CORS problem making ajax call to a web service

Hello

I have a problem with CORS.

I need to call a web service from 2 domains. In my web.config I added headers:

CORS works well, but I don't like * in the Origin. I try do do the same in Application_BeginRequest:

if (HttpContext.Current.Request.HttpMethod == "OPTIONS")

{

//These headers are handling the "pre-flight" OPTIONS call sent by the browser

HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "http://localhost:3312");

HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST");

HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Accepts, Content-Type, Origin, X-My-Header");

HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "60");

HttpContext.Current.Response.End();

}

My idea was to put request host in the Origin as I'm allowed to have only 1 Origin domain.

When I check headers in the browser they looks the same but I have CORS error " The Same Origin Policy disallows reading the remote resource..." What to do to get it working?