How can I add a custom header value to the response?  I try:

Response.Headers.Add("MyHeader", "Value");
Response.AddHeader("MyHeader", "Value");
Response.AppendHeader("MyHeader", "Value");

nothing works.  A lot of times I get a message about IIS integrated pipeline
mode needing to be enabled, but as far as I can tell that's only on IIS 7??

If anyone has any ideas, I'd be appreciative.  I'm trying to do this in an
HttpModule.  The custom header values will be consumed by a legacy
application, so I HAVE to do it this way.

Thanks,

Jeff