should be 'server sends HTTP response'.

A — GIVE is not an HTTP method. A browser asks for a page with GET, so the line should be 'GET /about.html HTTP/1.1'.

C — The page exists, so the server sends 200 (OK), not the 404 error. The line should be 'status = 200'.

A — The status code and the message must match. 404 means Not Found, while 200 means OK. The line should be 'HTTP/1.1 404 Not Found'.

D — The page is missing, so the server sends an error response (404 page not found). A 200 OK response is only sent when the page is found.