null response when calling lambda - node.js

Question

My lambda function is returning a null response and I'm not sure why. When I change 'res.body' to 'res.statusCode' I get the status code 200 as expected. I've checked the logs of my api call and see that there are no issues with the details I am passing (also confirmed using a curl command. Any ideas?
const https = require('https');
function getRequest() {
const options = {
host: 'vehimgd36c3.execute-api.ap-southeast-2.amazonaws.com',
path: '/callinglink',
method: 'GET',
headers: {
'link': 'https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_lambda.Function.html'
}
}
return new Promise(function(resolve, reject) {
https.get(options, (res) => {
resolve(res.body)
}).on('error', (e) => {
reject(Error(e))
})
})
}
exports.GetReturnMessage = async (event) => {
try {
const result = await getRequest();
console.log(result)
return {
"sessionState": {
"dialogAction": {
"type": "Close"
},
"intent": {
"confirmationState": "Confirmed",
"name": "FinalResponse",
"state": "InProgress",
},
},
"messages": [
{
"contentType": "CustomPayload",
"content": result
},
]
};
} catch (error) {
console.log('Error is: ️', error);
return {
statusCode: 400,
body: error.message,
};
}
};

Answer 1

If you check how to use lambda and apigateway. apigateway expects the lamba function to return a response with the structure Read here
var response = {
"statusCode": 200,
"body": "{\n \"TotalCodeSize\": 104330022,\n \"FunctionCount\": 26\n}"
}
in that case you could try returning your object as follows:
exports.GetReturnMessage = async (event) => {
try {
const result = await getRequest();
console.log(result)
const response = {
"sessionState": {
"dialogAction": {
"type": "Close"
},
"intent": {
"confirmationState": "Confirmed",
"name": "FinalResponse",
"state": "InProgress",
},
},
"messages": [
{
"contentType": "CustomPayload",
"content": result
},
]
};
return {
"statusCode": 200,
"body": JSON.stringify(response)
}
} catch (error) {
console.log('Error is: ️', error);
return {
statusCode: 400,
body: error.message,
};
}
}