Add Heartbeat middleware (thanks to @olivernn)

.ruby-version

@@ -0,0 +1 @@
+1.9.3-p374

Gemfile.lock

@@ -93,12 +93,12 @@ GEM
     polyglot (0.3.3)
     powder (0.1.6)
       thor (>= 0.11.5)
-    rack (1.3.8)
+    rack (1.3.9)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-mount (0.8.3)
       rack (>= 1.0.0)
-    rack-ssl (1.3.2)
+    rack-ssl (1.3.3)
       rack
     rack-test (0.6.2)
       rack (>= 1.0)

app/middleware/heartbeat.rb

@@ -0,0 +1,17 @@
+class Heartbeat
+  def initialize(app)
+    @app = app
+  end
+
+  def call(env)
+    if env['PATH_INFO'] == '/heartbeat'
+      [
+        200,
+        {"Content-Type" => "text/plain"},
+        ["OK"]
+      ]
+    else
+      @app.call(env)
+    end
+  end
+end

config/application.rb

@@ -48,6 +48,9 @@ module DanBarberPhoto
     # Prefer SASS syntax for stylesheets
     config.sass.preferred_syntax = :sass
 
+    # Heartbeat
+    config.middleware.insert_before 0, 'Heartbeat'
+
     # Rack Middleware
     config.middleware.use ::ExceptionNotifier, :email_prefix => "[DanBarberPhoto] ",
                                                :sender_address => %{"Exception Notification" <notifier@danbarberphoto.com>},