What HTTP Is
Learn how HTTP and HTTPS power communication on the Web. Understand requests, responses, clients, servers, web resources, APIs, status codes, security, and the tools developers use to inspect and troubleshoot web communication.
Every time you open a website, submit a form, load an image, or interact with an online application, communication is taking place between your device and servers across the Internet.
In this course, you will learn how HTTP (Hypertext Transfer Protocol) makes that communication possible. You will explore how clients and servers communicate through HTTP requests and responses, how browsers retrieve HTML, CSS, JavaScript, images, videos, fonts, and other resources, and why loading a single webpage can involve many different requests to multiple servers.
You will also be introduced to HTTP methods, status codes, APIs, request and response information, and the role HTTP plays in modern web applications. You will learn why traditional HTTP does not provide encrypted communication and how HTTPS uses TLS to protect information travelling between clients and servers.
Finally, you will see how web developers inspect HTTP activity using browser developer tools and how understanding HTTP can help diagnose common problems such as missing resources, failed requests, server errors, authentication issues, and HTTPS problems.
By the end of the course, you will have a strong foundation in how information moves across the Web and why HTTP and HTTPS are essential technologies for modern web development.
Curriculum
- Learning Objectives
- HTTP Is a Protocol for Web Communication
- HTTP Is Not the Internet
- HTTP Is Closely Connected to the World Wide Web
- HTTP Uses Clients and Servers
- The Browser Sends an HTTP Request
- Request and Response Form the Basic HTTP Cycle
- HTTP Can Request HTML
- HTTP Can Request CSS
- HTTP Can Request JavaScript
- HTTP Can Transfer Images, Fonts, Videos, and Files
- One Webpage Can Generate Many HTTP Requests
- Websites Can Communicate With Multiple Servers
- HTTP Requests Contain More Than a URL
- HTTP Responses Also Contain Structured Information
- HTTP Does Not Define Everything the Server Does
- HTTP Can Be Used by More Than Browsers
- HTTP Is Used Heavily by APIs
- HTTP Methods Describe Actions
- HTTP Uses Status Codes
- HTTP by Itself Does Not Encrypt Communication
- HTTPS Still Uses HTTP
- HTTP Communication Happens Extremely Quickly
- Developers Can Inspect HTTP Communication
- HTTP Problems Are Common in Web Development
- Why Web Developers Need to Understand HTTP
- Practical Example: Loading a Simple Webpage
- Key Terms
- Lesson Summary
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- Adel
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