Use the X-Request-ID request header when request_id present

lib/carto/named_maps/api.rb

@@ -129,6 +129,8 @@ module Carto
           'content-type': 'application/json',
           'host': domain(username)
         }
+        headers = request_id ? @headers.merge('X-Request-ID': request_id) : @headers
+        headers
       end
 
       def domain(username)
@@ -139,6 +141,10 @@ module Carto
         CartoDB.subdomainless_urls? ? config_domain : "#{username}.#{config_domain}"
       end
 
+      def request_id
+        Carto::CurrentRequest.request_id
+      end
+
       def port
         @port ||= Cartodb.get_config(:tiler, 'internal', 'port')
       end