How to control the HTTP response Cache-Control of a Vaadin AbstractJavaScri

I wrote a Vaadin PDF component by using the class AbstractJavaScriptComponent and some JavaScript libraries. The size of all JavaScript libraries are about 1MB. I’m using Vaadin 7.3.x.

The web clients running in a local area network connected with low bandwidth (VPN) to the server. Vaadin provide these libraries with “max-age” of 3600 seconds.
This means that the web browser will cache these libraries for one hour and will download it again even the libraries hasn’t been changed.

Is there a way or a best practice how to control the “Cache-Control” property in the HTTP response?