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<!DOCTYPE html>
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<title>Day 3: HTTP Status Codes - REST API Course</title>
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<h1 class="text-4xl font-bold mb-6">Day 3: HTTP Status Codes</h1>
<div class="bg-white rounded-lg shadow-lg p-6 mb-8">
<h2 class="text-2xl font-semibold mb-4">Understanding HTTP Status Codes</h2>
<p class="mb-4">
HTTP status codes are three-digit numbers that indicate the outcome of an HTTP request. They are grouped into five classes:
</p>
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<div class="bg-green-50 p-4 rounded-lg">
<h3 class="text-xl font-semibold text-green-800 mb-2">2xx - Success</h3>
<ul class="list-disc pl-6 space-y-1">
<li>200 OK - Request succeeded</li>
<li>201 Created - Resource created</li>
<li>204 No Content - Success but no content</li>
</ul>
</div>
<div class="bg-blue-50 p-4 rounded-lg">
<h3 class="text-xl font-semibold text-blue-800 mb-2">3xx - Redirection</h3>
<ul class="list-disc pl-6 space-y-1">
<li>301 Moved Permanently</li>
<li>302 Found (Temporary Redirect)</li>
<li>304 Not Modified</li>
</ul>
</div>
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<h3 class="text-xl font-semibold text-yellow-800 mb-2">4xx - Client Error</h3>
<ul class="list-disc pl-6 space-y-1">
<li>400 Bad Request</li>
<li>401 Unauthorized</li>
<li>403 Forbidden</li>
<li>404 Not Found</li>
</ul>
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<h3 class="text-xl font-semibold text-red-800 mb-2">5xx - Server Error</h3>
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<li>500 Internal Server Error</li>
<li>502 Bad Gateway</li>
<li>503 Service Unavailable</li>
</ul>
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<h2 class="text-2xl font-semibold mb-4">Real-Life Examples</h2>
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<div>
<h3 class="text-xl font-semibold mb-2">Success Scenario (200 OK)</h3>
<pre><code>GET https://api.example.com/users/1
Response: 200 OK
{
"id": 1,
"name": "John Doe",
"email": "john@example.com"
}</code></pre>
</div>
<div>
<h3 class="text-xl font-semibold mb-2">Resource Not Found (404)</h3>
<pre><code>GET https://api.example.com/users/999
Response: 404 Not Found
{
"error": "User not found",
"message": "The requested user does not exist"
}</code></pre>
</div>
<div>
<h3 class="text-xl font-semibold mb-2">Authentication Error (401)</h3>
<pre><code>GET https://api.example.com/protected-resource
Response: 401 Unauthorized
{
"error": "Unauthorized",
"message": "Authentication required"
}</code></pre>
</div>
</div>
</div>
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<h2 class="text-2xl font-semibold mb-4">Best Practices</h2>
<ul class="list-disc pl-6 space-y-2">
<li>Always use appropriate status codes</li>
<li>Include meaningful error messages</li>
<li>Use consistent error response format</li>
<li>Document all possible status codes in API documentation</li>
<li>Handle errors gracefully on the client side</li>
</ul>
</div>
<div class="bg-white rounded-lg shadow-lg p-6">
<h2 class="text-2xl font-semibold mb-4">Practical Exercise</h2>
<p class="mb-4">Using Insomnia, test different endpoints and observe their status codes:</p>
<ol class="list-decimal pl-6 space-y-2">
<li>Test a valid GET request to JSONPlaceholder</li>
<li>Test a non-existent resource</li>
<li>Test an endpoint without authentication</li>
<li>Test with invalid data in POST request</li>
</ol>
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