I\'m not sure where I\'m suppose to put this in my Asp.net MVC website:
HttpContext.Current.Response.AppendHeader(\"P3P\", \"CP=\\\\\\\"IDC DSP COR ADM DEVi
You should create a class that inherits ActionFilter and overrides OnResultExecuting() to add that header.
ActionFilter
OnResultExecuting()
Then, add it to the global filters collection.