pass header information with a .getTile() request

lib/mbtiles.js

@@ -24,14 +24,19 @@ MBTiles.utils = require('./utils');
 // - callback: Will be called when the resources have been acquired
 //       or acquisition failed.
 function MBTiles(uri, callback) {
+    var mbtiles = this;
     if (typeof callback !== 'function') callback = noop;
     if (typeof uri === 'string') uri = url.parse(uri);
 
     this.filename = uri.pathname;
-    this.db = new sqlite3.cached.Database(uri.pathname, function(err) {
+    this.db = new sqlite3.cached.Database(mbtiles.filename, function(err) {
         if (err) return callback(err);
-        else callback(null, this);
-    }.bind(this));
+        else fs.stat(mbtiles.filename, function(err, stat) {
+            if (err) return callback(err);
+            mbtiles.stat = stat;
+            callback(null, mbtiles);
+        });
+    });
 };
 
 // Finds all mbtiles file in the filepath and returns their tilesource URI.
@@ -279,7 +284,14 @@ MBTiles.prototype.getTile = function(z, x, y, callback) {
         function(err, row) {
             if (!row || (err && err.errno == 1)) callback(new Error('Tile does not exist'));
             else if (err) callback(err);
-            else callback(null, row.tile_data);
+            else {
+                var options = {
+                    'Content-Type': MBTiles.utils.getMimeType(row.tile_data),
+                    'Last-Modified': mbtiles.stat.mtime,
+                    'E-Tag': mbtiles.stat.size + '-' + Number(mbtiles.stat.mtime)
+                };
+                callback(null, row.tile_data, options);
+            }
         });
 };