ASP.NET WEBAPI MVC服务返回页面并继续处理异步多线程？

We have a WEBAPI service running on a windows asp.net MVC solution. There is a load method that takes about 40 minutes to complete and return status on the called page. During that time the browser window is tied up. What design options do we have if we want the web page to come back with submitted and the process to continue to run and complete. I don't care if page never shows complete, we can pull that from another status page.We have a WEBAPI service running on a windows a