zepot post没有问题，用plupload上传出现了这个错误，options过不去。显示Response for preflight has invalid http status code 405
在global中处理下option
protected void Application_BeginRequest()
{
if (Request.Headers.AllKeys.Contains("Origin") && Request.HttpMethod == "OPTIONS")
{
Response.End();
}
}
另外，还要注意header的设定。多个允许的自定义header逗号隔开。不然也会被拒绝。
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Headers" value="Content-Type,Token" />
<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
</customHeaders>
</httpProtocol>