Custom authorizers return 403 "No principalId set on the Response"

[jega-ms]

Bug Report

Custom authorizers return 403 error even after enabling simple response ( "enableSimpleResponses: true")

Current Behavior

{"statusCode":403,"error":"Forbidden","message":"No principalId set on the Response"}

Sample Code

• file: serverless.yml

service: my-service

plugins:
  - serverless-webpack
  - serverless-offline
  - serverless-dynamodb-local
  - serverless-api-compression
  - 
provider:
  runtime: nodejs14.x
  stage: dev
    authorizers:
      firebaseAuth:
        type: request
        identitySource: $request.header.Authorization
        resultTtlInSeconds: 300
        enableSimpleResponses: true
        payloadVersion: "2.0"
        functionName: firebaseAuth
        
functions:
  hello:
    events:
      - http:
          method: get
          path: hello
    handler: handler.hello

• file: handler.js

'use strict'

const { stringify } = JSON
export const authorize = async function (event: any): Promise<APIGatewaySimpleAuthorizerResult> {
   return { isAuthorized: true };
}

Expected behavior/code

Request should not fail with 403 error

Environment

• serverless version: [e.g. v3.2.0]
• serverless-offline version: [e.g. v8.5.0]
• node.js version: [e.g. v17.5.0]
• OS: [ darwin, node 17.5.0, framework 3.2.1 (local) 3.2.0v (global), plugin 6.1.0, SDK 4.3.1]

[vidueirof]

It's related to #1475