From 9591fdc4c66c2f6a327dde52b67539320fc01249 Mon Sep 17 00:00:00 2001
From: Piotr Sarnacki <drogus@gmail.com>
Date: Fri, 6 Feb 2015 10:54:23 +0100
Subject: [PATCH] Set expires to and max-age to 0 for index.html

This ensures that chrome will not indifinitely cache the index.html file.
---
 waiter/lib/travis/web/app.rb | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/waiter/lib/travis/web/app.rb b/waiter/lib/travis/web/app.rb
index af5c1b26..ed81a768 100644
--- a/waiter/lib/travis/web/app.rb
+++ b/waiter/lib/travis/web/app.rb
@@ -87,7 +87,7 @@ class Travis::Web::App
           'Cache-Control'    => cache_control(file),
           'Content-Location' => path_for(file),
           'Content-Type'     => mime_type(file),
-          'Expires'          => (server_start + age).httpdate,
+          'Expires'          => expires(file),
           'ETag'             => fingerprint(file)
         }
       else
@@ -100,7 +100,7 @@ class Travis::Web::App
           'Content-Location' => path_for(file),
           'Content-Type'     => mime_type(file),
           'Last-Modified'    => server_start.httpdate,
-          'Expires'          => (server_start + age).httpdate,
+          'Expires'          => expires(file),
           'Vary'             => vary_for(file),
           'ETag'             => Digest::MD5.hexdigest(content)
         }
@@ -132,11 +132,18 @@ class Travis::Web::App
 
     def cache_control(file)
       case path_for(file)
-      when '/'        then "public, must-revalidate"
+      when '/'        then "public, must-revalidate, max-age=0"
       else "public, max-age=#{age}"
       end
     end
 
+    def expires(file)
+      case path_for(file)
+      when '/' then '0'
+      else (server_start + age).httpdate
+      end
+    end
+
     def vary_for(file)
       case path_for(file)
       when '/'         then 'Accept'