Function URL returns null but Lambda function is working

Hi Uri, thanks for the reply. Do you mean something like this?

import json import boto3 import requests

client = boto3.client('rekognition', region_name='ap-southeast-2')

def lambda_handler(event, context): # TODO implement bucket_name = "intelli1a" file_name = "msic.jpg"

response = client.detect_faces(Image={'S3Object':{'Bucket':bucket_name,'Name':file_name}},
                               Attributes=['ALL'])

#Process response
for faceDetail in response['FaceDetails']:
    print(json.dumps(faceDetail, indent=2))

#Insert JSON response format
expected_response = {
    "statusCode": 201,
    "headers": {
        "Content-Type": "application/json",
        "My-Custom-Header": "Custom Value"
    },
    "body": "{ \"message\": \"Hello, world!\" }",
    "cookies": [
        "Cookie_1=Value1; Expires=21 Oct 2021 07:48 GMT",
        "Cookie_2=Value2; Max-Age=78000"
    ],
    "isBase64Encoded": False
}

got it Uri, just a small change and it worls. Thanks so much for your input, really appreciate it

#Process response
for faceDetail in response['FaceDetails']:
    return {  'statusCode' : 200,
    'body': json.dumps(faceDetail, indent=2)

Happy to hear that it works, however, looking at your code, I see that you return inside a loop. This means that your function will operate correctly only if there is a single face in the image.

You should construct an array of all faces in the loop and then, after the loop, return the array as part of the body.