AWS CloudFormationでAWS AppSync上にGraphQL APIを構築したい（HTTPデータソース）

AWSTemplateFormatVersion: '2010-09-09'
Resources:
  GraphQLApi:
    Type: AWS::AppSync::GraphQLApi
    Properties:
      AuthenticationType: API_KEY
      Name: AppSync Playground(cfn)

  ApiKey:
    Type: AWS::AppSync::ApiKey
    Properties:
      ApiId:
        Fn::GetAtt: [GraphQLApi, ApiId]
      Expires: 1677510000 # 2023年2月28日 火曜日 00:00:00 GMT+09:00

  DataSource1:
    Type: AWS::AppSync::DataSource
    Properties:
      ApiId:
        Fn::GetAtt: [GraphQLApi, ApiId]
      Name: catstronauts_rest_api
      Type: HTTP
      HttpConfig:
        Endpoint: https://odyssey-lift-off-rest-api.herokuapp.com

  FunctionConfiguration1:
    Type: AWS::AppSync::FunctionConfiguration
    Properties:
      ApiId:
        Fn::GetAtt: [GraphQLApi, ApiId]
      DataSourceName:
        Fn::GetAtt: [DataSource1, Name]
      FunctionVersion: '2023-02-14'
      Name: getTracksForHome
      Runtime:
        Name: APPSYNC_JS
        RuntimeVersion: 1.0.0
      Code: |
        import { util } from '@aws-appsync/utils';

        export function request(ctx) {
          return {
            method: 'GET',
            params: {
              headers: { 'Content-Type': 'application/json' },
            },
            resourcePath: '/tracks',
          };
        }

        export function response(ctx) {
          const { error, result } = ctx;
          if (error) {
            ctx.stash.errors = ctx.stash.errors ?? [];
            ctx.stash.errors.push(ctx.error);
            return util.appendError(error.message, error.type, result);
          }

          if (result.statusCode === 200) {
            return JSON.parse(result.body);
          } else {
            return util.appendError(result.body, result.statusCode);
          }
        }

  FunctionConfiguration2:
    Type: AWS::AppSync::FunctionConfiguration
    Properties:
      ApiId:
        Fn::GetAtt: [GraphQLApi, ApiId]
      DataSourceName:
        Fn::GetAtt: [DataSource1, Name]
      FunctionVersion: '2023-02-14'
      Name: getAuthor
      Runtime:
        Name: APPSYNC_JS
        RuntimeVersion: 1.0.0
      Code: |
        import { util } from '@aws-appsync/utils';

        export function request(ctx) {
          return {
            method: 'GET',
            params: {
              headers: { 'Content-Type': 'application/json' },
            },
            resourcePath: `/author/${ctx.source.authorId}`,
          };
        }

        export function response(ctx) {
          const { error, result } = ctx;
          if (error) {
            ctx.stash.errors = ctx.stash.errors ?? [];
            ctx.stash.errors.push(ctx.error);
            return util.appendError(error.message, error.type, result);
          }

          if (result.statusCode === 200) {
            return JSON.parse(result.body);
          } else {
            return util.appendError(result.body, result.statusCode);
          }
        }

  GraphQLSchema:
    Type: AWS::AppSync::GraphQLSchema
    Properties:
      ApiId:
        Fn::GetAtt: [GraphQLApi, ApiId]
      Definition: |
        type Author {
          id: ID!
          name: String!
          photo: String
        }

        type Query {
          tracksForHome: [Track!]!
        }

        type Track {
          id: ID!
          title: String!
          author: Author!
          thumbnail: String
          length: Int
          modulesCount: Int
        }

  Resolver1:
    Type: AWS::AppSync::Resolver
    Properties:
      ApiId:
        Fn::GetAtt: [GraphQLApi, ApiId]
      TypeName: 'Query'
      FieldName: 'tracksForHome'
      Kind: PIPELINE
      Runtime:
        Name: APPSYNC_JS
        RuntimeVersion: 1.0.0
      Code: |
        import {util} from '@aws-appsync/utils';

        export function request(ctx) {
            return {};
        }

        export function response(ctx) {
            return ctx.prev.result;
        }
      PipelineConfig:
        Functions: [Fn::GetAtt: [FunctionConfiguration1, FunctionId]]

  Resolver2:
    Type: AWS::AppSync::Resolver
    Properties:
      ApiId:
        Fn::GetAtt: [GraphQLApi, ApiId]
      TypeName: 'Track'
      FieldName: 'author'
      Kind: PIPELINE
      Runtime:
        Name: APPSYNC_JS
        RuntimeVersion: 1.0.0
      Code: |
        import {util} from '@aws-appsync/utils';

        export function request(ctx) {
            return {};
        }

        export function response(ctx) {
            return ctx.prev.result;
        }
      PipelineConfig:
        Functions: [Fn::GetAtt: [FunctionConfiguration2, FunctionId]]