"message" : "Internal server error" issue with Lambda/API Gateway and iOS

Question

I've set up a lambda function and created some GET and POST methods inside the API Gateway which seem to work fine when testing them inside the web application. I am then trying to call the functions inside an iOS application which is set up using the mobile hub. The functions also work inside the testing facility via the mobile hub perfectly fine, however when I actually test the functions inside the app I get:

"message" : "Internal server error"

I know the error is not much to work from, but I can't figure out a way to get a more detailed error description.

Any ideas?

Answer 1

This may happen because your Lambda function is not set to return a HTTP status code.

Changing from

exports.handler = (event, context, callback) => {
    callback(null, 'Hello from Lambda');
};

to

exports.handler = (event, context, callback) => {
    callback(null, { statusCode: 200, body: 'Hello from Lambda' });
};

Should fix the issue.