lambda@edge (on the fly)

How CloudFront delivers content

Global Edge Network

https://aws.amazon.com/cloudfront/features/?whats-new-cloudfront.sort-by=item.additionalFields.postDateTime&whats-new-cloudfront.sort-order=desc

cloud functions vs lambda@edge

	CloudFront Functions	Lambda@Edge
Runtime support	JavaScript (ECMAScript 5.1 compliant)	Node.js, Python
Execution location	218+ CloudFront Edge Locations	13 CloudFront Regional Edge Caches
CloudFront triggers supported	Viewer request Viewer response	Viewer request Viewer response Origin request Origin response
Maximum execution time	Less than 1 millisecond	5 seconds (viewer triggers) 30 seconds (origin triggers)
Maximum memory	2MB	128MB (viewer triggers) 10GB (origin triggers)
Total package size	10 KB	1 MB (viewer triggers) 50 MB (origin triggers)
Network access	No	Yes
File system access	No	Yes
Access to the request body	No	Yes
Pricing	Free tier available; charged per request	No free tier; charged per request and function duration

Links

• connect cloud front to S3

  • https://aws.amazon.com/premiumsupport/knowledge-center/cloudfront-https-requests-s3/

we don't need 'Viwer Request'

query-string also can cache

• https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/QueryStringParameters.html