关于 webapi ajax进度条信息设置

1、Web.config 设置跨域

<httpProtocol><customHeaders><add name="Access-Control-Allow-Origin" value="*" /><add name="Access-Control-Allow-Headers" value="Content-Type" /><add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE,OPTIONS" /></customHeaders>
</httpProtocol>

2、Global.asax中配置OPTIONS

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