Bug: JSON serialization should be the last operation before returning a response from an event handler #3391
Description
Expected Behaviour
Middleware writers should access the original return of the handler, before serialization happens.
Current Behaviour
When writing your own middleware, you only get access to a serialized version of the handler response, and not the original. This introduces challenges when you want to manipulate the original response.
Code snippet
class MyMiddleware(BaseMiddlewareHandler):
def handler(self, app: EventHandlerInstance, next_middleware: NextMiddleware) -> Response:
# Call the handler by calling the next middleware
response = next_middleware(app)
response.body # this should be the original response, not a serialized versionPossible Solution
Move the serialization as the last operation to be done before returning, after running all the middlewares.
Steps to Reproduce
See code snippet above
Powertools for AWS Lambda (Python) version
latest
AWS Lambda function runtime
3.7
Packaging format used
PyPi
Debugging logs
No response