How to configure asynchronous lambda invocation via API Gateway using SAM?












1















I have configured a lambda proxy integration with API Gateway using SAM specification and am invoking the lambda asynchronously by passing X-Amz-Invocation-Type: "'Event'" header



  ApiGateway:
Type: AWS::Serverless::Api
Properties:
StageName: prod
DefinitionBody:
swagger: "2.0"
info:
title:
Ref: AWS::StackName
description: API endpoint for invoking LambdaFunction
version: 1.0.0
paths:
/items:
post:
consumes: ["application/json"]
produces: ["application/json"]
responses: {}
x-amazon-apigateway-integration:
type: "aws_proxy"
uri:
Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${LambdaFunction.Arn}/invocations
passthroughBehavior: "when_no_match"
httpMethod: "POST"
requestParameters:
integration.request.header.X-Amz-Invocation-Type: "'Event'"


The problem is that lambda is returning empty response(invoked async) so API Gateway is throwing following error



Wed Nov 14 08:03:14 UTC 2018 : Execution failed due to configuration error: Malformed Lambda proxy response
Wed Nov 14 08:03:14 UTC 2018 : Method completed with status: 502



Is this behaviour expected? Do I have to define responses explicitly? I do not want to throw 200 always because I also want to send bad request and unauthorized errors as well.What's the solution to avoid this problem?










share|improve this question



























    1















    I have configured a lambda proxy integration with API Gateway using SAM specification and am invoking the lambda asynchronously by passing X-Amz-Invocation-Type: "'Event'" header



      ApiGateway:
    Type: AWS::Serverless::Api
    Properties:
    StageName: prod
    DefinitionBody:
    swagger: "2.0"
    info:
    title:
    Ref: AWS::StackName
    description: API endpoint for invoking LambdaFunction
    version: 1.0.0
    paths:
    /items:
    post:
    consumes: ["application/json"]
    produces: ["application/json"]
    responses: {}
    x-amazon-apigateway-integration:
    type: "aws_proxy"
    uri:
    Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${LambdaFunction.Arn}/invocations
    passthroughBehavior: "when_no_match"
    httpMethod: "POST"
    requestParameters:
    integration.request.header.X-Amz-Invocation-Type: "'Event'"


    The problem is that lambda is returning empty response(invoked async) so API Gateway is throwing following error



    Wed Nov 14 08:03:14 UTC 2018 : Execution failed due to configuration error: Malformed Lambda proxy response
    Wed Nov 14 08:03:14 UTC 2018 : Method completed with status: 502



    Is this behaviour expected? Do I have to define responses explicitly? I do not want to throw 200 always because I also want to send bad request and unauthorized errors as well.What's the solution to avoid this problem?










    share|improve this question

























      1












      1








      1








      I have configured a lambda proxy integration with API Gateway using SAM specification and am invoking the lambda asynchronously by passing X-Amz-Invocation-Type: "'Event'" header



        ApiGateway:
      Type: AWS::Serverless::Api
      Properties:
      StageName: prod
      DefinitionBody:
      swagger: "2.0"
      info:
      title:
      Ref: AWS::StackName
      description: API endpoint for invoking LambdaFunction
      version: 1.0.0
      paths:
      /items:
      post:
      consumes: ["application/json"]
      produces: ["application/json"]
      responses: {}
      x-amazon-apigateway-integration:
      type: "aws_proxy"
      uri:
      Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${LambdaFunction.Arn}/invocations
      passthroughBehavior: "when_no_match"
      httpMethod: "POST"
      requestParameters:
      integration.request.header.X-Amz-Invocation-Type: "'Event'"


      The problem is that lambda is returning empty response(invoked async) so API Gateway is throwing following error



      Wed Nov 14 08:03:14 UTC 2018 : Execution failed due to configuration error: Malformed Lambda proxy response
      Wed Nov 14 08:03:14 UTC 2018 : Method completed with status: 502



      Is this behaviour expected? Do I have to define responses explicitly? I do not want to throw 200 always because I also want to send bad request and unauthorized errors as well.What's the solution to avoid this problem?










      share|improve this question














      I have configured a lambda proxy integration with API Gateway using SAM specification and am invoking the lambda asynchronously by passing X-Amz-Invocation-Type: "'Event'" header



        ApiGateway:
      Type: AWS::Serverless::Api
      Properties:
      StageName: prod
      DefinitionBody:
      swagger: "2.0"
      info:
      title:
      Ref: AWS::StackName
      description: API endpoint for invoking LambdaFunction
      version: 1.0.0
      paths:
      /items:
      post:
      consumes: ["application/json"]
      produces: ["application/json"]
      responses: {}
      x-amazon-apigateway-integration:
      type: "aws_proxy"
      uri:
      Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${LambdaFunction.Arn}/invocations
      passthroughBehavior: "when_no_match"
      httpMethod: "POST"
      requestParameters:
      integration.request.header.X-Amz-Invocation-Type: "'Event'"


      The problem is that lambda is returning empty response(invoked async) so API Gateway is throwing following error



      Wed Nov 14 08:03:14 UTC 2018 : Execution failed due to configuration error: Malformed Lambda proxy response
      Wed Nov 14 08:03:14 UTC 2018 : Method completed with status: 502



      Is this behaviour expected? Do I have to define responses explicitly? I do not want to throw 200 always because I also want to send bad request and unauthorized errors as well.What's the solution to avoid this problem?







      amazon-web-services aws-lambda aws-api-gateway aws-sam






      share|improve this question













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      asked Nov 14 '18 at 8:07









      himanshu219himanshu219

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