API URL Returns Null

Question

...created an IAM role called XYZ with the following policy

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "lambda:InvokeFunction",
            "Resource": "*"
        }
    ]
}

...updated the trust relationship XYZ role to include both lambda and API gateway

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "",
      "Effect": "Allow",
      "Principal": {
        "Service": [
          "lambda.amazonaws.com",
          "apigateway.amazonaws.com"
        ]
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

...created a Lambda function and attached role XYZ. I can execute the Lambda function successfully.

from __future__ import print_function

import json
import datetime

def lambda_handler(event, context):
    ts = datetime.datetime.now().timestamp()
    print (ts)
    print ("Hello")
    #raise Exception('Something went wrong')

...attached an API gateway to the Lambda function. I specified XYZ as the execution role of the method.

I get "null" when invoking the API

Any suggestions as to why?

cody · Accepted Answer · 2018-12-16 01:03:42Z

1

Your lambda_handler isn't returning anything. Try:

def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'body': 'Hello'
    }

answered Dec 16, 2018 at 1:03

cody

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1 Comment

user3423536 Over a year ago

Bingo! Yep, that fixed it. Thank you!

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