Support ASPNETCORE_URLS to set server urls

- Read both urls and server.urls in WebHost
- UseUrls now sets urls instead of server.urls

src/Microsoft.AspNetCore.Hosting.Abstractions/WebHostDefaults.cs

@@ -12,7 +12,7 @@ namespace Microsoft.AspNetCore.Hosting
         public static readonly string EnvironmentKey = "environment";
         public static readonly string WebRootKey = "webroot";
         public static readonly string CaptureStartupErrorsKey = "captureStartupErrors";
-        public static readonly string ServerUrlsKey = "server.urls";
+        public static readonly string ServerUrlsKey = "urls";
         public static readonly string ContentRootKey = "contentRoot";
     }
 }

src/Microsoft.AspNetCore.Hosting/Internal/WebHost.cs

@@ -20,6 +20,8 @@ namespace Microsoft.AspNetCore.Hosting.Internal
 {
     public class WebHost : IWebHost
     {
+        private static readonly string DeprecatedServerUrlsKey = "server.urls";
+
         private readonly IServiceCollection _applicationServiceCollection;
         private IStartup _startup;
 
@@ -188,7 +190,7 @@ namespace Microsoft.AspNetCore.Hosting.Internal
                 var addresses = Server.Features?.Get<IServerAddressesFeature>()?.Addresses;
                 if (addresses != null && !addresses.IsReadOnly && addresses.Count == 0)
                 {
-                    var urls = _config[WebHostDefaults.ServerUrlsKey];
+                    var urls = _config[WebHostDefaults.ServerUrlsKey] ?? _config[DeprecatedServerUrlsKey];
                     if (!string.IsNullOrEmpty(urls))
                     {
                         foreach (var value in urls.Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries))

src/Microsoft.AspNetCore.Hosting/WebHostBuilder.cs

@@ -9,7 +9,6 @@ using System.Reflection;
 using System.Runtime.ExceptionServices;
 using Microsoft.AspNetCore.Hosting.Builder;
 using Microsoft.AspNetCore.Hosting.Internal;
-using Microsoft.AspNetCore.Hosting.Server;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
@@ -47,14 +46,8 @@ namespace Microsoft.AspNetCore.Hosting
                 ?? Environment.GetEnvironmentVariable("Hosting:Environment")
                 ?? Environment.GetEnvironmentVariable("ASPNET_ENV"));
 
-            if (Environment.GetEnvironmentVariable("Hosting:Environment") != null)
+            // Add the default server.urls key
-            {
+            UseSetting(WebHostDefaults.ServerUrlsKey, Environment.GetEnvironmentVariable("ASPNETCORE_URLS"));
-                Console.WriteLine("The environment variable 'Hosting:Environment' is obsolete and has been replaced with 'ASPNETCORE_ENVIRONMENT'");
-            }
-            if (Environment.GetEnvironmentVariable("ASPNET_ENV") != null)
-            {
-                Console.WriteLine("The environment variable 'ASPNET_ENV' is obsolete and has been replaced with 'ASPNETCORE_ENVIRONMENT'");
-            }
         }
 
         /// <summary>
@@ -133,6 +126,17 @@ namespace Microsoft.AspNetCore.Hosting
         /// </summary>
         public IWebHost Build()
         {
+            // Warn about deprecated environment variables
+            if (Environment.GetEnvironmentVariable("Hosting:Environment") != null)
+            {
+                Console.WriteLine("The environment variable 'Hosting:Environment' is obsolete and has been replaced with 'ASPNETCORE_ENVIRONMENT'");
+            }
+
+            if (Environment.GetEnvironmentVariable("ASPNET_ENV") != null)
+            {
+                Console.WriteLine("The environment variable 'ASPNET_ENV' is obsolete and has been replaced with 'ASPNETCORE_ENVIRONMENT'");
+            }
+
             var hostingServices = BuildHostingServices();
             var hostingContainer = hostingServices.BuildServiceProvider();
 
@@ -192,7 +196,7 @@ namespace Microsoft.AspNetCore.Hosting
                 try
                 {
                     var startupType = StartupLoader.FindStartupType(_options.StartupAssembly, _hostingEnvironment.EnvironmentName);
-                    
+
                     if (typeof(IStartup).GetTypeInfo().IsAssignableFrom(startupType.GetTypeInfo()))
                     {
                         services.AddSingleton(typeof(IStartup), startupType);

test/Microsoft.AspNetCore.Hosting.Tests/WebHostTests.cs

@@ -75,6 +75,52 @@ namespace Microsoft.AspNetCore.Hosting
             Assert.Equal("http://localhost:5000", host.ServerFeatures.Get<IServerAddressesFeature>().Addresses.First());
         }
 
+        [Fact]
+        public void UsesLegacyConfigurationForAddresses()
+        {
+            var data = new Dictionary<string, string>
+            {
+                { "server.urls", "http://localhost:5002" }
+            };
+
+            var config = new ConfigurationBuilder().AddInMemoryCollection(data).Build();
+
+            var host = CreateBuilder(config).UseServer(this).Build();
+            host.Start();
+            Assert.Equal("http://localhost:5002", host.ServerFeatures.Get<IServerAddressesFeature>().Addresses.First());
+        }
+
+        [Fact]
+        public void UsesConfigurationForAddresses()
+        {
+            var data = new Dictionary<string, string>
+            {
+                { "urls", "http://localhost:5003" }
+            };
+
+            var config = new ConfigurationBuilder().AddInMemoryCollection(data).Build();
+
+            var host = CreateBuilder(config).UseServer(this).Build();
+            host.Start();
+            Assert.Equal("http://localhost:5003", host.ServerFeatures.Get<IServerAddressesFeature>().Addresses.First());
+        }
+
+        [Fact]
+        public void UsesNewConfigurationOverLegacyConfigForAddresses()
+        {
+            var data = new Dictionary<string, string>
+            {
+                { "server.urls", "http://localhost:5003" },
+                { "urls", "http://localhost:5009" }
+            };
+
+            var config = new ConfigurationBuilder().AddInMemoryCollection(data).Build();
+
+            var host = CreateBuilder(config).UseServer(this).Build();
+            host.Start();
+            Assert.Equal("http://localhost:5009", host.ServerFeatures.Get<IServerAddressesFeature>().Addresses.First());
+        }
+
         [Fact]
         public void WebHostCanBeStarted()
         {