aws api gateway lambda proxy integration response error

Question

im trying to use AWS api gateway proxy integration with lambda to make an external api call, and i want to return the response as is back to the api gateway .

when i am executing my lambda with custom event every thing works fine , but when im trying to test it with api gateway i get an error.

event example:

{
  "requestType": "somedata",
  "requestID": "somedata",
  "createMagicLink": {
    "id": "somedata",
    "phone": "somedata",
    "urlID": "somedata",
    "callID": "somedata",
    "caller": "somedata",
    "toSendSMS": somedata
  }
}

lambda example :

import requests
import json


def lambda_handler(event, context):
    
    url = "https://someUrl"
    headers = {"Accept": "application/json","API-TOKEN": "someToken", "content-type":"application/json"}
    data = event

                
    response = requests.post(url, headers=headers, json=data)
    json_response = response.json()
    json_obj = json_response['response']

    return {
        "isBase64Encoded": 'false',
        "statusCode": 200,
        "body": json_obj
        }

lambda response , works fine :

{
  "isBase64Encoded": "false",
  "statusCode": 200,
  "body": {
    "status": "0",
    "GUID": "******",
    "magicURL": "someUrl",
    "errorMessage": ""
  }
}

when im trying to execute through api gateway post request im getting an internal server error 502 (ive changed the data var in my lambda function to data = event['body'] to catch the event from api gateway)

Sat Feb 25 14:40:58 UTC 2023 : Endpoint response body before transformations: {"errorMessage": "'response'", "errorType": "KeyError", "stackTrace": ["  File \"/var/task/index.py\", line 14, in lambda_handler\n    json_obj = json_response['response']\n"]}
Sat Feb 25 14:40:58 UTC 2023 : Lambda execution failed with status 200 due to customer function error: 'response'. Lambda request id: *
Sat Feb 25 14:40:58 UTC 2023 : Method completed with status: 502

what am i missing ?

Tyler2P · Accepted Answer · 2023-03-03 16:17:32Z

0

solved by adding json.loads(event['body']) and json.dumps(json_obj) to the lambda function

import requests
import json


def lambda_handler(event, context):
    
    url = "https://someUrl"
    headers = {"Accept": "application/json","API-TOKEN": "someToken", "content-type":"application/json"}
    data = json.loads(event['body'])

                
    response = requests.post(url, headers=headers, json=data)
    json_response = response.json()
    json_obj = json_response['response']

    return {
        "isBase64Encoded": 'false',
        "statusCode": 200,
        "body": json.dumps(json_obj)
    }

I hope it will help someone

edited Mar 3, 2023 at 16:17

Tyler2P

2,37030 gold badges26 silver badges34 bronze badges

answered Feb 26, 2023 at 7:59

Dani-Bholenath

33 bronze badges

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