Bad Response + Manifest: Line: 1, column: 1, Syntax error. + Failed to register a ServiceWorker about webessentials.aspnetcore.serviceworker

[Budsy]

This error display in Chrome and Edge developer's tools console error listing shed light on the problem when I had this same issue. The domain part of the path seemed to be missing in the request paths. I eliminated the errors by removing the BaseRoute = "/" that I had in my .NET 5 Startup configuration settings for the AddProgressiveWebApp method.

Uncaught (in promise) DOMException: Failed to register a ServiceWorker: The origin of the provided scriptURL ('https:serviceworker') does not match the current origin ('https://').

GET https://manifest.webmanifest/
net::ERR_NAME_NOT_RESOLVED

[Becca37]

Thanks, @Budsy! Since I do not have any configuration settings added to the AddProgressiveWebApp method and the error messages are different I don't think that's my issue. I'd certainly try removing a slash, if I had one. :0)

[ArisNance]

Using https:// worked for me!