http provider

We already have an Http Listener plugin for Wowza. I want it to receive a POST request with content-type “file/png” which must end up in the content/<app_name> directory for the instance. I am kind of at a loss on how to do this, though. I have never handled post requests containing file/png, only json. How would I go about doing this? For instance, would the method getParameterMap() return something like {“file” = }? If so, then I guess I could create the file simply by using instanceOfMap.get(“file”) in the appropriate directory (which I could get by combining appInstance.getVHost().getHomePath() and appInstance.getApplication().getName(), and just adding “content/” in between). Or am I thinking about this the wrong way?