Trailers for IIS

dotnet · Aug 4, 2020 · 26c0f3b · 26c0f3b
1 parent 1f5149a
commit 26c0f3b
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Showing 11 changed files with 669 additions and 10 deletions.
diff --git a/AspNetCore.sln b/AspNetCore.sln
@@ -1457,6 +1457,28 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "InteropWebsite", "src\Grpc\
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Wasm.Performance.ConsoleHost", "src\Components\benchmarkapps\Wasm.Performance\ConsoleHost\Wasm.Performance.ConsoleHost.csproj", "{E9408723-E6A9-4715-B906-3B25B0238ABA}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "InProcessWebSite", "src\Servers\IIS\IIS\test\testassets\InProcessWebSite\InProcessWebSite.csproj", "{8DA61885-B95E-4BA1-A752-C79B6597FC44}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ANCM", "ANCM", "{D62AF49B-F9FE-4794-AC39-A473FF13CA81}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "AspNetCore", "src\Servers\IIS\AspNetCoreModuleV2\AspNetCore\AspNetCore.vcxproj", "{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "CommonLib", "src\Servers\IIS\AspNetCoreModuleV2\CommonLib\CommonLib.vcxproj", "{55494E58-E061-4C4C-A0A8-837008E72F85}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "CommonLibTests", "src\Servers\IIS\AspNetCoreModuleV2\CommonLibTests\CommonLibTests.vcxproj", "{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "gtest", "src\Servers\IIS\AspNetCoreModuleV2\gtest\gtest.vcxproj", "{CAC1267B-8778-4257-AAC6-CAF481723B01}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "IISLib", "src\Servers\IIS\AspNetCoreModuleV2\IISLib\IISLib.vcxproj", "{09D9D1D6-2951-4E14-BC35-76A23CF9391A}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "InProcessRequestHandler", "src\Servers\IIS\AspNetCoreModuleV2\InProcessRequestHandler\InProcessRequestHandler.vcxproj", "{D57EA297-6DC2-4BC0-8C91-334863327863}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "OutOfProcessRequestHandler", "src\Servers\IIS\AspNetCoreModuleV2\OutOfProcessRequestHandler\OutOfProcessRequestHandler.vcxproj", "{7F87406C-A3C8-4139-A68D-E4C344294A67}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "RequestHandlerLib", "src\Servers\IIS\AspNetCoreModuleV2\RequestHandlerLib\RequestHandlerLib.vcxproj", "{1533E271-F61B-441B-8B74-59FB61DF0552}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.AspNetCore.ANCMSymbols", "src\Servers\IIS\AspNetCoreModuleV2\Symbols\Microsoft.AspNetCore.ANCMSymbols.csproj", "{7E268085-1046-4362-80CB-2977FF826DCA}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -6903,6 +6925,124 @@ Global
 		{E9408723-E6A9-4715-B906-3B25B0238ABA}.Release|x64.Build.0 = Release|Any CPU
 		{E9408723-E6A9-4715-B906-3B25B0238ABA}.Release|x86.ActiveCfg = Release|Any CPU
 		{E9408723-E6A9-4715-B906-3B25B0238ABA}.Release|x86.Build.0 = Release|Any CPU
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44}.Debug|Any CPU.ActiveCfg = Debug|x86
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44}.Debug|x64.ActiveCfg = Debug|x64
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44}.Debug|x64.Build.0 = Debug|x64
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44}.Debug|x86.ActiveCfg = Debug|x86
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44}.Debug|x86.Build.0 = Debug|x86
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44}.Release|Any CPU.ActiveCfg = Release|x86
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44}.Release|x64.ActiveCfg = Release|x64
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44}.Release|x64.Build.0 = Release|x64
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44}.Release|x86.ActiveCfg = Release|x86
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44}.Release|x86.Build.0 = Release|x86
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Debug|x64.ActiveCfg = Debug|x64
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Debug|x64.Build.0 = Debug|x64
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Debug|x86.ActiveCfg = Debug|Win32
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Debug|x86.Build.0 = Debug|Win32
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Debug|x86.Deploy.0 = Debug|Win32
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Release|Any CPU.ActiveCfg = Release|Win32
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Release|x64.ActiveCfg = Release|x64
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Release|x64.Build.0 = Release|x64
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Release|x86.ActiveCfg = Release|Win32
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Release|x86.Build.0 = Release|Win32
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B}.Release|x86.Deploy.0 = Release|Win32
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Debug|x64.ActiveCfg = Debug|x64
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Debug|x64.Build.0 = Debug|x64
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Debug|x86.ActiveCfg = Debug|Win32
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Debug|x86.Build.0 = Debug|Win32
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Debug|x86.Deploy.0 = Debug|Win32
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Release|Any CPU.ActiveCfg = Release|Win32
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Release|x64.ActiveCfg = Release|x64
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Release|x64.Build.0 = Release|x64
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Release|x86.ActiveCfg = Release|Win32
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Release|x86.Build.0 = Release|Win32
+		{55494E58-E061-4C4C-A0A8-837008E72F85}.Release|x86.Deploy.0 = Release|Win32
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Debug|x64.ActiveCfg = Debug|x64
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Debug|x64.Build.0 = Debug|x64
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Debug|x86.ActiveCfg = Debug|Win32
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Debug|x86.Build.0 = Debug|Win32
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Debug|x86.Deploy.0 = Debug|Win32
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Release|Any CPU.ActiveCfg = Release|Win32
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Release|x64.ActiveCfg = Release|x64
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Release|x64.Build.0 = Release|x64
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Release|x86.ActiveCfg = Release|Win32
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Release|x86.Build.0 = Release|Win32
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1}.Release|x86.Deploy.0 = Release|Win32
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Debug|x64.ActiveCfg = Debug|x64
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Debug|x64.Build.0 = Debug|x64
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Debug|x86.ActiveCfg = Debug|Win32
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Debug|x86.Build.0 = Debug|Win32
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Debug|x86.Deploy.0 = Debug|Win32
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Release|Any CPU.ActiveCfg = Release|Win32
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Release|x64.ActiveCfg = Release|x64
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Release|x64.Build.0 = Release|x64
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Release|x86.ActiveCfg = Release|Win32
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Release|x86.Build.0 = Release|Win32
+		{CAC1267B-8778-4257-AAC6-CAF481723B01}.Release|x86.Deploy.0 = Release|Win32
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Debug|x64.ActiveCfg = Debug|x64
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Debug|x64.Build.0 = Debug|x64
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Debug|x86.ActiveCfg = Debug|Win32
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Debug|x86.Build.0 = Debug|Win32
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Debug|x86.Deploy.0 = Debug|Win32
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Release|Any CPU.ActiveCfg = Release|Win32
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Release|x64.ActiveCfg = Release|x64
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Release|x64.Build.0 = Release|x64
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Release|x86.ActiveCfg = Release|Win32
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Release|x86.Build.0 = Release|Win32
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A}.Release|x86.Deploy.0 = Release|Win32
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Debug|x64.ActiveCfg = Debug|x64
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Debug|x64.Build.0 = Debug|x64
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Debug|x86.ActiveCfg = Debug|Win32
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Debug|x86.Build.0 = Debug|Win32
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Debug|x86.Deploy.0 = Debug|Win32
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Release|Any CPU.ActiveCfg = Release|Win32
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Release|x64.ActiveCfg = Release|x64
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Release|x64.Build.0 = Release|x64
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Release|x86.ActiveCfg = Release|Win32
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Release|x86.Build.0 = Release|Win32
+		{D57EA297-6DC2-4BC0-8C91-334863327863}.Release|x86.Deploy.0 = Release|Win32
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Debug|x64.ActiveCfg = Debug|x64
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Debug|x64.Build.0 = Debug|x64
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Debug|x86.ActiveCfg = Debug|Win32
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Debug|x86.Build.0 = Debug|Win32
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Debug|x86.Deploy.0 = Debug|Win32
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Release|Any CPU.ActiveCfg = Release|Win32
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Release|x64.ActiveCfg = Release|x64
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Release|x64.Build.0 = Release|x64
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Release|x86.ActiveCfg = Release|Win32
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Release|x86.Build.0 = Release|Win32
+		{7F87406C-A3C8-4139-A68D-E4C344294A67}.Release|x86.Deploy.0 = Release|Win32
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Debug|x64.ActiveCfg = Debug|x64
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Debug|x64.Build.0 = Debug|x64
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Debug|x86.ActiveCfg = Debug|Win32
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Debug|x86.Build.0 = Debug|Win32
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Debug|x86.Deploy.0 = Debug|Win32
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Release|Any CPU.ActiveCfg = Release|Win32
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Release|x64.ActiveCfg = Release|x64
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Release|x64.Build.0 = Release|x64
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Release|x86.ActiveCfg = Release|Win32
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Release|x86.Build.0 = Release|Win32
+		{1533E271-F61B-441B-8B74-59FB61DF0552}.Release|x86.Deploy.0 = Release|Win32
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Debug|x64.Build.0 = Debug|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Debug|x86.Build.0 = Debug|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Release|x64.ActiveCfg = Release|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Release|x64.Build.0 = Release|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Release|x86.ActiveCfg = Release|Any CPU
+		{7E268085-1046-4362-80CB-2977FF826DCA}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -7633,6 +7773,17 @@ Global
 		{C3A0F425-669F-46A8-893F-CF449A6DAE56} = {00B2DD87-7E2A-4460-BE1B-5E18B1062B7F}
 		{19189670-E206-471D-94F8-7D3D545E5020} = {00B2DD87-7E2A-4460-BE1B-5E18B1062B7F}
 		{E9408723-E6A9-4715-B906-3B25B0238ABA} = {6276A9A0-791B-49C1-AD8F-50AC47CDC196}
+		{8DA61885-B95E-4BA1-A752-C79B6597FC44} = {41BB7BA4-AC08-4E9A-83EA-6D587A5B951C}
+		{D62AF49B-F9FE-4794-AC39-A473FF13CA81} = {D67E977E-75DF-41EE-8315-6DBF5C2B7357}
+		{EC82302F-D2F0-4727-99D1-EABC0DD9DC3B} = {D62AF49B-F9FE-4794-AC39-A473FF13CA81}
+		{55494E58-E061-4C4C-A0A8-837008E72F85} = {D62AF49B-F9FE-4794-AC39-A473FF13CA81}
+		{1EAC8125-1765-4E2D-8CBE-56DC98A1C8C1} = {D62AF49B-F9FE-4794-AC39-A473FF13CA81}
+		{CAC1267B-8778-4257-AAC6-CAF481723B01} = {D62AF49B-F9FE-4794-AC39-A473FF13CA81}
+		{09D9D1D6-2951-4E14-BC35-76A23CF9391A} = {D62AF49B-F9FE-4794-AC39-A473FF13CA81}
+		{D57EA297-6DC2-4BC0-8C91-334863327863} = {D62AF49B-F9FE-4794-AC39-A473FF13CA81}
+		{7F87406C-A3C8-4139-A68D-E4C344294A67} = {D62AF49B-F9FE-4794-AC39-A473FF13CA81}
+		{1533E271-F61B-441B-8B74-59FB61DF0552} = {D62AF49B-F9FE-4794-AC39-A473FF13CA81}
+		{7E268085-1046-4362-80CB-2977FF826DCA} = {D62AF49B-F9FE-4794-AC39-A473FF13CA81}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {3E8720B3-DBDD-498C-B383-2CC32A054E8F}

diff --git a/src/Servers/IIS/AspNetCoreModuleV2/InProcessRequestHandler/managedexports.cpp b/src/Servers/IIS/AspNetCoreModuleV2/InProcessRequestHandler/managedexports.cpp
@@ -10,6 +10,50 @@ extern bool g_fInProcessApplicationCreated;
 extern std::string g_errorPageContent;
 extern IHttpServer* g_pHttpServer;
 
+//
+// Add support for certain HTTP/2.0 features like trailing headers
+// and GOAWAY or RST_STREAM frames.
+//
+
+class __declspec(uuid("1a2acc57-cae2-4f28-b4ab-00c8f96b12ec"))
+    IHttpResponse4 : public IHttpResponse3
+{
+public:
+    virtual
+        HRESULT
+        DeleteTrailer(
+            _In_ PCSTR  pszHeaderName
+        ) = 0;
+
+    virtual
+        PCSTR
+        GetTrailer(
+            _In_  PCSTR    pszHeaderName,
+            _Out_ USHORT* pcchHeaderValue = NULL
+        ) const = 0;
+
+    virtual
+        VOID
+        ResetStream(
+            _In_ ULONG errorCode
+        ) = 0;
+
+    virtual
+        VOID
+        SetNeedGoAway(
+            VOID
+        ) = 0;
+
+    virtual
+        HRESULT
+        SetTrailer(
+            _In_ PCSTR  pszHeaderName,
+            _In_ PCSTR  pszHeaderValue,
+            _In_ USHORT cchHeaderValue,
+            _In_ BOOL fReplace
+        ) = 0;
+};
+
 //
 // Initialization export
 //
@@ -517,4 +561,32 @@ http_set_startup_error_page_content(_In_ byte* errorPageContent, int length)
     memcpy(&g_errorPageContent[0], errorPageContent, length);
 }
 
+EXTERN_C __MIDL_DECLSPEC_DLLEXPORT
+HRESULT
+http_has_response4(
+    _In_ IN_PROCESS_HANDLER* pInProcessHandler,
+    _Out_ BOOL* supportsTrailers
+)
+{
+    IHttpResponse4* pHttpResponse;
+
+    HRESULT hr = HttpGetExtendedInterface(g_pHttpServer, pInProcessHandler->QueryHttpContext()->GetResponse(), &pHttpResponse);
+    *supportsTrailers = SUCCEEDED(hr);
+
+    return 0;
+}
+
+EXTERN_C __MIDL_DECLSPEC_DLLEXPORT
+HRESULT
+http_response_set_trailer(
+    _In_ IN_PROCESS_HANDLER* pInProcessHandler,
+    _In_ PCSTR pszHeaderName,
+    _In_ PCSTR pszHeaderValue,
+    _In_ USHORT usHeaderValueLength,
+    _In_ BOOL fReplace)
+{
+    // always unknown
+    IHttpResponse4* pHttpResponse = (IHttpResponse4*)pInProcessHandler->QueryHttpContext()->GetResponse();
+    return pHttpResponse->SetTrailer(pszHeaderName, pszHeaderValue, usHeaderValueLength, fReplace);
+}
 // End of export
diff --git a/src/Servers/IIS/IIS/src/Core/IISHttpContext.FeatureCollection.cs b/src/Servers/IIS/IIS/src/Core/IISHttpContext.FeatureCollection.cs
@@ -32,7 +32,8 @@ internal partial class IISHttpContext : IFeatureCollection,
                                             IServerVariablesFeature,
                                             ITlsConnectionFeature,
                                             IHttpBodyControlFeature,
-                                            IHttpMaxRequestBodySizeFeature
+                                            IHttpMaxRequestBodySizeFeature,
+                                            IHttpResponseTrailersFeature
     {
         // 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.
@@ -376,6 +377,23 @@ unsafe X509Certificate2 ITlsConnectionFeature.ClientCertificate
             }
         }
 
+        internal IHttpResponseTrailersFeature GetResponseTrailersFeature()
+        {
+            // Check version is above 2.
+            if (HttpVersion >= System.Net.HttpVersion.Version20 && NativeMethods.HttpSupportTrailer(_pInProcessHandler))
+            {
+                return this;
+            }
+
+            return null;
+        }
+
+        IHeaderDictionary IHttpResponseTrailersFeature.Trailers
+        {
+            get => ResponseTrailers ??= HttpResponseTrailers;
+            set => ResponseTrailers = value;
+        }
+
         void IHttpResponseBodyFeature.DisableBuffering()
         {
             NativeMethods.HttpDisableBuffering(_pInProcessHandler);

diff --git a/src/Servers/IIS/IIS/src/Core/IISHttpContext.Features.cs b/src/Servers/IIS/IIS/src/Core/IISHttpContext.Features.cs
@@ -28,6 +28,7 @@ internal partial class IISHttpContext
         private static readonly Type IISHttpContextType = typeof(IISHttpContext);
         private static readonly Type IServerVariablesFeature = typeof(global::Microsoft.AspNetCore.Http.Features.IServerVariablesFeature);
         private static readonly Type IHttpMaxRequestBodySizeFeature = typeof(global::Microsoft.AspNetCore.Http.Features.IHttpMaxRequestBodySizeFeature);
+        private static readonly Type IHttpResponseTrailersFeature = typeof(global::Microsoft.AspNetCore.Http.Features.IHttpResponseTrailersFeature);
 
         private object _currentIHttpRequestFeature;
         private object _currentIHttpResponseFeature;
@@ -48,6 +49,7 @@ internal partial class IISHttpContext
         private object _currentIHttpBodyControlFeature;
         private object _currentIServerVariablesFeature;
         private object _currentIHttpMaxRequestBodySizeFeature;
+        private object _currentIHttpResponseTrailersFeature;
 
         private void Initialize()
         {
@@ -63,6 +65,7 @@ private void Initialize()
             _currentIServerVariablesFeature = this;
             _currentIHttpMaxRequestBodySizeFeature = this;
             _currentITlsConnectionFeature = this;
+            _currentIHttpResponseTrailersFeature = GetResponseTrailersFeature();
         }
 
         internal object FastFeatureGet(Type key)
@@ -147,6 +150,10 @@ internal object FastFeatureGet(Type key)
             {
                 return _currentIHttpMaxRequestBodySizeFeature;
             }
+            if (key == IHttpResponseTrailersFeature)
+            {
+                return _currentIHttpResponseTrailersFeature;
+            }
 
             return ExtraFeatureGet(key);
         }
@@ -249,6 +256,10 @@ internal void FastFeatureSet(Type key, object feature)
             {
                 _currentIHttpMaxRequestBodySizeFeature = feature;
             }
+            if (key == IHttpResponseTrailersFeature)
+            {
+                _currentIHttpResponseTrailersFeature = feature;
+            }
             if (key == IISHttpContextType)
             {
                 throw new InvalidOperationException("Cannot set IISHttpContext in feature collection");
@@ -334,6 +345,10 @@ private IEnumerable<KeyValuePair<Type, object>> FastEnumerable()
             {
                 yield return new KeyValuePair<Type, object>(IHttpMaxRequestBodySizeFeature, _currentIHttpMaxRequestBodySizeFeature as global::Microsoft.AspNetCore.Http.Features.IHttpMaxRequestBodySizeFeature);
             }
+            if (_currentIHttpResponseTrailersFeature != null)
+            {
+                yield return new KeyValuePair<Type, object>(IHttpResponseTrailersFeature, _currentIHttpResponseTrailersFeature as global::Microsoft.AspNetCore.Http.Features.IHttpResponseTrailersFeature);
+            }
 
             if (MaybeExtra != null)
             {