Sample - Lambda large payload response with Streaming Response via CloudFront

This repository is a demo sample that Lambda response large payload ( > 6MB) using Lambda Streaming Response via CloudFront.

This is not for production, use it for testing.

日本語の情報

Architecture

The following is an architecture deployed by CDK.

It is not practical because it only retrieves and responds to files stored in S3. This is done for simplicity.

How to deploy

All resources for this project are provisioned by the AWS Cloud Development Kit (CDK). If you have not installed the CDK, first install it by referring to this document.

1. Clone this project

git clone https://github.com/msysh/aws-sample-lambda-stream-response-via-cloudfront.git

2. Deploy AWS resources by CDK

cd aws-sample-lambda-stream-response-via-cloudfront
cdk deploy

After completion deployment, you can get following values and so on. Please note them.

• CloudFront Distribution URL (OutputCloudFrontDistributionUrl)
• S3 Bucket name (OutputS3BucketName)

3. Upload a large file to S3

Upload a large file (> 6MB) to S3 for Lambda Streaming Response.

aws s3 cp large.pdf s3://${BUCKET_NAME}/

${BUCKET_NAME} is able to get as OutputS3BucketName from CDK Output.

4. Request to Lambda Function URL via CloudFront

Request to Lambda Function URL via CloudFront

curl -v https://${CLOUDFRONT_DOMAIN_NAME}/large.pdf

https://${CLOUDFRONT_DOMAIN_NAME} is able to get as OutputCloudFrontDistributionUrl from CDK Output.

You should get the following output:

*   (snip)
> GET /large.pdf HTTP/2
> Host: dXXXXXXXXXXXXX.cloudfront.net
> User-Agent: curl/8.4.0
> Accept: */*
>
< HTTP/2 200
< content-type: application/pdf
<   (snip)
{ [15922 bytes data]

You can see that the response is returned in streaming mode.

If you request with --http1.1, the HTTP response header will be set to Transfer-Encoding: chunked

>   (snip)
> GET /large.pdf HTTP/1.1
> Host: dXXXXXXXXXXXXX.cloudfront.net
> User-Agent: curl/8.4.0
> Accept: */*
>
< Content-Type: application/pdf
< Transfer-Encoding: chunked
< Connection: keep-alive
<   (snip)
  0     0    0     0    0     0      0      0 --:--:--  0:00:02 --:--:--     0{ [16384 bytes data]
100 6858k    0 6858k    0     0  1352k      0 --:--:--  0:00:05 --:--:-- 1792k

Clean up

Remove resources by CDK.

cdk destroy

License

MIT