Cannot send POST data to Lambda

Question

I am trying to send data to my lambda function however the function is not getting my data, the event variable is empty. I am not getting any errors and when I test the function in my API Gateway it works fine. So I am not sure what is happening. My code for sending data to Lambda is below.

var options = { 
    method: 'POST', 
    url: 'correct api url', 
    contentType: "application/json",
    dataType: "json",
    data: s
}

for data: s within my console looks like this data: '{"article_url":"a url here"}'

Any idea what the problem is?

Are you using pass-through or a specific API Gateway mapping template? If you have a mapping template, please include it in your question. — Mark B
– Mark B, Commented Aug 31, 2017 at 12:45
Are you sending the entire event object to the log and verifying that it is totally empty? — Mark B
– Mark B, Commented Aug 31, 2017 at 16:57

SteamDev · Accepted Answer · 2017-08-31 22:15:14Z

0

In the "Integration Request" configuration, make sure you've checked the "Use Lambda Proxy integration" checkbox.

And make sure your output matches the schema defined here to avoid errors:

http://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-set-up-simple-proxy.html#api-gateway-simple-proxy-for-lambda-output-format

{
    "isBase64Encoded": true|false,
    "statusCode": httpStatusCode,
    "headers": { "headerName": "headerValue", ... },
    "body": "..."
}

edited Aug 31, 2017 at 22:15

answered Aug 31, 2017 at 21:46

SteamDev

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9 Comments

Kern Elliott Over a year ago

When I do that I get the error Execution failed due to configuration error: Malformed Lambda proxy response

Kern Elliott Over a year ago

Here is my callback from the lambda function callback(null, {"statusCode": 200, "body": JSON.stringify(response.sentences)}); is it that the headers are missing as to why it is saying the JSON is malformed?

SteamDev Over a year ago

That is likely the issue. You're going to need the header indicating that your payload is application/json

Kern Elliott Over a year ago

ok changed this to a test and it is still getting the error Execution failed due to configuration error: Malformed Lambda proxy response my test response is callback(null, {"statusCode": 200, headers: {"Content-Type": "application/json"}, "body": {'testing':'test'}});

SteamDev Over a year ago

Body is not a valid JSON string. Try stringifying that {testing} object.

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