HTTP Requests & Responses
Understand the foundational HTTP protocol, learning how browsers communicate with web servers and how to emulate these interactions.
HTTP Requests & Responses is a free Web Scraping & Bots lesson on CoddyKit — lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Web Scraping & Bots learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Welcome to HTTP!
HTTP — Hypertext Transfer Protocol — is the web’s language. It’s the rules your code and scrapers use to talk to web servers and fetch data.
Client-Server Chat
HTTP follows a client-server model: your browser (client) asks for pages, the website’s machine (server) stores and sends them back.
Making an HTTP Request
Type a URL and hit Enter, and your browser fires an HTTP request — a message asking the server for a specific resource like a page or image.
Anatomy of a Request
An HTTP request has structure: a method (the action), a URL, headers (extra context like your browser), and an optional body for data.
GET: Fetching Data
GET is the scraper’s workhorse — it retrieves data. Visiting a page sends a GET request for that page’s HTML.
POST: Sending Data
POST sends data to the server — think logging in, submitting a comment, or uploading a file. Your browser posts that data up.
Demo: A Conceptual Request
Here’s the shape of a basic GET request, printed for illustration. We’re just showing the structure, not actually sending it over the network.
def main():
# This is what an HTTP GET request looks like conceptually:
method = "GET"
path = "/index.html"
http_version = "HTTP/1.1"
host = "www.example.com"
user_agent = "CoddyKit-Scraper/1.0"
print(f"{method} {path} {http_version}")
print(f"Host: {host}")
print(f"User-Agent: {user_agent}")
print("Connection: close")
print("") # Blank line separates headers from body
if __name__ == "__main__":
main()The Server's Response
The server processes your request and sends back a response — the data you asked for (like HTML) plus info on whether it succeeded.
Response Status Codes
Every response carries a status code: 200 OK, 404 Not Found, 301 Moved, 500 Server Error. It tells you the outcome at a glance.
Why Emulate Browsers?
Scrapers often emulate a browser — sending requests that look like a real one. Correct methods and headers help you avoid getting blocked.
Quick Check: HTTP Flow
When you type a URL into your browser, what is the FIRST thing your browser typically sends to the web server?
Recap: HTTP Fundamentals
Solid foundation! You’ve got the client-server model, HTTP requests (GET, POST) and responses, status codes, and why scrapers emulate browsers.
Frequently asked questions
Is the “HTTP Requests & Responses” lesson free?
Yes — the full text of “HTTP Requests & Responses” is free to read here on the web, and the Web Scraping & Bots course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Web Scraping & Bots course, upgrade to CoddyKit PRO.
What will I learn in “HTTP Requests & Responses”?
Understand the foundational HTTP protocol, learning how browsers communicate with web servers and how to emulate these interactions. You practise Web Scraping & Bots with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Web Scraping & Bots?
No prior experience is required. Web Scraping & Bots on CoddyKit is structured for beginners through advanced learners; this is — lesson 2 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “HTTP Requests & Responses” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Web Scraping & Bots lesson?
Yes. Every Web Scraping & Bots lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- What is Web Scraping?
- HTTP Requests & Responses
- Inspecting Web Pages
- Robots.txt & Scraping Ethics