The patch you didn't want to see

the_patch_you_didnt_want_to_see.diff

diff --git a/bin/browserid b/bin/browserid
index 5802ba3..482108e 100755
--- a/bin/browserid
+++ b/bin/browserid
@@ -26,7 +26,8 @@ metrics = require('../lib/metrics.js'),
 logger = require('../lib/logging.js').logger,
 forward = require('../lib/http_forward'),
 shutdown = require('../lib/shutdown'),
-views = require('../lib/browserid/views.js');
+views = require('../lib/browserid/views.js'),
+postprocess = require('postprocess');
 
 var app = undefined;
 
@@ -180,6 +181,18 @@ app.use(function(req, res, next) {
   next();
 });
 
+// replace urls in CSS with perma urls with far future expiration for
+// optimal caching
+app.use(postprocess(function(req, content) {
+  if (req.res.getHeader('content-type').indexOf('text/css') === 0) {
+    content = content.toString().replace(
+        /url(\s*\'([^\']*)\'\s*)/, function(str, url) {
+          return "url('" + cachify.hashify(url) + "')";
+        });
+  }
+  return content;
+}));
+
 app.use(express.static(static_root));
 
 // open the databse