                 'Server': 'nginx'
                 'Content-Length': data.length
                 'Content-Type': mime.lookup cacheFile
-                # 'Last-Modified': stats.mtime.toGMTString()
+                'Last-Modified': stats.mtime.toGMTString()
               res.end data
           # Enable retry for game api
           else

                reqBody = JSON.stringify(querystring.parse reqBody.toString())
                self.emit 'network.on.request', req.method, [domain, pathname, requrl], reqBody
                # Create remote request
                [response, body] = yield requestAsync resolve options
                success = true
                res.writeHead response.statusCode, response.headers
                res.end body
                # Emit response events to plugins
                try
                  resolvedBody = yield resolveBody response.headers['content-encoding'], body

                else
                  self.emit 'network.error', [domain, pathname, requrl], response.statusCode
              catch e
                success = false
                error "Api failed: #{req.method} #{req.url} #{e.toString()}"
                self.emit 'network.error.retry', [domain, pathname, requrl], i + 1 if i < retries
              if success || !isKancolleGameApi pathname
