log forwarded host

config/environments/production.rb

@@ -59,7 +59,7 @@ Rails.application.configure do
                                        .then { |logger| ActiveSupport::TaggedLogging.new(logger) }
 
   # Prepend all log lines with the following tags.
-  config.log_tags = %i[request_id host]
+  config.log_tags = %i[request_id forwarded_host]
 
   # Info include generic and useful information about system operation, but avoids logging too much
   # information to avoid inadvertent exposure of personally identifiable information (PII). If you

config/initializers/log_tags.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+module RequestExtension
+  def forwarded_host
+    headers["X-Forwarded-Host"] || host
+  end
+end
+
+ActiveSupport.on_load(:action_dispatch_request) { include RequestExtension }

docker-compose.prod.yml

@@ -1,5 +1,3 @@
-version: "3"
-
 x-environment: &common-env
   WEBSITES_READONLY: "${READONLY:-0}"
 

docker-compose.yml

@@ -1,5 +1,3 @@
-version: "3"
-
 x-environment: &common-env
   WEBSITES_READONLY: "${READONLY:-0}"