Disclosed herein is a system comprising: a networking device, a storage, and a proxy server, wherein the proxy server is configured to identify a first group of contents from first data received from a content server, to modify the first data to generate second data by replacing the first group of contents with labels, and to transmit the second data to the networking device; wherein the networking device is configured to read the labels in the second data, to request contents from the storage based on the labels, to replace the labels with the contents received from the storage to generate third data, to transmit the third data to a mobile device.