Getting upload progress from the gateway

[sximba]

I have been looking into this for some time and I just can't figure out how to pass a callback from my application to the gateway for updates on upload progress. I did try using Google/StackOverflow but found nothing. I looked at the code and saw that mappersmith takes everything passed to it that is not an expected special request attr and puts it as a URL param.

Any ideas how to do this?

If it is not possible, what changes would need to be made to support this? I'd be happy to work on it. I am just not sure I have a great idea of how to implement this