CORS enabled but response for preflight has invalid HTTP status code 404 when POSTing JSON

Question

I\'ve searched thoroughly but cannot find a solution to this issue in my particular circumstance.

Cross-domain service calls using Fiddler (POST) execute correctly a

Answer 1

This helped me too, I had CORS configured in web.config already

protected void Application_BeginRequest(Object sender, EventArgs e)
{
    //HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
    if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
    {
        HttpContext.Current.Response.AddHeader("Cache-Control", "no-cache");
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST");
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
        HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
        HttpContext.Current.Response.End();
    }
}