diff --git a/src/Microsoft.AspNet.Hosting.Abstractions/WebApplicationDefaults.cs b/src/Microsoft.AspNet.Hosting.Abstractions/WebApplicationDefaults.cs
new file mode 100644
index 0000000000..3efa2561ad
--- /dev/null
+++ b/src/Microsoft.AspNet.Hosting.Abstractions/WebApplicationDefaults.cs
@@ -0,0 +1,20 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+namespace Microsoft.AspNet.Hosting
+{
+    public static class WebApplicationDefaults
+    {
+        public static readonly string ApplicationKey = "application";
+        public static readonly string DetailedErrorsKey = "detailedErrors";
+        public static readonly string EnvironmentKey = "environment";
+        public static readonly string ServerKey = "server";
+        public static readonly string WebRootKey = "webroot";
+        public static readonly string CaptureStartupErrorsKey = "captureStartupErrors";
+        public static readonly string ServerUrlsKey = "server.urls";
+        public static readonly string ApplicationBaseKey = "applicationBase";
+
+        public static readonly string HostingJsonFile = "hosting.json";
+        public static readonly string EnvironmentVariablesPrefix = "ASPNET_";
+    }
+}
diff --git a/src/Microsoft.AspNet.Hosting/Internal/WebApplicationOptions.cs b/src/Microsoft.AspNet.Hosting/Internal/WebApplicationOptions.cs
index 1019c866ec..dd4ef59750 100644
--- a/src/Microsoft.AspNet.Hosting/Internal/WebApplicationOptions.cs
+++ b/src/Microsoft.AspNet.Hosting/Internal/WebApplicationOptions.cs
@@ -21,13 +21,13 @@ namespace Microsoft.AspNet.Hosting.Internal
                 throw new ArgumentNullException(nameof(configuration));
             }
 
-            Application = configuration[WebApplicationConfiguration.ApplicationKey];
-            DetailedErrors = ParseBool(configuration, WebApplicationConfiguration.DetailedErrorsKey);
-            CaptureStartupErrors = ParseBool(configuration, WebApplicationConfiguration.CaptureStartupErrorsKey);
-            Environment = configuration[WebApplicationConfiguration.EnvironmentKey] ?? configuration[OldEnvironmentKey];
-            ServerFactoryLocation = configuration[WebApplicationConfiguration.ServerKey];
-            WebRoot = configuration[WebApplicationConfiguration.WebRootKey];
-            ApplicationBasePath = configuration[WebApplicationConfiguration.ApplicationBaseKey];
+            Application = configuration[WebApplicationDefaults.ApplicationKey];
+            DetailedErrors = ParseBool(configuration, WebApplicationDefaults.DetailedErrorsKey);
+            CaptureStartupErrors = ParseBool(configuration, WebApplicationDefaults.CaptureStartupErrorsKey);
+            Environment = configuration[WebApplicationDefaults.EnvironmentKey] ?? configuration[OldEnvironmentKey];
+            ServerFactoryLocation = configuration[WebApplicationDefaults.ServerKey];
+            WebRoot = configuration[WebApplicationDefaults.WebRootKey];
+            ApplicationBasePath = configuration[WebApplicationDefaults.ApplicationBaseKey];
         }
 
         public string Application { get; set; }
diff --git a/src/Microsoft.AspNet.Hosting/WebApplicationBuilderExtensions.cs b/src/Microsoft.AspNet.Hosting/WebApplicationBuilderExtensions.cs
index e49ba7f4ed..555c087bd3 100644
--- a/src/Microsoft.AspNet.Hosting/WebApplicationBuilderExtensions.cs
+++ b/src/Microsoft.AspNet.Hosting/WebApplicationBuilderExtensions.cs
@@ -25,7 +25,7 @@ namespace Microsoft.AspNet.Hosting
                 throw new ArgumentNullException(nameof(assemblyName));
             }
 
-            return applicationBuilder.UseSetting(WebApplicationConfiguration.ServerKey, assemblyName);
+            return applicationBuilder.UseSetting(WebApplicationDefaults.ServerKey, assemblyName);
         }
 
         public static IWebApplicationBuilder UseServer(this IWebApplicationBuilder applicationBuilder, IServer server)
@@ -45,7 +45,7 @@ namespace Microsoft.AspNet.Hosting
                 throw new ArgumentNullException(nameof(applicationBasePath));
             }
 
-            return applicationBuilder.UseSetting(WebApplicationConfiguration.ApplicationBaseKey, applicationBasePath);
+            return applicationBuilder.UseSetting(WebApplicationDefaults.ApplicationBaseKey, applicationBasePath);
         }
 
         public static IWebApplicationBuilder UseEnvironment(this IWebApplicationBuilder applicationBuilder, string environment)
@@ -55,7 +55,7 @@ namespace Microsoft.AspNet.Hosting
                 throw new ArgumentNullException(nameof(environment));
             }
 
-            return applicationBuilder.UseSetting(WebApplicationConfiguration.EnvironmentKey, environment);
+            return applicationBuilder.UseSetting(WebApplicationDefaults.EnvironmentKey, environment);
         }
 
         public static IWebApplicationBuilder UseWebRoot(this IWebApplicationBuilder applicationBuilder, string webRoot)
@@ -65,7 +65,7 @@ namespace Microsoft.AspNet.Hosting
                 throw new ArgumentNullException(nameof(webRoot));
             }
 
-            return applicationBuilder.UseSetting(WebApplicationConfiguration.WebRootKey, webRoot);
+            return applicationBuilder.UseSetting(WebApplicationDefaults.WebRootKey, webRoot);
         }
 
         public static IWebApplicationBuilder UseUrls(this IWebApplicationBuilder applicationBuilder, params string[] urls)
@@ -75,7 +75,7 @@ namespace Microsoft.AspNet.Hosting
                 throw new ArgumentNullException(nameof(urls));
             }
 
-            return applicationBuilder.UseSetting(WebApplicationConfiguration.ServerUrlsKey, string.Join(ServerUrlsSeparator, urls));
+            return applicationBuilder.UseSetting(WebApplicationDefaults.ServerUrlsKey, string.Join(ServerUrlsSeparator, urls));
         }
 
         public static IWebApplicationBuilder UseStartup(this IWebApplicationBuilder applicationBuilder, string startupAssemblyName)
@@ -85,7 +85,7 @@ namespace Microsoft.AspNet.Hosting
                 throw new ArgumentNullException(nameof(startupAssemblyName));
             }
 
-            return applicationBuilder.UseSetting(WebApplicationConfiguration.ApplicationKey, startupAssemblyName);
+            return applicationBuilder.UseSetting(WebApplicationDefaults.ApplicationKey, startupAssemblyName);
         }
 
         public static IWebApplication Start(this IWebApplicationBuilder applicationBuilder, params string[] urls)
diff --git a/src/Microsoft.AspNet.Hosting/WebApplicationConfiguration.cs b/src/Microsoft.AspNet.Hosting/WebApplicationConfiguration.cs
index 49eff15003..3bc3013858 100644
--- a/src/Microsoft.AspNet.Hosting/WebApplicationConfiguration.cs
+++ b/src/Microsoft.AspNet.Hosting/WebApplicationConfiguration.cs
@@ -4,18 +4,6 @@ namespace Microsoft.AspNet.Hosting
 {
     public class WebApplicationConfiguration
     {
-        public static readonly string ApplicationKey = "application";
-        public static readonly string DetailedErrorsKey = "detailedErrors";
-        public static readonly string EnvironmentKey = "environment";
-        public static readonly string ServerKey = "server";
-        public static readonly string WebRootKey = "webroot";
-        public static readonly string CaptureStartupErrorsKey = "captureStartupErrors";
-        public static readonly string ServerUrlsKey = "server.urls";
-        public static readonly string ApplicationBaseKey = "applicationBase";
-
-        public static readonly string HostingJsonFile = "hosting.json";
-        public static readonly string EnvironmentVariablesPrefix = "ASPNET_";
-
         public static IConfiguration GetDefault()
         {
             return GetDefault(args: null);
@@ -26,9 +14,9 @@ namespace Microsoft.AspNet.Hosting
             // We are adding all environment variables first and then adding the ASPNET_ ones
             // with the prefix removed to unify with the command line and config file formats
             var configBuilder = new ConfigurationBuilder()
-                .AddJsonFile(HostingJsonFile, optional: true)
+                .AddJsonFile(WebApplicationDefaults.HostingJsonFile, optional: true)
                 .AddEnvironmentVariables()
-                .AddEnvironmentVariables(prefix: EnvironmentVariablesPrefix);
+                .AddEnvironmentVariables(prefix: WebApplicationDefaults.EnvironmentVariablesPrefix);
 
             if (args != null)
             {