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🤖 Ai回答:
AWS CDN (Content Delivery Network) is primarily provided through Amazon CloudFront, which is AWS's fast content delivery network service、CloudFront securely delivers data, videos, applications, and APIs to customers globally with low latency and high transfer speeds.

Here’s an overview of AWS CDN using Amazon CloudFront:

🔹 What is Amazon CloudFront?

Amazon CloudFront is a global CDN that distributes your content to edge locations around the world、When users request your content, CloudFront serves it from the nearest edge location, reducing latency and improving performance.

🔹 Key Features

Global Edge Network: Over 300 points of presence (PoPs) in more than 30 countries.
Low Latency & High Speed: Delivers content faster by caching it at edge locations.
Security: Integrates with AWS Shield (DDoS protection), AWS WAF (web application firewall), and SSL/TLS encryption.
Customization: Supports custom headers, query strings, cookies, and origin request policies.
Dynamic Content Acceleration: Can serve dynamic content efficiently via Lambda@Edge.
Integration: Works seamlessly with S3, EC2, Elastic Load Balancing, API Gateway, and more.
Caching Control: Fine-grained control over cache behavior and TTLs (Time-To-Live).
Analytics & Monitoring: Real-time metrics via CloudWatch and detailed access logs.

🔹 How It Works

1、A user requests content (e.g., a website image or video).
2、The request goes to the nearest CloudFront edge location.
3、If the content is cached, it’s served immediately.
4、If not cached, CloudFront fetches it from your origin (e.g., S3 bucket or EC2 instance) and caches it for future requests.

🔹 Use Cases

Website Acceleration: Serve static assets like CSS, JS, images.
Video Streaming: Deliver on-demand or live streams using RTMP or HLS.
API Acceleration: Reduce latency for API endpoints.
Global Application Delivery: Improve performance for users across regions.
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Secure Content Distribution: Distribute content with HTTPS and authentication.

🔹 Setup Example: Hosting Static Website via CloudFront + S3

1、Upload files to an S3 bucket.
2、Enable static website hosting in S3.
3、Create a CloudFront distribution:
Set S3 bucket as origin.
Configure default root object (e.g., `index.html`).
Enable HTTPS (use AWS Certificate Manager certificate).
4、Set up DNS (via Route 53) to point your domain to CloudFront.
5、Optional: Add security with AWS WAF or Lambda@Edge.

🔹 Pricing

CloudFront charges based on:
Data transfer out (per GB)
Requests (per million)
Bandwidth usage (by region)

Pricing varies by region and data transfer tier、You can get free usage up to a certain limit (e.g., 1 million requests/month, 1 GB data transfer).

👉 Check [AWS CloudFront Pricing](https://aws.amazon.com/cloudfront/pricing/) for details.

🔹 Best Practices

Use compressed formats (e.g., gzip) to reduce size.
Set appropriate cache expiration (TTL) values.
Use signed URLs or cookies for private content.
Enable HTTP/2 and TLS 1.3 for better performance and security.
Monitor with CloudWatch and Access Logs.

🔹 Related AWS Services

| Service | Purpose |

| S3 | Store static content (origin) |
| Route 53 | DNS management |
| ACM | SSL certificates |
| WAF | Web application firewall |
| Lambda@Edge | Run code at edge locations |
| Shield | DDoS protection |

If you're looking to implement AWS CDN, let me know your use case (e.g., static site, video streaming, API), and I can guide you step-by-step!

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