HTTP API requires 'integration' to conform with V2 payload syntax

[lmmattr]

Bug Report

https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html

The docs for the v2 payload say i can return an object from a function but that doesn't work by default. I have to specify integration: lambda in the serverless config file for it to work.

Sample Code

Does not work

• file: serverless.yml

service: my-service

plugins:
  - serverless-offline

provider:
  runtime: nodejs12.x
  stage: dev

functions:
  hello:
    events:
      - httpApi:
          method: GET
          path: /hello
    handler: handler.hello

• file: handler.js

module.exports.hello = async (event, context) => {
  return { message: 'SUCCESS' }
}

Output:
nothing

Works 1

• file: serverless.yml

service: my-service

plugins:
  - serverless-offline

provider:
  runtime: nodejs12.x
  stage: dev

functions:
  hello:
    events:
      - httpApi:
          method: GET
          path: /hello
    handler: handler.hello

• file: handler.js

module.exports.hello = async (event, context) => {
  return 'SUCCESS'
}

Output:

"SUCCESS"

Works 2

• file: serverless.yml

service: my-service

plugins:
  - serverless-offline

provider:
  runtime: nodejs12.x
  stage: dev

functions:
  hello:
    events:
      - httpApi:
          method: GET
          path: /hello
          integration: lambda
    handler: handler.hello

• file: handler.js

module.exports.hello = async (event, context) => {
  return { message: 'SUCCESS' }
}

Output:

{
  "message": "SUCCESS"
}

You also get a warning in the log output of serverless:

Serverless:   at 'functions.hello.events[0].httpApi': unrecognized property 'integration'

Expected behavior/code
You should be able to return an object without having to specify the integration key.

[revmischa]

I noticed if I return an object from a httpApi with v2 event format, serverless-offline returns an empty response but if I deploy the same code to lambda the object appears in the response. Maybe related.

[bryantbiggs]

@lmmattr / @revmischa you might try v6.8.0 which just added AP gateway v2 paylod support with #1092

[Myroslav341]

@bryantbiggs hey just tried installing v.6.8.0. The issue still persists

[revmischa]

endpoint doesn't seem to have these fields. Using latest serverless with httpApi and payload 2.0

[revmischa]

adding integration: lambda as mentioned above does cause this to work

[ljwagerfield]

@lmmattr your Does not work and Works 1 are identical.

[lmmattr]

@ljwagerfield its the handler output that's different between those two.

[vlechemin]

@lmmattr you should try with payload: '2.0'

https://www.serverless.com/framework/docs/providers/aws/events/http-api#event--payload-format