Issue while processing HEAD and GET request in rails 3

Currently we are facing issue for processing the HEAD and GET request. Let me explain the detailed scenario

We have integrated inbound and outbound SMS facility in our application.

But from last 2-3 months we are getting 2-3 times GET request from the SMS service provider and it is affecting on our system.

After long discussion with SMS service provider, they are saying "Both Head and Get requests are handled similarly from your end"

I also referred this link. You can find respective logs at this link

So can any one suggest how to resolve this issue.