Add IServerVariablesFeature

Enables fetching variables directly from IIS when using in-process
hosting. This is not available for out-of-process hosting.

Other changes:
 - Update tests to only run if IIS Express has been updated to support
 the new schema for hostingModel
 - Add a simpler test fixture for in-proc testing

.appveyor.yml

@@ -6,6 +6,8 @@ branches:
     - release
     - dev
     - /^(.*\/)?ci-.*$/
+install:
+  - ps: .\tools\update_schema.ps1
 build_script:
   - ps: .\run.ps1 default-build
 clone_depth: 1
@@ -15,4 +17,4 @@ environment:
     DOTNET_CLI_TELEMETRY_OPTOUT: 1
 test: off
 deploy: off
-os: Visual Studio 2017
+os: Visual Studio 2017

IISIntegration.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
-VisualStudioVersion = 15.0.27130.2020
+VisualStudioVersion = 15.0.27130.2026
 MinimumVisualStudioVersion = 15.0.26730.03
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{04B1EDB6-E967-4D25-89B9-E6F8304038CD}"
 	ProjectSection(SolutionItems) = preProject

samples/NativeIISSample/NativeIISSample.csproj

@@ -9,13 +9,13 @@
 
   <ItemGroup Condition="'$(OS)' == 'Windows_NT'">
     <!-- x86 -->
-    <None Include="..\..\src\RequestHandler\bin\$(Configuration)\Win32\aspnetcorerh.dll" CopyToOutputDirectory="PreserveNewest" Visible="false" Link="x86\aspnetcorerh.dll" />
-    <None Include="..\..\src\AspNetCore\bin\$(Configuration)\Win32\aspnetcore.dll" CopyToOutputDirectory="PreserveNewest" Visible="false" Link="x86\aspnetcore.dll" />
+    <None Include="..\..\src\RequestHandler\bin\$(Configuration)\Win32\*.*" CopyToOutputDirectory="PreserveNewest" Visible="false" Link="x86\%(FileName)%(Extension)" />
+    <None Include="..\..\src\AspNetCore\bin\$(Configuration)\Win32\*.*" CopyToOutputDirectory="PreserveNewest" Visible="false" Link="x86\%(FileName)%(Extension)" />
     <!-- x64 -->
-    <None Include="..\..\src\RequestHandler\bin\$(Configuration)\x64\aspnetcorerh.dll" CopyToOutputDirectory="PreserveNewest" Visible="false" Link="x64\aspnetcorerh.dll" />
-    <None Include="..\..\src\AspNetCore\bin\$(Configuration)\x64\aspnetcore.dll" CopyToOutputDirectory="PreserveNewest" Visible="false" Link="x64\aspnetcore.dll" />
+    <None Include="..\..\src\RequestHandler\bin\$(Configuration)\x64\*.*" CopyToOutputDirectory="PreserveNewest" Visible="false" Link="x64\%(FileName)%(Extension)" />
+    <None Include="..\..\src\AspNetCore\bin\$(Configuration)\x64\*.*" CopyToOutputDirectory="PreserveNewest" Visible="false" Link="x64\%(FileName)%(Extension)" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="$(MicrosoftAspNetCoreHostingPackageVersion)" />
   </ItemGroup>

samples/NativeIISSample/Startup.cs

@@ -7,19 +7,20 @@ using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Server.IIS;
 using Microsoft.AspNetCore.Server.IISIntegration;
 
 namespace NativeIISSample
 {
     public class Startup
     {
-
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
         public void Configure(IApplicationBuilder app, IHostingEnvironment env, IAuthenticationSchemeProvider authSchemeProvider)
         {
             app.Run(async (context) =>
             {
                 context.Response.ContentType = "text/plain";
+
                 await context.Response.WriteAsync("Hello World - " + DateTimeOffset.Now + Environment.NewLine);
                 await context.Response.WriteAsync(Environment.NewLine);
 
@@ -60,9 +61,29 @@ namespace NativeIISSample
                     await context.Response.WriteAsync(key + ": " + value + Environment.NewLine);
                 }
                 await context.Response.WriteAsync(Environment.NewLine);
+
+                // accessing IIS server variables
+                await context.Response.WriteAsync("Server Variables:" + Environment.NewLine);
+
+                foreach (var varName in IISServerVarNames)
+                {
+                    await context.Response.WriteAsync(varName + ": " + context.GetIISServerVariable(varName) + Environment.NewLine);
+                }
             });
         }
 
+        private static readonly string[] IISServerVarNames =
+        {
+            "AUTH_TYPE",
+            "AUTH_USER",
+            "CONTENT_TYPE",
+            "HTTP_HOST",
+            "HTTPS",
+            "REMOTE_PORT",
+            "REMOTE_USER",
+            "REQUEST_METHOD",
+        };
+
         public static void Main(string[] args)
         {
             var host = new WebHostBuilder()

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

@@ -0,0 +1,38 @@
+// 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.
+
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.Features;
+
+namespace Microsoft.AspNetCore.Server.IIS
+{
+    /// <summary>
+    /// Extensions to <see cref="HttpContext"/> that enable access to IIS features.
+    /// </summary>
+    public static class IISHttpContextExtensions
+    {
+        /// <summary>
+        /// Gets the value of a server variable for the current request.
+        /// </summary>
+        /// <param name="context">The http context for the request.</param>
+        /// <param name="variableName">The name of the variable.</param>
+        /// <returns>
+        /// <c>null</c> if the feature does not support the <see cref="IServerVariablesFeature"/> feature.
+        /// May return null or empty if the variable does not exist or is not set.
+        /// </returns>
+        /// <remarks>
+        /// For a list of common server variables available in IIS, see http://go.microsoft.com/fwlink/?LinkId=52471.
+        /// </remarks>
+        public static string GetIISServerVariable(this HttpContext context, string variableName)
+        {
+            var feature = context.Features.Get<IServerVariablesFeature>();
+
+            if (feature == null)
+            {
+                return null;
+            }
+
+            return feature[variableName];
+        }
+    }
+}

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

@@ -0,0 +1,24 @@
+// 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.AspNetCore.Http.Features
+{
+    /// <summary>
+    /// This feature provides access to request server variables set.
+    /// <para>
+    /// This feature is only available when hosting ASP.NET Core in-process with IIS or IIS Express.
+    /// </para>
+    /// </summary>
+    /// <remarks>
+    /// For a list of common server variables available in IIS, see http://go.microsoft.com/fwlink/?LinkId=52471.
+    /// </remarks>
+    public interface IServerVariablesFeature
+    {
+        /// <summary>
+        /// Gets the value of a server variable for the current request.
+        /// </summary>
+        /// <param name="variableName">The variable name</param>
+        /// <returns>May return null or empty if the variable does not exist or is not set.</returns>
+        string this[string variableName] { get; }
+    }
+}

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

@@ -77,6 +77,9 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
         [DllImport(AspNetCoreModuleDll)]
         public unsafe static extern int http_get_application_properties(ref IISConfigurationData iiConfigData);
 
+        [DllImport(AspNetCoreModuleDll)]
+        public static extern int http_get_server_variable(IntPtr pInProcessHandler, [MarshalAs(UnmanagedType.AnsiBStr)] string variableName, [MarshalAs(UnmanagedType.BStr)] out string value);
+
         [DllImport(AspNetCoreModuleDll)]
         public unsafe static extern bool http_shutdown();
 

src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpContext.FeatureCollection.cs

@@ -25,7 +25,8 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
                                             IHttpConnectionFeature,
                                             IHttpRequestLifetimeFeature,
                                             IHttpRequestIdentifierFeature,
-                                            IHttpAuthenticationFeature
+                                            IHttpAuthenticationFeature,
+                                            IServerVariablesFeature
     {
         // NOTE: When feature interfaces are added to or removed from this HttpProtocol implementation,
         // then the list of `implementedFeatures` in the generated code project MUST also be updated.
@@ -234,6 +235,20 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
 
         public IAuthenticationHandler Handler { get; set; }
 
+        string IServerVariablesFeature.this[string variableName]
+        {
+            get
+            {
+                if (string.IsNullOrEmpty(variableName))
+                {
+                    return null;
+                }
+
+                int hr = NativeMethods.http_get_server_variable(_pInProcessHandler, variableName, out var value);
+                return hr == 0 ? value : null;
+            }
+        }
+
         object IFeatureCollection.this[Type key]
         {
             get => FastFeatureGet(key);

src/Microsoft.AspNetCore.Server.IISIntegration/Server/IISHttpContext.Features.cs

@@ -3,8 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 
 namespace Microsoft.AspNetCore.Server.IISIntegration
 {
@@ -28,6 +26,7 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
         private static readonly Type IHttpBodyControlFeatureType = typeof(global::Microsoft.AspNetCore.Http.Features.IHttpBodyControlFeature);
         private static readonly Type IHttpSendFileFeatureType = typeof(global::Microsoft.AspNetCore.Http.Features.IHttpSendFileFeature);
         private static readonly Type IISHttpContextType = typeof(IISHttpContext);
+        private static readonly Type IServerVariablesFeature = typeof(global::Microsoft.AspNetCore.Http.Features.IServerVariablesFeature);
 
         private object _currentIHttpRequestFeature;
         private object _currentIHttpResponseFeature;
@@ -49,6 +48,7 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
         private object _currentISessionFeature;
         private object _currentIHttpBodyControlFeature;
         private object _currentIHttpSendFileFeature;
+        private object _currentIServerVariablesFeature;
 
         private void Initialize()
         {
@@ -63,6 +63,7 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
             _currentIHttpMinResponseDataRateFeature = this;
             _currentIHttpBodyControlFeature = this;
             _currentIHttpAuthenticationFeature = this;
+            _currentIServerVariablesFeature = this;
         }
 
         internal object FastFeatureGet(Type key)
@@ -139,6 +140,10 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
             {
                 return this;
             }
+            if (key == IServerVariablesFeature)
+            {
+                return this;
+            }
 
             return ExtraFeatureGet(key);
         }
@@ -232,6 +237,11 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
                 _currentIHttpSendFileFeature = feature;
                 return;
             }
+            if (key == IServerVariablesFeature)
+            {
+                _currentIServerVariablesFeature = feature;
+                return;
+            }
             if (key == IISHttpContextType)
             {
                 throw new InvalidOperationException("Cannot set IISHttpContext in feature collection");
@@ -309,6 +319,10 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
             {
                 yield return new KeyValuePair<Type, object>(IHttpSendFileFeatureType, _currentIHttpSendFileFeature as global::Microsoft.AspNetCore.Http.Features.IHttpSendFileFeature);
             }
+            if (_currentIServerVariablesFeature != null)
+            {
+                yield return new KeyValuePair<Type, object>(IServerVariablesFeature, _currentIServerVariablesFeature as global::Microsoft.AspNetCore.Http.Features.IServerVariablesFeature);
+            }
 
             if (MaybeExtra != null)
             {

src/RequestHandler/managedexports.cxx

@@ -43,6 +43,37 @@ http_get_raw_response(
     return pInProcessHandler->QueryHttpContext()->GetResponse()->GetRawHttpResponse();
 }
 
+EXTERN_C __MIDL_DECLSPEC_DLLEXPORT
+HRESULT
+http_get_server_variable(
+    _In_ IN_PROCESS_HANDLER* pInProcessHandler,
+    _In_ PCSTR pszVariableName,
+    _Out_ BSTR* pwszReturn
+)
+{
+    PCWSTR pszVariableValue;
+    DWORD cbLength;
+    HRESULT hr = pInProcessHandler
+        ->QueryHttpContext()
+        ->GetServerVariable(pszVariableName, &pszVariableValue, &cbLength);
+
+    if (FAILED(hr) || cbLength == 0)
+    {
+        goto Finished;
+    }
+
+    *pwszReturn = SysAllocString(pszVariableValue);
+
+    if (*pwszReturn == NULL)
+    {
+        hr = E_OUTOFMEMORY;
+        goto Finished;
+    }
+
+Finished:
+    return hr;
+}
+
 EXTERN_C __MIDL_DECLSPEC_DLLEXPORT VOID http_set_response_status_code(
     _In_ IN_PROCESS_HANDLER* pInProcessHandler,
     _In_ USHORT statusCode,
@@ -392,4 +423,4 @@ http_get_authentication_information(
     return S_OK;
 }
 
-// End of export
+// End of export

test/IISIntegration.IISServerFunctionalTests/AuthenticationTests.cs

@@ -4,14 +4,13 @@
 #if NET461
 
 using System;
-using System.Collections.Generic;
 using System.IO;
 using System.Net;
 using System.Net.Http;
-using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.IIS.FunctionalTests;
 using Microsoft.AspNetCore.Server.IntegrationTesting;
+using Microsoft.AspNetCore.Testing.xunit;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Testing;
 using Xunit;
@@ -26,7 +25,7 @@ namespace IISIntegration.IISServerFunctionalTests
         {
         }
 
-        [Fact(Skip = "See https://github.com/aspnet/IISIntegration/issues/424")]
+        [ConditionalFact]
         public Task Authentication_InProcess_IISExpress()
         {
             return Authentication();

test/IISIntegration.IISServerFunctionalTests/FeatureCollectionTests.cs

@@ -8,6 +8,7 @@ using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.IIS.FunctionalTests;
 using Microsoft.AspNetCore.Server.IntegrationTesting;
+using Microsoft.AspNetCore.Testing.xunit;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Testing;
 using Xunit;
@@ -22,7 +23,7 @@ namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
         {
         }
 
-        [Theory(Skip = "See https://github.com/aspnet/IISIntegration/issues/424")]
+        [ConditionalTheory]
         [InlineData("SetRequestFeatures")]
         [InlineData("SetResponseFeatures")]
         [InlineData("SetConnectionFeatures")]

test/IISIntegration.IISServerFunctionalTests/HelloWorldTests.cs

@@ -2,11 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Collections.Generic;
 using System.IO;
-using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.IntegrationTesting;
+using Microsoft.AspNetCore.Testing.xunit;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Testing;
 using Xunit;
@@ -21,7 +20,7 @@ namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
         {
         }
 
-        [Fact(Skip = "See https://github.com/aspnet/IISIntegration/issues/515")]
+        [ConditionalFact]
         public Task HelloWorld_InProcess_IISExpress_CoreClr_X64_Portable()
         {
             return HelloWorld(RuntimeFlavor.CoreClr, ApplicationType.Portable);

test/IISIntegration.IISServerFunctionalTests/IISIntegration.IISServerFunctionalTests.csproj

@@ -2,6 +2,8 @@
 
   <PropertyGroup>
     <TargetFrameworks>$(StandardTestTfms)</TargetFrameworks>
+    <RootNamespace>Microsoft.AspNetCore.Server.IIS.FunctionalTests</RootNamespace>
+    <AssemblyName>Microsoft.AspNetCore.Server.IIS.FunctionalTests</AssemblyName>
   </PropertyGroup>
   
   <ItemGroup>

test/IISIntegration.IISServerFunctionalTests/LargeResponseBodyTests.cs

@@ -2,12 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Collections.Generic;
 using System.IO;
-using System.Text;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Server.IIS.FunctionalTests;
 using Microsoft.AspNetCore.Server.IntegrationTesting;
+using Microsoft.AspNetCore.Testing.xunit;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Testing;
 using Xunit;
@@ -23,7 +21,7 @@ namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
         {
         }
 
-        [Theory(Skip = "See https://github.com/aspnet/IISIntegration/issues/424")]
+        [ConditionalTheory]
         [InlineData(10000)]
         [InlineData(100000)]
         [InlineData(1000000)]
@@ -84,7 +82,7 @@ namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
         }
 
 
-        [Fact (Skip = "See https://github.com/aspnet/IISIntegration/issues/424")]
+        [ConditionalFact]
         public Task LargeFileResponseBodyInternalCheck()
         {
             return LargeResponseBodyFromFile(RuntimeFlavor.CoreClr, ApplicationType.Portable);
@@ -106,7 +104,12 @@ namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
                     SiteName = "HttpTestSite", // This is configured in the Http.config
                     TargetFramework = runtimeFlavor == RuntimeFlavor.Clr ? "net461" : "netcoreapp2.0",
                     ApplicationType = applicationType,
-
+                    Configuration =
+#if DEBUG
+                        "Debug"
+#else
+                        "Release"
+#endif
                 };
 
                 using (var deployer = ApplicationDeployerFactory.Create(deploymentParameters, loggerFactory))

test/IISIntegration.IISServerFunctionalTests/Properties/AssemblyInfo.cs

@@ -0,0 +1,5 @@
+// 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.
+
+// All functional tests in this project require a version of IIS express with an updated schema
+[assembly: Microsoft.AspNetCore.Server.IIS.FunctionalTests.IISExpressSupportsInProcessHosting]

test/IISIntegration.IISServerFunctionalTests/ResponseHeaderTests.cs

@@ -2,13 +2,12 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Net;
-using System.Text;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.IntegrationTesting;
+using Microsoft.AspNetCore.Testing.xunit;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Testing;
 using Microsoft.Net.Http.Headers;
@@ -24,7 +23,7 @@ namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
         {
         }
 
-        [Fact(Skip = "See https://github.com/aspnet/IISIntegration/issues/424")]
+        [ConditionalFact]
         public Task AddResponseHeaders_HeaderValuesAreSetCorrectly()
         {
             return RunResponseHeaders(ApplicationType.Portable);

test/IISIntegration.IISServerFunctionalTests/ResponseInvalidOrderingTests.cs

@@ -5,6 +5,7 @@ using System;
 using System.IO;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Server.IntegrationTesting;
+using Microsoft.AspNetCore.Testing.xunit;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Testing;
 using Xunit;
@@ -19,7 +20,7 @@ namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
         {
         }
 
-        [Theory(Skip = "See https://github.com/aspnet/IISIntegration/issues/424")]
+        [ConditionalTheory]
         [InlineData("SetStatusCodeAfterWrite")]
         [InlineData("SetHeaderAfterWrite")]
         public Task ResponseInvalidOrderingTests_ExpectFailure(string path)

test/IISIntegration.IISServerFunctionalTests/ServerVariablesTest.cs

@@ -0,0 +1,35 @@
+// 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.
+
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Testing.xunit;
+using Xunit;
+
+namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
+{
+    [Collection(IISTestSiteCollection.Name)]
+    public class ServerVariablesTest
+    {
+        private readonly IISTestSiteFixture _fixture;
+
+        public ServerVariablesTest(IISTestSiteFixture fixture)
+        {
+            _fixture = fixture;
+        }
+
+        [ConditionalFact]
+        public async Task ProvidesAccessToServerVariables()
+        {
+            var port = _fixture.Client.BaseAddress.Port;
+            Assert.Equal("SERVER_PORT: " + port, await _fixture.Client.GetStringAsync("/ServerVariable?q=SERVER_PORT"));
+            Assert.Equal("QUERY_STRING: q=QUERY_STRING", await _fixture.Client.GetStringAsync("/ServerVariable?q=QUERY_STRING"));
+        }
+
+        [ConditionalFact]
+        public async Task ReturnsNullForUndefinedServerVariable()
+        {
+            var port = _fixture.Client.BaseAddress.Port;
+            Assert.Equal("THIS_VAR_IS_UNDEFINED: (null)", await _fixture.Client.GetStringAsync("/ServerVariable?q=THIS_VAR_IS_UNDEFINED"));
+        }
+    }
+}

test/IISIntegration.IISServerFunctionalTests/Utilities/IISExpressSupportsInProcessHostingAttribute.cs

@@ -0,0 +1,62 @@
+// 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.
+
+using System;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Xml.Linq;
+using Microsoft.AspNetCore.Testing.xunit;
+
+namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
+{
+    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Assembly | AttributeTargets.Class)]
+    public sealed class IISExpressSupportsInProcessHostingAttribute : Attribute, ITestCondition
+    {
+        public bool IsMet => AncmSchema.SupportsInProcessHosting;
+
+        public string SkipReason => AncmSchema.SkipReason;
+
+        private class AncmSchema
+        {
+            public static bool SupportsInProcessHosting { get; }
+            public static string SkipReason { get; } = "IIS Express must be upgraded to support in-process hosting.";
+
+            static AncmSchema()
+            {
+                if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                {
+                    SkipReason = "IIS Express tests can only be run on Windows";
+                    return;
+                }
+
+                var ancmConfigPath = Path.Combine(
+                    Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles),
+                    "IIS Express", "config", "schema", "aspnetcore_schema.xml");
+
+                if (!File.Exists(ancmConfigPath))
+                {
+                    SkipReason = "IIS Express is not installed.";
+                    return;
+                }
+
+                XDocument ancmConfig;
+
+                try
+                {
+                    ancmConfig = XDocument.Load(ancmConfigPath);
+                }
+                catch
+                {
+                    SkipReason = "Could not read ANCM schema configuration";
+                    return;
+                }
+
+                SupportsInProcessHosting = ancmConfig
+                    .Root
+                    .Descendants("attribute")
+                    .Any(n => "hostingModel".Equals(n.Attribute("name")?.Value, StringComparison.Ordinal));
+            }
+        }
+    }
+}

test/IISIntegration.IISServerFunctionalTests/Utilities/IISTestSiteCollection.cs

@@ -0,0 +1,16 @@
+// 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.
+
+using Xunit;
+
+namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
+{
+    /// <summary>
+    /// This type just maps collection names to available fixtures
+    /// </summary>
+    [CollectionDefinition(Name)]
+    public class IISTestSiteCollection : ICollectionFixture<IISTestSiteFixture>
+    {
+        public const string Name = nameof(IISTestSiteCollection);
+    }
+}

test/IISIntegration.IISServerFunctionalTests/Utilities/IISTestSiteFixture.cs

@@ -0,0 +1,52 @@
+// 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.
+
+using System;
+using System.IO;
+using System.Net.Http;
+using System.Threading;
+using Microsoft.AspNetCore.Server.IntegrationTesting;
+using Microsoft.Extensions.Logging.Abstractions;
+
+namespace Microsoft.AspNetCore.Server.IIS.FunctionalTests
+{
+    public class IISTestSiteFixture : IDisposable
+    {
+        private readonly IApplicationDeployer _deployer;
+
+        public IISTestSiteFixture()
+        {
+            var deploymentParameters = new DeploymentParameters(Helpers.GetTestSitesPath(),
+                ServerType.IISExpress,
+                RuntimeFlavor.CoreClr,
+                RuntimeArchitecture.x64)
+            {
+                ServerConfigTemplateContent = File.ReadAllText("Http.config"),
+                SiteName = "HttpTestSite",
+                TargetFramework = "netcoreapp2.0",
+                ApplicationType = ApplicationType.Portable,
+                Configuration =
+#if DEBUG
+                        "Debug"
+#else
+                        "Release"
+#endif
+            };
+
+            _deployer = ApplicationDeployerFactory.Create(deploymentParameters, NullLoggerFactory.Instance);
+            var deploymentResult = _deployer.DeployAsync().Result;
+            Client = deploymentResult.HttpClient;
+            BaseUri = deploymentResult.ApplicationBaseUri;
+            ShutdownToken = deploymentResult.HostShutdownToken;
+        }
+
+        public string BaseUri { get; }
+        public HttpClient Client { get; }
+        public CancellationToken ShutdownToken { get; }
+
+        public void Dispose()
+        {
+            _deployer.Dispose();
+        }
+    }
+}

test/IISTestSite/Startup.cs

@@ -0,0 +1,26 @@
+// 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.
+
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Server.IIS;
+
+namespace IISTestSite
+{
+    public class Startup
+    {
+        public void Configure(IApplicationBuilder app)
+        {
+            app.Map("/ServerVariable", ServerVariable);
+        }
+
+        private void ServerVariable(IApplicationBuilder app)
+        {
+            app.Run(async ctx =>
+            {
+                var varName = ctx.Request.Query["q"];
+                await ctx.Response.WriteAsync($"{varName}: {ctx.GetIISServerVariable(varName) ?? "(null)"}");
+            });
+        }
+    }
+}

tools/update_schema.ps1

@@ -0,0 +1,55 @@
+<#
+.DESCRIPTION
+Updates aspnetcore_schema.xml to the latest version.
+Requires admin privileges.
+#>
+[cmdletbinding(SupportsShouldProcess = $true)]
+param()
+
+$ErrorActionPreference = 'Stop'
+Set-StrictMode -Version 1
+
+$schemaSource = Resolve-Path "$PSScriptRoot\..\src\AspNetCore\aspnetcore_schema.xml"
+[bool]$isAdmin = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")
+
+if (-not $isAdmin -and -not $WhatIfPreference) {
+    if ($PSCmdlet.ShouldContinue("Continue as an admin?", "This script needs admin privileges to update IIS Express and IIS.")) {
+        $thisFile = Join-Path $PSScriptRoot $MyInvocation.MyCommand.Name
+
+        Start-Process `
+            -Verb runas `
+            -FilePath "powershell.exe" `
+            -ArgumentList $thisFile `
+            -Wait `
+            | Out-Null
+
+        if (-not $?) {
+            throw 'Update failed'
+        }
+        exit
+    }
+    else {
+        throw 'Requires admin privileges'
+    }
+}
+
+$destinations = @(
+    "${env:ProgramFiles(x86)}\IIS Express\config\schema\aspnetcore_schema.xml",
+    "${env:ProgramFiles}\IIS Express\config\schema\aspnetcore_schema.xml",
+    "${env:windir}\system32\inetsrv\config\schema\aspnetcore_schema.xml"
+) | Get-Unique
+
+
+foreach ($dest in $destinations) {
+    if (-not (Test-Path $dest)) {
+        Write-Host -ForegroundColor Yellow "Skipping $dest. File does not already exist."
+        continue
+    }
+
+    if ($PSCmdlet.ShouldProcess($dest, "Replace file")) {
+        Write-Host "Updated $dest"
+        Move-Item $dest "${dest}.bak" -ErrorAction Ignore
+        Copy-Item $schemaSource $dest
+    }
+}
+