Keep a session alive while file uploads
https://stackoverflow.com/questions/24541130/how-to-keep-a-session-alive-while-a-file-uploads
http://www.webdevbros.net/2006/12/14/keep-session-alive-with-javascript/
http://www.theserverside.com/discussions/thread/20125.html
Servicio de atención al cliente por UserEcho
Ideas
