Does this blog post help at all?
In this post, I show how you can use the new binary support in API Gateway to turn this Lambda function into a public API, which you can use to include a binary image file in a POST request and get a thumbnail version of that same image. I also show how you can now use API Gateway and Lambda to create a thumbnail service, which you can use to include a binary image file in a POST request and get a thumbnail version of the same image.
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