在Global.aspx文件里添加
protected void Application_BeginRequest()
{
if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
{
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", Request.Headers["Origin"]);
HttpContext.Current.Response.StatusCode = 204;
}
}
此方法不需要Response.End(),要不然无法进行下面的请求