[UI] Relative Address for HealthCheckEndpoint with Kestrel at http://0.0.0.0:0

I’m trying to bind HealthCheckEndpoint using the relative address;

services.AddHealthChecksUI(setupSettings: settings => settings.AddHealthCheckEndpoint("ABC", "/health"));

but because it is configured to use http://0.0.0.0:0 in Kestrel, it throws an exception. I’m not hard set on using automatic port selection, though it is nice for testing. It throws the same exception when using a specific port, though.

2020-02-07 10:37:31.3948|WARN|Microsoft.AspNetCore.Server.Kestrel|Overriding address(es) 'https://localhost:5001'. Binding to endpoints defined in UseKestrel() instead.|
info: Microsoft.Hosting.Lifetime[0]
      Now listening on: http://0.0.0.0:51713
2020-02-07 10:37:31.5178|INFO|Microsoft.Hosting.Lifetime|Now listening on: http://0.0.0.0:51713|
info: Microsoft.Hosting.Lifetime[0]
      Now listening on: https://0.0.0.0:51714
2020-02-07 10:37:31.5178|INFO|Microsoft.Hosting.Lifetime|Now listening on: https://0.0.0.0:51714|
fail: HealthChecks.UI.Core.HostedService.HealthCheckReportCollector[0]
      GetHealthReport threw an exception when trying to get report from /health configured with name TransactionServer.
System.Net.Http.HttpRequestException: IPv4 address 0.0.0.0 and IPv6 address ::0 are unspecified addresses that cannot be used as a target address. (Parameter 'hostName')
 ---> System.ArgumentException: IPv4 address 0.0.0.0 and IPv6 address ::0 are unspecified addresses that cannot be used as a target address. (Parameter 'hostName')
   at System.Net.Dns.HostResolutionBeginHelper(String hostName, Boolean justReturnParsedIp, Boolean throwOnIIPAny, AsyncCallback requestCallback, Object state)
   at System.Net.Dns.BeginGetHostAddresses(String hostNameOrAddress, AsyncCallback requestCallback, Object state)
   at System.Net.Sockets.MultipleConnectAsync.StartConnectAsync(SocketAsyncEventArgs args, DnsEndPoint endPoint)
   at System.Net.Sockets.Socket.ConnectAsync(SocketType socketType, ProtocolType protocolType, SocketAsyncEventArgs e)
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at HealthChecks.UI.Core.HostedService.HealthCheckReportCollector.GetHealthReport(HealthCheckConfiguration configuration)
2020-02-07 10:37:32.3037|ERROR|HealthChecks.UI.Core.HostedService.HealthCheckReportCollector|GetHealthReport threw an exception when trying to get report from /health configured with name TransactionServer.|System.Net.Http.HttpRequestException: IPv4 address 0.0.0.0 and IPv6 address ::0 are unspecified addresses that cannot be used as a target address. (Parameter 'hostName')
 ---> System.ArgumentException: IPv4 address 0.0.0.0 and IPv6 address ::0 are unspecified addresses that cannot be used as a target address. (Parameter 'hostName')
   at System.Net.Dns.HostResolutionBeginHelper(String hostName, Boolean justReturnParsedIp, Boolean throwOnIIPAny, AsyncCallback requestCallback, Object state)
   at System.Net.Dns.BeginGetHostAddresses(String hostNameOrAddress, AsyncCallback requestCallback, Object state)
   at System.Net.Sockets.MultipleConnectAsync.StartConnectAsync(SocketAsyncEventArgs args, DnsEndPoint endPoint)
   at System.Net.Sockets.Socket.ConnectAsync(SocketType socketType, ProtocolType protocolType, SocketAsyncEventArgs e)
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at HealthChecks.UI.Core.HostedService.HealthCheckReportCollector.GetHealthReport(HealthCheckConfiguration configuration)    at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.Extensions.Http.Logging.LoggingScopeHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at HealthChecks.UI.Core.HostedService.HealthCheckReportCollector.GetHealthReport(HealthCheckConfiguration configuration)