"Cors cross-domain" H5 js cross-domain upload file, C # server-side receive

H5 Native JS file upload, with progress.

JS Code:

<! DOCTYPE html>
C # section
public void ProcessRequest (HttpContext context)        {            httpfilecollection files =context. Request.Files;            if (Files! = null && files. Count > 0)            {                string filename = files[0]. FileName;                var filesave = "e:\\file\\" + filename;                Files[0]. SaveAs (FileSave);            }            Context. Response.ContentType = "Text/plain";            Context. Response.Write ("Hello World");        }
C # Configuration Cors allows the request header (via Webconfig configuration), tried to write to the global way get can, post no (not in global section Code), no solution found
<system.webServer>    
"Cors cross-domain" H5 js cross-domain upload file, C # server-side receive