Code issue with AWS SAM Local example in docs

products.js

'use strict';

// http://docs.aws.amazon.com/lambda/latest/dg/test-sam-local.html#sam-cli-simple-app
// This is the corrected code for the url above. Specifically, the example for 
// product.js does not return`body`, `header`, nor `statusCode` for GET, PUT and 
// DELETE methods. Original code is included at the bottom.

exports.handler = (event, context, callback) => {

  let id = event.pathParameters.product || false;
  switch(event.httpMethod){

    case "GET":
      if(id) {
        callback(null, { body: "This is a READ operation on product ID " + id )};
        return;  
      }
      callback(null, { body: "This is a LIST operation, return all products" });
      break;

    case "POST":            
      callback(null, { body: "This is a CREATE operation" }); 
      break;

    case "PUT": 
      callback(null, { body: "This is a UPDATE operation on product ID " + id });
      break;

    case "DELETE": 
      callback(null, { body: "This is a DELETE operation on product ID " + id });
      break;

    default:
      // Send HTTP 501: Not Implemented
      console.log("Error: unsupported HTTP method (" + event.httpMethod + ")");
      callback(null, { statusCode: 501 })
  }
}
  
/*
'use strict';

exports.handler = (event, context, callback) => {

    let id = event.pathParameters.product || false;
    switch(event.httpMethod){

        case "GET":

            if(id) {
                callback(null, "This is a READ operation on product ID " + id);
                return;  
            } 

            callback(null, "This is a LIST operation, return all products");
            break;

        case "POST":            
            callback(null, {body: "This is a CREATE operation"}); 
            break;

        case "PUT": 
            callback(null, "This is a UPDATE operation on product ID " + id);
            break;

        case "DELETE": 
            callback(null, "This is a DELETE operation on product ID " + id);
            break;

        default:
            // Send HTTP 501: Not Implemented
            console.log("Error: unsupported HTTP method (" + event.httpMethod + ")");
            callback(null, { statusCode: 501 })

    }

}
*/