title: AWS Error: Proxy integrations cannot be configured to transform responses
body: <p>I'm a beginner in Amazon's Lambda-API implementations.</p>
  
  <p>I'm just deploying a very simple API: a very simple lambda function with Python 2.7 printing "Hello World" that I trigger with API Gateway. However, when I click on the Invoke URL link, it tells me "<strong>{"message": "Internal server error"}</strong>".</p>
  
  <p>Thus, I'm trying to see what is wrong here, so I click on the API itself and I can see the following being grey in my Method Execution: "<strong>Integration Response: Proxy integrations cannot be configured to transform responses.</strong>"</p>
  
  <p><a href="https://i.stack.imgur.com/p6M3a.png" rel="noreferrer"><img src="https://i.stack.imgur.com/p6M3a.png" alt="enter image description here"></a></p>
  
  <p>I have tested many different configurations but I still face the same error. I have no idea why this step is grey.</p>