UseIISIntegration should set IServerAddresses.PreferHostingUrls

[Tratcher]

When running behind IIS ANCM should override any Kestrel endpoint configuration by setting PreferHostingUrls

IISIntegration/src/Microsoft.AspNetCore.Server.IISIntegration/WebHostBuilderIISExtensions.cs

Line 54 in c420add

hostBuilder.UseSetting(WebHostDefaults.ServerUrlsKey, address);

This can clean up some ugliness from Program.Main:
https://github.com/aspnet/Security/blob/2d7cd6038fea34b84084685648ac9d0c97be610b/samples/SocialSample/Program.cs#L19

See aspnet/Hosting#992
@JunTaoLuo

[shirhatti]

Especially given the fact we are injecting UseIISIntegration, this makes me a little uncomfortable. Anything we can do to improve discoverability around this behavior?

[JunTaoLuo]

@shirhatti The servers will log if server addresses are used to override the endpoint configurations. We can have UseIISIntegration log that it's setting the PreferHostingUrls flag. Other than that, I can only think of updating docs to make this behaviour more clear.