reinstate 304

lib/cartodb/cartodb_windshaft.js

@@ -9,9 +9,9 @@ var CartodbWindshaft = function(serverOptions) {
     // set the cache chanel info to invalidate the cache on the frontend server
     serverOptions.afterTileRender = function(req, res, tile, headers, callback) {
         res.header('X-Cache-Channel', req.params.dbname);
-// note - not invalidating properly        
-//        res.header('Last-Modified','Wed, 30 Aug 1978 00:00:00 GMT'); // special date in the past. 
-//        res.header('Cache-Control','no-cache,must-revalidate, public');
+        // note - may not be invalidating properly
+        res.header('Last-Modified', new Date().toUTCString());
+        res.header('Cache-Control', 'no-cache,must-revalidate, public');
         callback(null, tile, headers);
     };
 

lib/cartodb/varnish.js

@@ -20,7 +20,7 @@ function VarnishClient(host, port, ready_callback) {
 
     connect();
 
-    client.on('data', function(data) {
+    client.on('data', function (data) {
         data = data.toString();
         lines = data.split('\n', 2);
         if(lines.length == 2) {