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This issue you're experiencing with your CSS file updates not reflecting on your static website hosted on S3 is likely related to caching. Here are a few potential reasons and solutions:
1. CloudFront Caching: If you're using CloudFront as a CDN in front of your S3 bucket, it might be serving a cached version of your CSS file. To resolve this, you need to create an invalidation for the specific CSS file or the entire path (e.g., /styles/*) in your CloudFront distribution.
2. Browser Caching: Your browser might be caching the old version of the CSS file. Try clearing your browser cache or accessing the site in an incognito/private browsing window to see if the changes appear.
3. S3 Object Metadata: Ensure that the Content-Type metadata for your CSS file is set correctly to "text/css". Sometimes, S3 might not automatically set the correct content type, which can cause issues with how the file is interpreted.
4. Versioning: Consider implementing versioning for your CSS files. You can append a version number or timestamp to the file name (e.g., styles.css?v=1.1) in your HTML to force the browser to fetch the new version.
5. Cache-Control Headers: Set appropriate Cache-Control headers for your CSS file in S3. You can set it to "no-cache" or a short max-age to ensure that the latest version is fetched more frequently.
6. S3 Consistency: Although rare, there can be a slight delay in S3's eventual consistency model. If you've just uploaded the file, wait a few minutes and try again.
If you've checked all these points and are still experiencing issues, you may want to verify the bucket policy and permissions to ensure there are no restrictions preventing the new file from being served correctly.
Remember to always test your changes in multiple browsers and devices to ensure consistent behavior across different platforms.
Sources
Cloudfront serving a different version of content from an S3 bucket | AWS re:Post
Rendering problem of the static website hosting | AWS re:Post
