Using relative swagger endpoint results in error

The documentation states, that when using reverse proxy, the Swagger endpoint should be set to a relative path using the `./` prefix. For example, `./swagger/v1/swagger.json` as shown in the screenshot bellow:

Doing so results in error:

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#### Document Details

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* ID: 14fce65f-1337-58cb-2193-8d8e0e62792d
* Version Independent ID: 59222460-a971-e76e-4fe9-23d4d7d768ee
* Content: [Get started with Swashbuckle and ASP.NET Core](https://docs.microsoft.com/en-us/aspnet/core/tutorials/getting-started-with-swashbuckle?view=aspnetcore-6.0&tabs=visual-studio&viewFallbackFrom=aspnetcore-2.2)
* Content Source: [aspnetcore/tutorials/getting-started-with-swashbuckle.md](https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/tutorials/getting-started-with-swashbuckle.md)
* Product: **aspnet-core**
* Technology: **aspnetcore-tutorials**
* GitHub Login: @zuckerthoben
* Microsoft Alias: **scaddie**