Blazor WASM + reporting REST Service + TRDP with WebServiceDataSource returns 500 -> 401

[Frank]

I have a .NET 8 Blazor WASM frontend using ReportViewer with a .NET 8 Minimal API with the Telerik Report REST Service. All of this is setup and works fine when the reports (trdp) aren't doing anything complicated, but when I try to use a trdp provided to me that uses some WebServiceDataSource calls that require auth I get a 401. 

These endpoints that are being hit work using the same AuthenticationToken used to hit the telerik endpoints. 

Somehow I need to get the token I am already passing down to also go to those webservicedatasource endpoints. These endpoints are actually in the same project as the telerik report service and work fine on their own with the token

[Dimitar]

Hello Frank,

Thank you for the screenshots and the additional information!

Indeed, the authentication token provided to the report viewer is not automatically passed down to the WebServiceDataSource component.

The recommended solution is to create a report parameter whose value will be passed to an Authorization request header in the WebServiceDataSource - Using Parameters with WebServiceDataSource explained with examples - Telerik Reporting. For example:

Please give this approach a try and let me know if you need further assistance.

Regards,
Dimitar
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