Response for preflight has invalid HTTP status code 405

Question

I have read many similar problems in StackOverflow, but the solutions doesn\'t work for me.

I have WCF REST service:

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Answer 1

I want to show what work for me.

First you must enable CORS on web.config (like Mihai sad):

If you have some extra HEADER parameter, you must add it to Access-Control-Allow-Headers, like:

And finally, to handle OPTIONS requests you must reply with empty response, adding in your application class:

protected void Application_BeginRequest()
{
    if (Request.Headers.AllKeys.Contains("Origin") && Request.HttpMethod == "OPTIONS")
    {
        Response.Flush();
    }
}