From 5094956f7c8d4878d20ba3cc72ce0ded5a5842f3 Mon Sep 17 00:00:00 2001
From: Hakan Ensari <me@hakanensari.com>
Date: Tue, 15 Sep 2015 12:01:16 +0100
Subject: [PATCH] Add Last Modified header

---
 lib/api.rb       |  3 +++
 spec/api_spec.rb | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/lib/api.rb b/lib/api.rb
index 52c2701..66d8306 100644
--- a/lib/api.rb
+++ b/lib/api.rb
@@ -53,11 +53,14 @@ get '/' do
 end
 
 get '/latest' do
+  last_modified quote[:date]
   jsonp quote
 end
 
 get(/(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/) do
   transform_date
+  last_modified quote[:date]
+
   jsonp quote
 end
 
diff --git a/spec/api_spec.rb b/spec/api_spec.rb
index ab78554..e1a5eb3 100644
--- a/spec/api_spec.rb
+++ b/spec/api_spec.rb
@@ -40,6 +40,16 @@ describe 'the API' do
     json['rates'].wont_be :empty?
   end
 
+  it 'returns a last modified header for latest quote' do
+    get '/latest'
+    headers['Last-Modified'].wont_be_nil
+  end
+
+  it 'returns a last modified header for historical quote' do
+    get '/2012-11-20'
+    headers['Last-Modified'].wont_be_nil
+  end
+
   it 'allows cross-origin requests' do
     get '/', {}, 'HTTP_ORIGIN' => 'http://localhost'
     assert_equal 'http://localhost', headers['Access-Control-Allow-Origin']