How web browsers request pages in Intro to Computing - Flowchart Walkthrough

Process Overview

This flowchart shows how a web browser asks a web server for a web page and gets it back. It explains the steps from typing a website address to seeing the page on your screen.

Flowchart

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This flowchart shows the step-by-step process of how a web browser requests a web page: starting from the user typing a URL, checking cache, resolving the IP address via DNS, sending the HTTP request, receiving the response, and finally displaying the page.

Step-by-Step Trace - 9 Steps

Step 1: User types 'example.com' in the browser address bar.

Step 2: Browser checks if 'example.com' page is in its cache.

Step 3: Page is not in cache, so browser sends a request to DNS server.

Step 4: DNS server returns the IP address of the web server hosting 'example.com'.

Step 5: Browser sends an HTTP request to the web server at the IP address.

Step 6: Web server receives the request and processes it.

Step 7: Web server sends an HTTP response with the web page data.

Step 8: Browser receives the page data.

Step 9: Browser renders the page on the screen.

Diagram

User
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Browser
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Cache
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DNS Server
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Internet
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Web Server
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Browser
  |
User Screen

This diagram shows the main components involved: the user interacts with the browser, which checks cache, then asks the DNS server for the IP address, sends a request over the internet to the web server, receives the page, and finally displays it on the user's screen.

Flowchart Quiz - 3 Questions

What does the browser check first after typing a URL?

A The IP address from DNS

B If the page is in cache

C Send HTTP request to server

D Render the page

Key Result

A web browser first checks cache, then uses DNS to find the server's IP, sends an HTTP request, and finally renders the received page.