Use http.Agent to speed up S3 calls

[inian]

A http agent can be used to keep a set of connections open to S3. By default, a new connection is created each time S3 is accessed which is not ideal.

https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/node-reusing-connections.html

[logikaljay]

@inian It appears as if keepAlive: true is the default in the NodeHttpHandler that the s3-client uses:

https://github.com/aws/aws-sdk-js-v3/blob/49e2d61c809d20ae444d49c7f6c4e997da7cca74/packages/node-http-handler/src/node-http-handler.ts#L44-L48

[inian]

You are right @logikaljay :) This was required for their v2 sdk but looks like they have better defaults now.