AuthorizationMessageHandler should pass through the exception message

[blanchardglen]

It would be great if the AuthorizationMessageHandler.SendAsync when it threw a AccessTokenNotAvailableException:

aspnetcore/src/Components/WebAssembly/WebAssembly.Authentication/src/Services/AuthorizationMessageHandler.cs

Line 72 in ffa0a02

throw new AccessTokenNotAvailableException(_navigation, tokenResult, _tokenOptions?.Scopes);

if it included the message from the auth server or exception as to why. e.g. login_required, timeout, no_network etc.

This will require changes to AuthenticationService.ts to pass the message from the exception:

aspnetcore/src/Components/WebAssembly/WebAssembly.Authentication/src/Interop/AuthenticationService.ts

Line 190 in ffa0a02

this.debug(`Failed to provision a token silently '${e.message}'`)

To the AccessTokenResult:

aspnetcore/src/Components/WebAssembly/WebAssembly.Authentication/src/Services/RemoteAuthenticationService.cs

Line 178 in ffa0a02

return new AccessTokenResult(

This would greatly help especially for offline/occasionally connected apps where asking for the latest data from the server is good but not critical.

Right now the only options are:

1. redirect to login which would fail because you are offline
2. manually run a check against the auth server to see if it can be contacted before you redirect to the login.
   This is messy as it requires a new custom request, config for which auth server it is and likely a cors enabled url to test against.

Thanks.