Can't retrieve user country from AWS CloudFront

Question

I've an static application running on CloudFront hosted by S3, and I'm trying to receive user country in my API running on EC2, without success.

CloudFront configuration:

S3 CORS configuration:

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
   <CORSRule>
      <AllowedOrigin>*</AllowedOrigin>
      <AllowedOrigin>http://*</AllowedOrigin>
      <AllowedOrigin>https://*</AllowedOrigin>
      <AllowedMethod>GET</AllowedMethod>
      <MaxAgeSeconds>3000</MaxAgeSeconds>
      <AllowedHeader>*</AllowedHeader>
      <AllowedHeader>CloudFront-*</AllowedHeader>
   </CORSRule>
</CORSConfiguration>

Preflight (OPTIONS) result from my API:

Access-Control-Allow-Credentials → true
Access-Control-Allow-Headers → Content-Type, User-Agent, Origin, Authorization, CloudFront-Viewer-Country
Access-Control-Allow-Methods → GET, POST, PUT, DELETE, OPTIONS
Access-Control-Allow-Origin → *
Access-Control-Expose-Headers → Authorization
Access-Control-Max-Age → 45537
Access-Control-Request-Headers → Content-Type, User-Agent, Origin, Authorization, CloudFront-Viewer-Country

I need to receive this header (CloudFront-Viewer-Country) into requests on my API for security purpose, but I'm not receiving it actually.

Received requests on EC2:

OPTIONS

{
  "method": "OPTIONS",
  "path": "/languages/translate",
  "headers": {
    "request": {
        "host": "xxxxxxxxx.us-west-2.elb.amazonaws.com",
        "accept": "*/*",
        "accept-encoding": "gzip, deflate, sdch",
        "accept-language": "en-US,en;q=0.8,pt;q=0.6,pt-BR;q=0.4",
        "access-control-request-headers": "accept, accept-language, authorization",
        "access-control-request-method": "GET",
        "cache-control": "no-cache",
        "origin": "http://xxxxxxxxxxxx.cloudfront.net",
        "pragma": "no-cache",
        "referer": "http://xxxxxxxxx.cloudfront.net/",
        "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36",
        "via": "1.1  (squid/3.4.10)",
        "x-forwarded-for": "192.168.8.68, XXX.XXX.XXX.XX",
        "x-forwarded-port": "80",
        "x-forwarded-proto": "http",
        "connection": "keep-alive"
      },
      "response": {
        "X-Content-Type-Options": "nosniff",
        "X-XSS-Protection": "1; mode=block",
        "Cache-Control": "no-cache, no-store, max-age=0, must-revalidate",
        "Pragma": "no-cache",
        "Expires": "0",
        "X-Frame-Options": "DENY",
        "Access-Control-Allow-Origin": "*",
        "Access-Control-Allow-Methods": "GET",
        "Access-Control-Allow-Methods": "POST",
        "Access-Control-Allow-Methods": "PUT",
        "Access-Control-Allow-Methods": "DELETE",
        "Access-Control-Allow-Methods": "OPTIONS",
        "Access-Control-Max-Age": "61032",
        "Access-Control-Allow-Credentials": "true",
        "Access-Control-Allow-Headers": "Content-Type",
        "Access-Control-Allow-Headers": "User-Agent",
        "Access-Control-Allow-Headers": "Origin",
        "Access-Control-Allow-Headers": "Authorization",
        "Access-Control-Allow-Headers": "CloudFront-Viewer-Country",
        "Access-Control-Request-Headers": "Content-Type",
        "Access-Control-Request-Headers": "User-Agent",
        "Access-Control-Request-Headers": "Origin",
        "Access-Control-Request-Headers": "Authorization",
        "Access-Control-Request-Headers": "CloudFront-Viewer-Country",
        "Access-Control-Expose-Headers": "Authorization",
        "Authorization": "Bearer XXXXXXXXXXXX",
        "X-Application-Context": "application",
        "Allow": "GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, PATCH",
        "status": "200"
      }
   }
}

GET

{
  "method": "GET",
  "path": "/languages/translate",
  "headers": {
    "request": {
        "host": "xxxxxxxxxxx.us-west-2.elb.amazonaws.com",
        "accept": "application/json, text/plain, */*",
        "accept-encoding": "gzip, deflate, sdch",
        "accept-language": "1",
        "authorization": "Bearer XXXXXXXXXX",
        "cache-control": "no-cache",
        "origin": "http://xxxxxxxxx.cloudfront.net",
        "pragma": "no-cache",
        "referer": "http://xxxxxxxxxxx.cloudfront.net/",
        "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36",
        "via": "1.1 (squid/3.4.10)",
        "x-forwarded-for": "192.168.8.68, XXX.XXX.XXX.XX",
        "x-forwarded-port": "80",
        "x-forwarded-proto": "http",
        "connection": "keep-alive"
    }
  }
}