no matter what I put for useProxy:true or useProxy:false or completely remove this parameter, I can see the request going through proxy.ashx in firebug and its giving me error "Unable to Load Proxy page"
@vikrant retry your request, then check the web server log files for the full error message. If you have the ability, also try opening a web browser on the web server and running the same application using the localhost domain name; e.g. http://localhost/myapp.html. For security reasons, many production web servers are configured to not return the full error message to a remote client. However, if you run it locally you may be able to see the error.