effect-aws Lambda Function URL streaming example

This is a small SST app demonstrating LambdaHandler.streamFromHttpApi from @effect-aws/lambda with Lambda Function URL response streaming.

Important

Lambda response streaming works with Lambda Function URLs configured with InvokeMode: RESPONSE_STREAM. API Gateway HTTP API integrations do not support Lambda response streaming.

This example requires the unreleased @effect-aws/lambda change that includes LambdaHandler.streamFromHttpApi. The dependency is installed from a local checkout at ../effect-aws/packages/lambda.

Build the local package before installing or deploying this example:

cd ../effect-aws
pnpm install
pnpm --filter @effect-aws/lambda build

Routes

• GET /ping returns a normal JSON schema response with handle
• GET /stream returns a progressive text stream with handleRaw and HttpServerResponse.stream

Deploy

pnpm install
pnpm run deploy

The deploy output includes StreamingUrl.

Test

Normal JSON response:

curl <StreamingUrl>/ping

Progressive streaming response:

curl -N <StreamingUrl>/stream

Or run the smoke script:

pnpm run smoke <StreamingUrl>

Expected output shows chunk 1, chunk 2, chunk 3, and done arriving about one second apart.

Cleanup

pnpm run remove