From e202fe8c760d8e63a26cbac116dc94d5039fb207 Mon Sep 17 00:00:00 2001
From: Lin Jen-Shin <godfat@godfat.org>
Date: Thu, 28 Dec 2017 21:55:34 +0800
Subject: [PATCH] Warm up the app so it's fast for the 1st request

This would make the application considered ready much slower,
but when it's ready, then it's really ready. Before this change,
it claims to be ready, but it's annoyingly slow for the first
request with GDK. It's 100% 502 for me, for the first request.

This shouldn't really affect production or so, because if it's
really ready, it should be blazingly fast, and it should not
slow things down too much.

The culprit here is probably `ActionController::Base.helpers.asset_path`
but this could make sure that anything else would load first, too.
---
 config.ru | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/config.ru b/config.ru
index 065ce59932f2f..de0400f4f67b2 100644
--- a/config.ru
+++ b/config.ru
@@ -17,6 +17,11 @@ end
 
 require ::File.expand_path('../config/environment',  __FILE__)
 
+warmup do |app|
+  client = Rack::MockRequest.new(app)
+  client.get('/')
+end
+
 map ENV['RAILS_RELATIVE_URL_ROOT'] || "/" do
   run Gitlab::Application
 end
-- 
GitLab