How web browsers request pages in Intro to Computing - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to show the first step a browser takes to request a web page.

Intro to Computing

browser sends a [1] to the server to ask for the page

Drag options to blanks, or click blank then click option'

Aerror

Bresponse

Crequest

Dcache

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'response' because it sounds like an answer, but the browser sends a request first.

Choosing 'cache' which is stored data, not the message sent.

The browser sends a request to the server to ask for the web page.

2fill in blank

medium

Complete the sentence describing what the server sends back after receiving a request.

Intro to Computing

The server sends a [1] containing the web page data back to the browser.

Drag options to blanks, or click blank then click option'

Aresponse

Bcache

Crequest

Derror

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'request' which is what the browser sends, not the server.

Choosing 'cache' which is stored data, not the message sent.

After receiving a request, the server sends a response with the web page data.

3fill in blank

hard

Fix the error in the description of the HTTP method used by browsers to request pages.

Intro to Computing

The browser uses the [1] method to ask the server for a web page.

Drag options to blanks, or click blank then click option'

APOST

BGET

CPUT

DDELETE

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'POST' which is used to send data to the server, not to request pages.

Choosing 'PUT' or 'DELETE' which are for updating or removing data.

The GET method is used by browsers to request web pages from servers.

4fill in blank

hard

Fill both blanks to complete the flow of how a browser requests and receives a page.

Intro to Computing

browser sends a [1] to the server and server replies with a [2]

Drag options to blanks, or click blank then click option'

Arequest

Bresponse

Cerror

Dcache

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up request and response.

Choosing 'error' or 'cache' which are not part of the normal request-response flow.

The browser sends a request and the server replies with a response.

5fill in blank

hard

Fill all three blanks to complete the description of the web page request process.

Intro to Computing

browser sends a [1] using the [2] method and receives a [3] from the server

Drag options to blanks, or click blank then click option'

Arequest

BGET

Cresponse

DPOST

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'POST' instead of 'GET' for requesting pages.

Confusing 'request' and 'response' roles.

The browser sends a request using the GET method and receives a response from the server.

Practice

1. What does a web browser send to a server when you type a website address and press Enter?

easy

A. A file containing the webpage

B. A command to shut down the server

C. A request asking for the webpage

D. A message to update the browser

Solution

1. Step 1: Understand browser-server interaction

   When you enter a website address, the browser needs to get the page from the server.

2. Step 2: Identify what the browser sends

   The browser sends a request to the server asking for the webpage data.

3. Final Answer:

   A request asking for the webpage -> Option C

4. Quick Check:

   Browser sends request [OK]

Hint: Browser always sends a request to get pages [OK]

Common Mistakes:

• Thinking browser sends the whole page first
• Confusing request with response
• Assuming browser sends commands to server

2. Which protocol do web browsers use to request pages from servers?

easy

A. HTTP or HTTPS

B. FTP

C. SMTP

D. POP3

Solution

1. Step 1: Recall common internet protocols

   FTP is for file transfer, SMTP and POP3 are for email.

2. Step 2: Identify protocols for web pages

   HTTP and HTTPS are designed for web page requests and responses.

3. Final Answer:

   HTTP or HTTPS -> Option A

4. Quick Check:

   Web pages use HTTP/HTTPS [OK]

Hint: Web pages use HTTP or HTTPS protocols [OK]

Common Mistakes:

• Confusing FTP with HTTP
• Mixing email protocols with web protocols
• Not recognizing HTTPS as secure HTTP

3. Look at this simplified flowchart of a browser requesting a page: 1. Browser sends request to server 2. Server checks if page exists 3. Server sends page if found, else sends error If the server does not find the page, what will the browser receive?

medium

A. An error message like 404 Not Found

B. A blank page with no message

C. The requested webpage content

D. A request to try again

Solution

1. Step 1: Follow the flowchart steps

   The server checks if the page exists after receiving the request.

2. Step 2: Understand server response if page missing

   If the page is missing, the server sends an error message like 404 Not Found.

3. Final Answer:

   An error message like 404 Not Found -> Option A

4. Quick Check:

   Missing page = error 404 message [OK]

Hint: Missing pages return 404 error messages [OK]

Common Mistakes:

• Assuming server sends blank page
• Thinking server asks browser to retry
• Confusing error with page content

4. A browser sends a request to a server but the page never loads. Which of these could be the problem?

medium

A. The user typed the address in uppercase letters

B. The browser sent the wrong page address

C. The browser is using HTTP instead of HTTPS

D. The server is offline or unreachable

Solution

1. Step 1: Analyze possible causes for no page load

   If the server is offline or unreachable, the browser cannot get any response.

2. Step 2: Evaluate other options

   Wrong address usually returns error, HTTP vs HTTPS usually still connects, uppercase letters do not prevent loading.

3. Final Answer:

   The server is offline or unreachable -> Option D

4. Quick Check:

   No response = server offline/unreachable [OK]

Hint: No page load often means server unreachable [OK]

Common Mistakes:

• Thinking uppercase letters break address
• Confusing HTTP and HTTPS connection issues
• Assuming wrong address causes no load instead of error

5. You want to explain how a browser requests a webpage and gets a response using a simple diagram. Which sequence correctly shows the steps?

hard

A. Server sends response -> Browser sends request -> Server processes response -> Browser displays page

B. Browser sends request -> Server processes request -> Server sends response -> Browser displays page

C. Browser sends response -> Server sends request -> Browser processes response -> Server displays page

D. Server sends request -> Browser processes request -> Browser sends response -> Server displays page

Solution

1. Step 1: Understand the communication flow

   The browser initiates by sending a request to the server.

2. Step 2: Follow the correct order of actions

   The server processes the request, sends back a response, and then the browser displays the page.

3. Final Answer:

   Browser sends request -> Server processes request -> Server sends response -> Browser displays page -> Option B

4. Quick Check:

   Request -> Process -> Response -> Display [OK]

Hint: Request starts at browser, response ends at browser [OK]

Common Mistakes:

• Reversing who sends request or response
• Mixing up processing and displaying steps
• Thinking server displays page