How to read response header

Hi,

We are using Fiori framework and directly binding a odataservice(entity of a odata service) to a table like following

<Table id="dTable" mode="MultiSelect" updateStarted="handleStarted" 

  items="{/testCollection}" selectionChange="enableDisableButtons">

We are using ODataModel in our view. The model itself triggers the OData service and bind the data. Now we have some custom response headers which we return with the service. We are unable to read the custom header in the requestCompleted event also. Please assist us here and please let us know how we can read these custom response headers

Regards,

Nandakumar