.net mvcwebapi设置允许跨域

 
global.asax中    
   //解决跨域问题
        protected void Application_BeginRequest(object sender, EventArgs e)
        {
            //RegisterRoutes(RouteTable.Routes);
            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();
            }
            else
            {
                HttpContext.Current.Response.AddHeader("Cache-Control", "no-cache");

                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST,PUT, DELETE");
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type");
            }
        }

web.config中

  <!--解决跨域问题-->
    <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Max-Age" value="30" />
        <add name="Access-Control-Allow-Methods" value="GET,POST,OPTIONS" />
        <add name="Access-Control-Allow-Headers" value="Content-Type, Accept" />
      </customHeaders>
    </httpProtocol>

iis

网站的应用程序池 管道模式必须是经典模式 ,否则不行