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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Day 1: Introduction to REST APIs - REST API Course</title>
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<li><a href="index.html" class="flex items-center py-2 px-4 rounded-lg hover:bg-gray-700 transition-colors font-semibold"><i class="fas fa-home mr-3"></i>Home</a></li>
<li><a href="day1.html" class="flex items-center py-2 px-4 rounded-lg hover:bg-gray-700 transition-colors"><i class="fas fa-rocket mr-3"></i>Day 1: Introduction</a></li>
<li><a href="day2.html" class="flex items-center py-2 px-4 rounded-lg hover:bg-gray-700 transition-colors"><i class="fas fa-arrow-down mr-3"></i>Day 2: GET/POST Requests</a></li>
<li><a href="day3.html" class="flex items-center py-2 px-4 rounded-lg hover:bg-gray-700 transition-colors"><i class="fas fa-signal mr-3"></i>Day 3: HTTP Status Codes</a></li>
<li><a href="day4.html" class="flex items-center py-2 px-4 rounded-lg hover:bg-gray-700 transition-colors"><i class="fas fa-edit mr-3"></i>Day 4: PUT & DELETE</a></li>
<li><a href="day5.html" class="flex items-center py-2 px-4 rounded-lg hover:bg-gray-700 transition-colors"><i class="fas fa-lock mr-3"></i>Day 5: Authentication</a></li>
<li><a href="day6.html" class="flex items-center py-2 px-4 rounded-lg hover:bg-gray-700 transition-colors"><i class="fas fa-sliders-h mr-3"></i>Day 6: Headers & Query Params</a></li>
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<!-- Main Content -->
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<div class="max-w-4xl mx-auto">
<h1 class="text-4xl font-bold mb-6">Day 1: Introduction to REST APIs</h1>
<div class="bg-white rounded-lg shadow-lg p-6 mb-8">
<h2 class="text-2xl font-semibold mb-4">What is a REST API?</h2>
<p class="mb-4">
REST (Representational State Transfer) is an architectural style for designing networked applications.
It relies on a stateless, client-server communication protocol - typically HTTP.
</p>
<p class="mb-4">
REST APIs are designed to take advantage of existing protocols. While REST can be used over nearly any protocol,
it usually takes advantage of HTTP when used for Web APIs.
</p>
</div>
<div class="bg-white rounded-lg shadow-lg p-6 mb-8">
<h2 class="text-2xl font-semibold mb-4">HTTP Basics</h2>
<p class="mb-4">HTTP (Hypertext Transfer Protocol) is the foundation of data communication for the World Wide Web.</p>
<h3 class="text-xl font-semibold mb-2">HTTP Methods:</h3>
<ul class="list-disc pl-6 space-y-2 mb-4">
<li><strong>GET</strong> - Retrieve data from a server</li>
<li><strong>POST</strong> - Send data to a server to create a resource</li>
<li><strong>PUT</strong> - Update an existing resource</li>
<li><strong>DELETE</strong> - Remove a resource</li>
</ul>
<h3 class="text-xl font-semibold mb-2">HTTP Status Codes:</h3>
<ul class="list-disc pl-6 space-y-2">
<li><strong>2xx</strong> - Success (200 OK, 201 Created)</li>
<li><strong>3xx</strong> - Redirection (301 Moved Permanently)</li>
<li><strong>4xx</strong> - Client Error (404 Not Found, 400 Bad Request)</li>
<li><strong>5xx</strong> - Server Error (500 Internal Server Error)</li>
</ul>
</div>
<div class="bg-white rounded-lg shadow-lg p-6 mb-8">
<h2 class="text-2xl font-semibold mb-4">JSON Format</h2>
<p class="mb-4">
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write
and easy for machines to parse and generate.
</p>
<pre><code>{
"name": "John Doe",
"age": 30,
"email": "john@example.com",
"address": {
"street": "123 Main St",
"city": "New York"
}
}</code></pre>
</div>
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<h2 class="text-2xl font-semibold mb-4">REST vs SOAP</h2>
<div class="overflow-x-auto">
<table class="min-w-full">
<thead>
<tr class="bg-gray-100">
<th class="py-2 px-4">Feature</th>
<th class="py-2 px-4">REST</th>
<th class="py-2 px-4">SOAP</th>
</tr>
</thead>
<tbody>
<tr>
<td class="py-2 px-4">Protocol</td>
<td class="py-2 px-4">HTTP</td>
<td class="py-2 px-4">HTTP, SMTP, TCP</td>
</tr>
<tr>
<td class="py-2 px-4">Data Format</td>
<td class="py-2 px-4">JSON, XML</td>
<td class="py-2 px-4">XML</td>
</tr>
<tr>
<td class="py-2 px-4">Performance</td>
<td class="py-2 px-4">Faster</td>
<td class="py-2 px-4">Slower</td>
</tr>
<tr>
<td class="py-2 px-4">Learning Curve</td>
<td class="py-2 px-4">Easier</td>
<td class="py-2 px-4">Steeper</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="bg-white rounded-lg shadow-lg p-6 mb-8">
<h2 class="text-2xl font-semibold mb-4">Practical Exercise</h2>
<p class="mb-4">
Let's make our first API call using Insomnia:
</p>
<ol class="list-decimal pl-6 space-y-2">
<li>Open Insomnia</li>
<li>Create a new GET request</li>
<li>Enter URL: https://jsonplaceholder.typicode.com/posts/1</li>
<li>Send the request</li>
<li>Observe the response</li>
</ol>
</div>
<div class="bg-white rounded-lg shadow-lg p-6 mb-8">
<h2 class="text-2xl font-semibold mb-4">Practice Questions</h2>
<div class="space-y-6">
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<h3 class="text-xl font-semibold text-blue-800 mb-2">Multiple Choice</h3>
<div class="space-y-4">
<div class="p-3 bg-white rounded shadow">
<p class="font-semibold mb-2">1. What does REST stand for?</p>
<div class="space-y-2">
<label class="flex items-center">
<input type="radio" name="q1" class="mr-2">
A. Representational State Transfer
</label>
<label class="flex items-center">
<input type="radio" name="q1" class="mr-2">
B. Remote State Transfer
</label>
<label class="flex items-center">
<input type="radio" name="q1" class="mr-2">
C. Representational Server Transfer
</label>
</div>
</div>
<div class="p-3 bg-white rounded shadow">
<p class="font-semibold mb-2">2. Which HTTP method is used to create a new resource?</p>
<div class="space-y-2">
<label class="flex items-center">
<input type="radio" name="q2" class="mr-2">
A. GET
</label>
<label class="flex items-center">
<input type="radio" name="q2" class="mr-2">
B. POST
</label>
<label class="flex items-center">
<input type="radio" name="q2" class="mr-2">
C. PUT
</label>
</div>
</div>
</div>
</div>
<div class="bg-green-50 p-4 rounded-lg">
<h3 class="text-xl font-semibold text-green-800 mb-2">True/False</h3>
<div class="space-y-4">
<div class="p-3 bg-white rounded shadow">
<p class="font-semibold mb-2">3. REST APIs must use JSON format for data exchange.</p>
<div class="space-y-2">
<label class="flex items-center">
<input type="radio" name="q3" class="mr-2">
True
</label>
<label class="flex items-center">
<input type="radio" name="q3" class="mr-2">
False
</label>
</div>
</div>
<div class="p-3 bg-white rounded shadow">
<p class="font-semibold mb-2">4. HTTP is a stateless protocol.</p>
<div class="space-y-2">
<label class="flex items-center">
<input type="radio" name="q4" class="mr-2">
True
</label>
<label class="flex items-center">
<input type="radio" name="q4" class="mr-2">
False
</label>
</div>
</div>
</div>
</div>
<div class="bg-purple-50 p-4 rounded-lg">
<h3 class="text-xl font-semibold text-purple-800 mb-2">Practical Exercise</h3>
<div class="space-y-4">
<div class="p-3 bg-white rounded shadow">
<p class="font-semibold mb-2">5. Using Insomnia, make a GET request to https://jsonplaceholder.typicode.com/users and answer:</p>
<div class="space-y-2">
<p class="text-sm text-gray-600">a) How many users are returned?</p>
<input type="number" class="border rounded p-2 w-24">
<p class="text-sm text-gray-600">b) What is the email of the first user?</p>
<input type="text" class="border rounded p-2 w-full">
</div>
</div>
</div>
</div>
</div>
<div class="mt-6">
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Check Answers
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