How to access HTTP headers for request to AWS API Gateway using Lambda?

Question

I see in the API Gateway FAQ that it is possible to access the request headers sent to the API Gateway...

If you already utilize OAuth tokens or any o

Answer 1

The solution by kennbrodhagen worked great for me, see his answer and blog for the details. Since the poster expressed a preference for Java implementation, and it took me a while to figure out how to implement Kenn's handler in java, I'm just sharing the Java code that corresponds:

public class MyHandler implements RequestHandler,String> {

    @Override
    public String handleRequest(Map eventMap, Context context) {
        LambdaLogger logger = context.getLogger();
        logger.log("Body:" + eventMap.get("body"));
        logger.log("Headers:" + eventMap.get("headers"));
        logger.log("Method:" + eventMap.get("method"));
        logger.log("Params:" + eventMap.get("params"));
        logger.log("Query:" + eventMap.get("query"));
        return("{}");
    }
}