Ah, thanks for the extra info. We have several web apps that take user uploads and store it to S3 buckets here too, but still we don't see an adversely high re

Ah, thanks for the extra info. We have several web apps that take user uploads and store it to S3 buckets here too, but still we don't see an adversely high request load. Not sure if the handshaking involved in getting a pre-signed URL will be upping your count? We just use the AWS SDK on our Ruby back end. The user file is first uploaded to the (EC2) app server, then we use the SDK call to transfer it to the S3 bucket. Our storage and request costs are about equal at this stage. Using Lambda/Node, I guess that the SDK is not an option and you have to use the pre-signed URL method? Or else use Python and the SDK library?