Keep Alive Connection is not returned in response header by IIS 7.5

I am using IIS 7.5.  I am working on a MVC framework.

I am sending a request with a header "Connection = Keep-Alive" and the request is being processed and when i get a response , the Connection:Keep alive is stripped off.

I am using HTTP 1.1, the IIS has got Enable Keep-Alive Settings checked. If i uncheck this setting, my response has "Connection= Close"

I have the Response Header's configuartion in IIS set to KEEP-ALIVE.

But still i dont see the Connection header in my response.

Also I have my <httpProtocol> settings in my configuarion. Still didnt work. Any help will be highly appreciated.

The third party component that am using is explictly looking for the Connection header in the response for making persistent connection and hence i need a way to have them in the response header

Can any one tell me a way how to get Connection=Keep-Alive in response header in IIS7.5.