Stop jaggery server if it is running.
Go to <jaggery-Home>/bin/ from CMD
Entry 'server.bat -Dhttp.proxyPort=<proxy-port> -Dhttp.proxyHost=<proxy-host>'
server.bat -Dhttp.proxyPort=8085 -Dhttp.proxyHost=localhost
Now jaggery server/ Apps will running inside proxy server.
To test this you can try tcp moon. (for http calls)
[4.2]Create new tcpmoon proxy that is listerning to that prxoy port (Here is 8085)
[4.3]Go to the tap 'port 8085' in tcp moon
 Send jaggery web request (You can try it from jaggery documentation)
you will see the page in tryit.jag
Go to tcpmoon port 8085
you will see that message that send from jaggery