I believe this is a common pattern but i am trying to enable my API Gateway to serve my Angular Webapp by pulling it from S3. I have my api gateway set up with a GET set up at the / route that is pulling my index.html from the appropraite location in my s3 bucket and another Get set up at /${folder} where file is a specific file. When i hit the root of my api gateway my index.html is pulled and then that triggers requests to pull the needed js/css files via the /{folder} endpoint to get the app to actually run. woohoo!