serverless.yml

service: serverless-offline-mapping-templates
frameworkVersion: '2'

plugins:
  - serverless-offline

provider:
  name: aws
  runtime: nodejs12.x
  stage: dev
  lambdaHashingVersion: 20201221

functions:
  mainFunc:
    handler: api/index.handler
    memorySize: 128
    events:
      - http: 
          path: gettime
          method: get
          integration: lambda
          request:
            passThrough: NEVER
            template:
              application/json: '{ "triggerError" : "$input.params(''trigger_error'')"  }'
          response:
            statusCodes:
              200:
                pattern: ''
                headers:
                  Content-Type: "'application/json'"
                template: '{ "output" : "Current time is $input.path(''$'').currentTime" }'
              400:
                pattern: '.*error.*'
                headers:
                  Content-Type: "'application/json'"
                template: '{ "output" : "Failed to get current time." }'