hi Mayank,
i am not working on this SAPUI5 Simple proxy servlet in my project, so i have created an Apache proxy server in local system, so that i can test with my application with IP address, from any of the other systems(which are in same domain.) here i am by passing the proxy, by using same origin policy.
in my case, its working.
for more information see below link, to resolve Same Origin Policy issues.
Solving "Same Origin Policy" Issue in different ways
regards,
Prasad