[Discussion] Hosting no longer adds default server address when no address is explicitly configured

[JunTaoLuo]

Discussion for aspnet/Announcements#224.

[natemcmaster]

Can you clarify what changes developers should make in their apps to react to this change?

[JunTaoLuo]

Our servers have been updated in aspnet/HttpSysServer#297 and aspnet/HttpSysServer#297 so if Kestrel or HttpSysServer is being used, no changes are required.

If you are implementing a server and rely on the IServerAddressesFeature to be set by hosting, that will no longer be set and a default should be added when no address is configured. As an example:

var serverFeatures = featureCollection.Get<IServerAddressesFeature>();
if (serverFeatures .Addresses.Count == 0)
{
    ListenOn(DefaultAddress); // Start the server on the default address
    serverFeatures.Addresses.Add(DefaultAddress) // Add the default address to the IServerAddressesFeature
}

Note that for Kestrel and HttpSysServer, the priority for address resolution is

1. Direct configuration via KestrelServerOptions.Listen() or HttpSysOptions.UrlPrefixes.Add()
2. List of addresses in IServerAddressesFeature.Addresses
3. Default address chosen by the server

[muratg]

We are closing this issue because no further action is planned for this issue. If you still have any issues or questions, please log a new issue with any additional details that you have.