Feature request: Response should support multiValueHeaders

[wayne-folkes]

Use case

I have a lambda function with an ALB event source, I was attempting to use Response (from aws_lambda_powertools.event_handler import content_types, Response) instead of constructing the response by hand

return Response(
    status_code=200,
    body=data,
    content_type=content_types.APPLICATION_JSON)

instead of

return {
   "statusCode": 200,
   "statusDescription": "200 OK",
   "multiValueHeaders": {
       "Content-Type":    ["application/json"]
        },
    "body": data
}

the ALB responds with a 502 when using Response I suspect it is because multiValueHeaders is not included in the response.
To get around this, I am doing the following but it is not elegant

response = Response(
  status_code=status_code,
  body=data,
  content_type=content_types.APPLICATION_JSON
        ).__dict__

response["multiValueHeaders"] = {
        "Content-Type": ["application/json"]
}

return response

Solution/User Experience

I would like for the Response object to be able to detect multiValueHeaders in the request and use that to determine if the response should do the same

Alternative solutions

An alternative could be to have MultiValueResponse object that works the same as Response but sends `multiValueHeaders`

Acknowledgment

• This feature request meets Lambda Powertools Tenets
• Should this be considered in other Lambda Powertools languages? i.e. Java, TypeScript

[boring-cyborg]

Thanks for opening your first issue here! We'll come back to you as soon as we can.

[heitorlessa]

@rubenfonseca when you can, could you share the update here as this was implemented for v2?

[heitorlessa]

re-assigning @rubenfonseca for visibility as this is already done in V2 and ready to go by Friday or next week (in case we spot anything wrong in V2 final tests)

[heitorlessa]

Closing as we're wrap to launch V2

[github-actions]

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