HTTP GET Request from Power Automate to AWS Lambda HTTP Endpoint Fails-CodePudding

I have a simple AWS Lambda function created using Python. I have created an HTTP Endpoint URL to call the function which requires no authentication. I get a proper response if I call the HTTP Endpoint URL using Request library in Python. But I am trying to create a Microsoft Power Automate flow that can invoke the Lambda function using its HTTP Endpoint URL.

The lambda_handler simply returns the following:

return {
        'statusCode': 200,
        'body': 'Hello World from AWS'
        }

When I run an HTTP Flow with a GET request to lambda function url, I get an error message as below:

Http request failed: the content was not a valid JSON. Error while parsing JSON: 'Unexpected character encountered while parsing value: H. Path '', line 0, position 0.'

I have attached an image of the flow configuration.

CodePudding user response：

You have to return a valid JSON from your Lambda.

'Hello World from AWS' is just a string, and the error tells you that H is an unexpected JSON symbol.

You have to wrap your response into json.dumps function:

Change your code to:

import json

return {
  'statusCode': 200,
  'body': json.dumps('Hello World from AWS')
}