Add streaming support for binary files to sendFile() about lambda-api HOT 5 CLOSED

The whole point of sending files through lambda is to get some additional functionality. In my case I need to collect all files in a folder and zip them before sending. Is there a way to do it via a lambda without having to load all files in the lambda memory :(

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Grr... looking a little further, it would seem that the JS version of Lambda may not have a way to return a stream back to API gateway, however. :( (The Java version does)

https://stackoverflow.com/questions/39381139/how-to-stream-aws-lambda-response-in-node

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Just FYI, I posted to the AWS forums asking if there were any plans to add stream input/output support to Lambda on Node... not sure if it will bear any fruit.

https://forums.aws.amazon.com/thread.jspa?threadID=286462

This is a pretty big bummer for me... :(

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Yes, Lambda doesn't support file streaming to API Gateway. Lambda API isn't really designed for loading really large files anyway. However, if you did need to let users download large files from S3, you could use Lambda API to generate access tokens and then use res.redirect() to send them to the S3 bucket URL.

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I did a little more research, and you can use getSignedUrl(), documented here: https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#getSignedUrl-property

This would create a temporary link that you could then redirect the user to. I think I'm going to add this as a feature.

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