S3 Lambda Filters
2021 https://aws.amazon.com/blogs/aws/introducing-amazon-s3-object-lambda-use-your-code-to-process-data-as-it-is-being-retrieved-from-s3/
2020 https://medium.com/@techinscribed/authenticated-serverless-websockets-using-api-gateway-golang-lambda-6e661216638
2018 https://aws.amazon.com/blogs/architecture/create-dynamic-contact-forms-for-s3-static-websites-using-aws-lambda-amazon-api-gateway-and-amazon-ses/
https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-post-example.html
AWS Event Driven Architecture#DI2:InvestigateDynamicwebsiteviaS3andLambda