How to call a Lambda function with an event call type through an API gateway?

Question

The docs say:

By default, the Invoke API uses the RequestResponse call type. You can request asynchronous execution by specifying the event as InvocationType.

So, all I can send to my function (python) is InvocationType: Event everywhere:

curl -X POST "https://X.execute-api.us-east-1.amazonaws.com/prod/Y?InvocationType=Event" 
-d "InvocationType:Event" 
-H "X-Amz-Invocation-Type:Event"

(function sleeps 3 seconds then responses)

null

But not Async ... docs also says:

When you call the Lambda function through the AWS console or through HTTPS using the Amazon API Gateway, Lambda always uses the RequestResponse call type.

I know that this is possible using aws-CLI, that I do not understand if it is possible to do this from the endpoint of the API gateway.

Answer 1

, API Gateway - RequestResponse .

, 2 :

• A " ", "Function Executer"

  from __future__ import print_function
  
  import boto3
  import json
  
  def lambda_handler(event, context):
      client = boto3.client('lambda')
      client.invoke_async(
          FunctionName='my_long_task_running_function_executer',
          InvokeArgs=json.dumps(event)
      )
      return {"result": "OK"}
  

2. " Executer", .

, API InvocationType = Event.

Answer 2

Lambdas Lambda.Client.invoke InvocationType = ApiGateway, Lambda. , , ApiGateway .

Lambda ApiGateway:

from __future__ import print_function

import boto3
import json

def lambda_handler(event, context):
response = client.invoke(
    FunctionName='<your_long_task_running_function_executer>',
    InvocationType='Event',
    Payload=json.dumps(event)
)
return { "result": "OK" }

, , , .

p.s. , invoke_async
p.p.s. , , , : 0. , ; 1. api; 2. ( , ) InvocationType = 'Event' .

Answer 3

: X-Amz-Invocation-Type: Event https://docs.aws.amazon.com/apigateway/latest/developerguide/integrating-api-with-aws-services-lambda.html