WebAPI deal with cross-domain issues

　　1, according to https://dzone.com/articles/access-control-allow-origin-header-and-the-aspnet article said, the program configured to allow cross-domain request.

                             

     　　But the request is still wrong.

　　2, the following error message:

　　　　Response to preflight request doesn't pass access control check: It does not have HTTP ok status.

　　3, the browser tries to request the server interface data

　　　　The following error message:

 　　　　

　　　　Solution:

　　　　 

　　　　Comment out the above information can be a normal visit.