Mapping Template Example for AWS API Gateway

#set($headers = $input.params().header)
{
    "method": "$context.httpMethod",
    "resourcePath": "$context.resourcePath",
    "queryString": "$input.params().querystring",
    "requestBody": "$input.json('$')",
    "stage": "$context.stage",
    "headers": [
        #foreach($key in $headers.keySet())
        {
            "key": "$key",
            "value": "$util.escapeJavaScript($input.params().header.get($key))"
        }
        #if($foreach.hasNext),
        #end
        #end
    ],
    "userAgent": "$context.identity.userAgent"
}

{
  "method": "GET",
  "resourcePath": "/",
  "queryString": "{}",
  "requestBody": "{}",
  "stage": "test",
  "headers": [
    {
      "key": "Accept",
      "value": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"
    },
    {
      "key": "Accept-Encoding",
      "value": "gzip"
    },
    {
      "key": "Accept-Language",
      "value": "en-US,en;q=0.8"
    },
    {
      "key": "CloudFront-Forwarded-Proto",
      "value": "https"
    },
    {
      "key": "CloudFront-Is-Desktop-Viewer",
      "value": "true"
    },
    {
      "key": "CloudFront-Is-Mobile-Viewer",
      "value": "false"
    },
    {
      "key": "CloudFront-Is-SmartTV-Viewer",
      "value": "false"
    },
    {
      "key": "CloudFront-Is-Tablet-Viewer",
      "value": "false"
    },
    {
      "key": "CloudFront-Viewer-Country",
      "value": "US"
    },
    {
      "key": "Upgrade-Insecure-Requests",
      "value": "1"
    },
    {
      "key": "Via",
      "value": "1.1 e66d582bff32cb7f7478c73177a985e9.cloudfront.net (CloudFront)"
    },
    {
      "key": "X-Amz-Cf-Id",
      "value": "xQAFSfjvzbfHq4-KmVCpIBJfYjF46L2E4Gb9HYWBoCDtLqHI4vmh_w=="
    },
    {
      "key": "X-Forwarded-For",
      "value": "108.183.183.220, 216.137.44.11"
    },
    {
      "key": "X-Forwarded-Port",
      "value": "443"
    },
    {
      "key": "X-Forwarded-Proto",
      "value": "https"
    }
  ],
  "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36"
}