I'm working on an app and would like to use http post to upload a file. I'm pretty sure my code is ok and I get no errors doing the post but the file does not appear in my space. I imagine some server side facility is needed to accept the post and do something with it. What I'd like to have happen is for the posted file to replace any existing file with the same name and that this be done as cleanly as possible so that the app and any user web references don't collide.

Is there something I can do to make that happen?