Build a Web Server from Scratch in Python | Socket Programming + TCP Explained

Published: 19 February 2026
on channel: SidCode - by Siddhant Saxena

Welcome to SidCode AI 🚀

In this video, we build a Web Server from Scratch using Python Socket Programming and TCP Connections.

This tutorial is perfect for:

Backend developers
Computer Science students
Placement preparation
System design beginners

Topics covered:

✅ What happens when you type a URL in browser
✅ HTTP Request / Response lifecycle
✅ Client-Server Architecture
✅ What is Socket?
✅ IP Address + Port Number
✅ TCP 3-Way Handshake
✅ TCP vs UDP
✅ Server Lifecycle (Socket → Bind → Listen → Accept)
✅ Build Python Server from scratch
✅ Build Python Client from scratch
✅ Serve HTML via browser

By the end, you’ll deeply understand:

How browsers communicate with servers
How backend servers work internally
How HTTP works at low level
Why TCP is used in web communication

Tech Stack:

Python
Socket Programming
TCP/IP
HTTP

This is extremely useful for:

Backend interviews
Networking concepts
System design fundamentals
OS / CN exam prep

🌐 Website: https://sidcode-ai.vercel.app

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Backend Engineering
System Design
GenAI
Coding Interview Prep
CS Fundamentals
Timestamps

0:00 Intro
0:08 What happens when you type URL in browser
0:35 HTTP request-response explained
1:10 Client vs Server
1:17 What is Socket?
1:25 IP Address + Port Number
2:14 Client-Server communication architecture
2:32 TCP 3-way handshake
2:40 TCP vs UDP
3:05 Server lifecycle explained
4:05 Start coding Python server
4:18 AF_INET and SOCK_STREAM
4:31 Bind port 80
4:51 Infinite server loop
5:00 Accept connection
5:22 Understanding GET request
6:33 Project folder setup
6:42 Create server.py
7:27 Accept client socket
8:00 Receive client data
8:25 Parse requested filename
9:12 Read HTML file
9:23 Create HTTP response header
9:50 Send response data
10:16 Error handling (404 Not Found)
10:39 Create index.html
11:02 Run server in browser
11:33 Create client.py
11:48 Connect client to server
12:10 Send GET request
12:25 Receive server response
13:06 Final demo + raw HTML response
13:24 Outro

Hashtags

#Python #SocketProgramming #BackendDevelopment #TCPIP #HTTP #WebServer #SystemDesign #ComputerNetworks #PythonProject #SidCodeAI

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