From fd853c7a335e2da40a20ad1f041f945d09a5651f Mon Sep 17 00:00:00 2001
From: zz9pzza <zz9pzza@gmail.com>
Date: Mon, 2 Dec 2019 03:08:51 +0000
Subject: [PATCH] AO3-5832 Return 444 for Elasticsearch errors (#3701)

* Redirect Elasticsearch::Transport::Transport::Errors::ServiceUnavailable to our custom error

* Follow the hound

* AO3-5832 Add a comment for 444
---
 app/controllers/application_controller.rb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index f930b5df04c..9c90d2ee18c 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -4,6 +4,11 @@ class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception, prepend: true
   rescue_from ActionController::InvalidAuthenticityToken, with: :display_auth_error
   rescue_from ActionController::UnknownFormat, with: :raise_not_found
+  rescue_from Elasticsearch::Transport::Transport::Errors::ServiceUnavailable do
+    # Non-standard code used by nginx: closes a connection without sending
+    # a response header.
+    head 444
+  end
 
   def raise_not_found
     redirect_to '/404'