I'm working on providing secure remote access to our corporate web map application. We use a reverse proxy to authenticate users and send all ArcGis REST requests through a proxy.ashx handler and then impersonate an account to make the call to ArcGis Server. Requests to the proxy are being discarded by the reverse proxy because they contain double encoded query parameters. In a future version, could esri provide a mechanism where the developer could replace the current proxyUrl method with custom functionality?
Cheers,
Jay