WopiHost is a Asp.NET MVC 5 application. Works with Office Web Apps Server.
You need replace WopiHost/App_Data/Discovery.xml with content of https://your-owa-server-url/hosting/discovery
Example of wopi host application
WopiHost is a Asp.NET MVC 5 application. Works with Office Web Apps Server.
You need replace WopiHost/App_Data/Discovery.xml with content of https://your-owa-server-url/hosting/discovery
Example of wopi host application