Mapping Lambda output to API Gateway header

Question

I'm trying to map the JSON output from a Lambda function to the header of an API Gateway call. As an example here, we can consider a redirect scenario. So I'd like to add a Location header to the response from my API Gateway call.

JSON output from Lambda function:

{
    Location: 'http://google.com'
}

In "Method Response"->"Response Headers" I can add the Location header to the desired HTTP status code.

Then in "Integration Response"->"Header Mappings" I can add the mapping for the Location header to be something.

Now my question is what should this something be?

Note: I've tried integration.response.header.Location, or using "Mapping Templates" but no luck so far.

There's a chance that it might not be possible at the moment (https://forums.aws.amazon.com/thread.jspa?messageID=651482), but since API Gateway/Lambda are evolving so quickly at the moment I'll ask anyway.

Answer 1

As of today (January 2016), it works by simply specifying integration.response.body.Location in your case.

Answer 2

Today (12th, November, 2015), I was looking for how to pass the Location header from my backend API to a Location header in integration response.

This configuration worked and I could get Location header from backend api:

Looks like the solution proposed by Tobias is possible currently. However, the Location header points to the backend API and this is not what we want. I'll try to find a solution for this and post it here.