Allow set http headers for request

Allow set http headers for drupal_http_request on configuration form. In my case, I need to disallow direct URL access to images on production site with code in .htaccess similar to

# Disallow direct URL access to images.
  RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?example.com [NC]
  RewriteRule .*\.(jpg|jpeg|png|gif)$ - [NC,F,L]

But I still want to load images from production to local machine. So, I'd like to set Referer header for the request.