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Update web-host.md (#17212) 

* Update web-host.md

* Update web-host.md
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Rick Anderson 2020-03-04 19:44:46 -08:00 committed by GitHub
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@ -439,9 +439,7 @@ public class Program
```
> [!NOTE]
> The [UseConfiguration](/dotnet/api/microsoft.aspnetcore.hosting.hostingabstractionswebhostbuilderextensions.useconfiguration) extension method isn't currently capable of parsing a configuration section returned by `GetSection` (for example, `.UseConfiguration(Configuration.GetSection("section"))`. The `GetSection` method filters the configuration keys to the section requested but leaves the section name on the keys (for example, `section:urls`, `section:environment`). The `UseConfiguration` method expects the keys to match the `WebHostBuilder` keys (for example, `urls`, `environment`). The presence of the section name on the keys prevents the section's values from configuring the host. This issue will be addressed in an upcoming release. For more information and workarounds, see [Passing configuration section into WebHostBuilder.UseConfiguration uses full keys](https://github.com/aspnet/Hosting/issues/839).
>
> `UseConfiguration` only copies keys from the provided `IConfiguration` to the host builder configuration. Therefore, setting `reloadOnChange: true` for JSON, INI, and XML settings files has no effect.
> [UseConfiguration](/dotnet/api/microsoft.aspnetcore.hosting.hostingabstractionswebhostbuilderextensions.useconfiguration) only copies keys from the provided `IConfiguration` to the host builder configuration. Therefore, setting `reloadOnChange: true` for JSON, INI, and XML settings files has no effect.
To specify the host run on a particular URL, the desired value can be passed in from a command prompt when executing [dotnet run](/dotnet/core/tools/dotnet-run). The command-line argument overrides the `urls` value from the *hostsettings.json* file, and the server listens on port 8080: