amazon web services - Configure CORS response headers on AWS Lambda?

Question

I'm trying to create a new service using AWS API Gateway, but I found out the browser automatically calls OPTIONS method in order to obtain CORS information.

The problem is that AWS API Gateway does not offer a native way to configure CORS headers.

Is it possible to create a Lambda Script in order to respond to OPTIONS method?

Answer 1

If you have lambda-proxy enabled, you need to set the CORS headers manually:

module.exports.hello = function(event, context, callback) {

    const response = {
      statusCode: 200,
      headers: {
        "Access-Control-Allow-Origin" : "*", // Required for CORS support to work
        "Access-Control-Allow-Credentials" : true // Required for cookies, authorization headers with HTTPS
      },
      body: JSON.stringify({ "message": "Hello World!" })
    };

    callback(null, response);
};

https://serverless.com/framework/docs/providers/aws/events/apigateway#enabling-cors