Create GET API

  1. Open template.yaml in fcj-book-shop folder
  2. Add the following script at the end of the file creating a REST API and GET method 
      BookApi:
    Type: AWS::Serverless::Api
    Name: fcj-serverless-api
    Properties:
      StageName: staging
      Cors: "'*'"      # enable CORS for API
      DefinitionBody:
        openapi: 3.0.1
        info:
          description: "This is the APIs for book shop web app"
          version: "1.0.0"
          title: "API Gateway REST API to Lambda"
        paths:
          /books:
            get:
              responses:
                "200":
                  description: 200 response
                  headers:
                    Access-Control-Allow-Origin:
                      type: string
              x-amazon-apigateway-integration:
                uri:
                  Fn::Sub: "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${BooksList.Arn}/invocations"
                responses:
                  default:
                    statusCode: 200
                    responseParameters:
                      method.response.header.Access-Control-Allow-Origin: "'*'"
                passthroughBehavior: when_no_match
                httpMethod: POST #always POST
                type: aws_proxy
    CreateGetAPI
  • Add the following script at the end of the BooksList function 
          Events:
        ListBook:
          Type: Api
          Properties:
            Path: /books/
            Method: get
            RestApiId:
              Ref: BookApi
    CreateGetAPI

  1. Run the following command to deploy SAM

    sam build
sam deploy

    CreateGetAPI

    Enter “y” if asked “BooksList may not have authorization defined, Is this okay? [y/N]: "

  2. Open Lambda console, click books_list function

    • Click API Gateway CreateGetAPI

  3. Show API Gateway being interacted with function

    • Click this API Gateway CreateGetAPI

  4. Display resources and GET method CreateGetAPI

  5. Click Stages on the left menu

    • Click staging
    • Click GET
    • Record InvokeURL of GET method CreateGetAPI