ERR_EMPTY_RESPONSE with Spring MVC ,angular, tomcat on ec2

I have developed an application with spring MVC,Angular.js which tries to scrap the data from url's. When I run this application on my local instance which is on my laptop its working flawlessly. I have deployed same application on Amazon ec2 instance the landing page got loaded but when I submit the URL it has to return as json data but I am getting an error message as

Failed to load resource: net::ERR_EMPTY_RESPONSE

When I inspect the elements on google chrome but server running successfully behind and I could see the log info on tomcat console. What could be the problem here?