Sinatra server side file upload with progress bar?

Rails
1

I am using this jquery file upload plugin. In firefox it has progress
bars, but these don’t work in IE.

We are using Sinatra/JRuby/tomcat

This is the plugin:

I believe the progress bars don’t work in IE, because IE doesn’t
support
that in ajax until version 10 and we have to support version 9.
This page summarizes that:

The post below however seems to allude that there is an apache module
in
Java that could ad the support on the server side.

Is there a way I could accomplish this with sinatra/jruby ? I am not
sure
how I would go about it

2

I’m obviously implying that the server side progress would involve a
constant ajax polling action to see the progress, but the server would
need
to tell me what the progress is