AWS Lambda guide part IV – API Gateway and Lambda without S3
It is time for some new final tuning of my small certificate signing service. In previous parts, I showed you what AWS Lambda service is and how to import simple Python application into serverless microservice. I also connected Lambda function to S3 storage service where I put certificates and key files. Then I added a trigger to the function, so Lambda function will execute automatically every time someone uploads new CSR file with certificate request to S3 bucket. Now I will show you not only how to make this function serverless but also storageless using API Gateway. It is not standard approach but in some scenarios might be interesting. So we will connect API Gateway and Lambda without S3 backend for keys and certificates.