Adding multiple Set-Cookie Headers in ASP.NET Web

Question

I faced a problem.

When you add multiple Set-Cookie headers to the response

headers.Add("Set-Cookie", "a=b;Path=/;");
headers.Add("Set-Cookie", "c=d;Path=/;");

actually they are combined and only one header is sent with comma-separated cookies

Set-Cookie: a=b;Path=/;,c=d;Path=/;

According to RFC2109 it is a valid syntax. But it is not according to RFC6265, which deprecates RFC2109

Moreover latest browsers does not support this comma-separated syntax as well. Tested on IE9, Firefox 13 and Google Chrome 20.

All of these browsers took first cookie only.

Please see the sample project below

I want to find some workaround.

I expect to have two different Set-Cookie headers.

I tried to write some MessageInspector to rewrite HTTP headers. I could not find how to access that headers.

Any ideas?

P.S. Used technology: Web API