How to add a header authorization for report service
To add an authorization header for the report service, use the ajaxBeforeLoad event in the Bold Reports® Report Viewer and Report Designer components to send headers from the client side to the server side. The following guides show how to add the authorization headers for each platform.
Header authorization for JavaScript Report Viewer
Header authorization for ASP.NET Web Forms Report Viewer
Header authorization for ASP.NET MVC Report Viewer
Header authorization for ASP.NET Core Report Viewer