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The issue you're experiencing with static assets not loading correctly from your CloudFront CDN in your deployed Next.js application on AWS ECS is likely related to the configuration of your CloudFront distribution and its interaction with your S3 bucket origin.
Here are some potential causes and solutions to consider:
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CloudFront Distribution Configuration: Ensure that your CloudFront distribution is correctly configured to serve content from your S3 bucket. The origin path in your CloudFront distribution should point to the correct folder within your S3 bucket where the static assets are stored.
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Origin Access Identity (OAI): Verify that you're using an Origin Access Identity (OAI) to allow CloudFront to access your S3 bucket. This ensures that your S3 bucket remains private while allowing CloudFront to serve its contents.
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Cache Behavior Settings: Check your CloudFront distribution's cache behavior settings. Make sure you have a catch-all behavior (*) that points to your S3 bucket origin. This ensures that all requests for static assets are routed through CloudFront.
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S3 Bucket Policy: Review your S3 bucket policy to ensure it grants the necessary permissions for CloudFront to access and serve the content.
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Asset Prefix Configuration: Double-check that the assetPrefix in your next.config.js is correctly set to your CloudFront distribution's domain name.
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Build and Deployment Process: Ensure that your build process is correctly uploading all static assets to the S3 bucket, including JavaScript chunks, CSS, and images.
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CloudFront Invalidation: After deploying new assets or making changes, perform a CloudFront invalidation to ensure that the latest versions of your assets are being served.
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CORS Configuration: If you're experiencing CORS-related issues, make sure your S3 bucket and CloudFront distribution have the appropriate CORS settings.
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Custom Domain and SSL: If you're using a custom domain, ensure that it's correctly set up in both your CloudFront distribution and your application configuration.
To troubleshoot further:
- Use browser developer tools to inspect network requests and identify which assets are not being loaded from the CDN.
- Check CloudFront and S3 logs for any error messages or access issues.
- Verify that the paths in your application code match the expected structure in your S3 bucket and CloudFront distribution.
By carefully reviewing and adjusting these configurations, you should be able to resolve the issue and ensure that all static assets, including JavaScript chunks, are correctly served from your CloudFront CDN in your deployed environment.
Sources
Troubleshooting distribution issues - Amazon CloudFront
Intermittent issues accessing S3 assets through CloudFront | AWS re:Post
Ways to use CloudFront - Amazon CloudFront
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