Dubugging

Is there a method to debug hosted ruby on rails application and check the request and response object

Typically you'll install an error tracking tool like Airbrake, Sentry, Rollbar, etc and then inspect the logs to see what happened. You can then try and reproduce the error in your development environment.

Sometimes using something like devise_masquerade is helpful so you can login to a problem account and see what's going on first-hand.

Do the check several times

And always make exceptions.