title: AWS API Gateway: Pass through all parameters
body: <p>I am using API Gateway in Amazon as a simple proxy to a backend api. The main reasons for using it are: a simple way to get API keys and authentication, tracking, and handling "environments".</p>
  
  <p>My problem is that, we just want to pass through all query parameters, headers, etc. to our backend and let it handle it. Then on the way back, we'd like to pass back to the client the appropriate response code from our service; not have to explicitly map them. As I understand it, you pretty much have to specify every query parameter, and if the parameters change or you add more, you need to update your api. This is sort of tedious for us during dev/test.</p>
  
  <p>Is there a way to tell Gateway to just accept and pass through any query parameters, headers, etc. so that you dont have to specify them explicitly? Same question for response Status codes?</p>