Is there a way to change the http status codes returned by Amazon API Gateway?

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Update per 20-9-2016

Amazon finally made this easy using the Lambda Proxy integration. This allows your Lambda function to return proper HTTP codes and headers:

let response = {
    statusCode: '400',
    body: JSON.stringify({ error: 'you messed up!' }),
    headers: {
        'Content-Type': 'application/json',
    }
};

context.succeed(response);

Say goodbye request/response mapping in the API Gateway!

Option 2

Integrate an existing Express app with Lambda/API Gateway using aws-serverless-express.

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