Add support for Lambda Response Streaming

.autover/changes/c27a62e6-91ca-4a59-9406-394866cdfa62.json

@@ -0,0 +1,18 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Lambda.RuntimeSupport",
+      "Type": "Minor",
+      "ChangelogMessages": [
+        "(Preview) Add response streaming support"
+      ]
+    },
+    {
+      "Name": "Amazon.Lambda.Core",
+      "Type": "Minor",
+      "ChangelogMessages": [
+        "(Preview) Add response streaming support"
+      ]
+    }	
+  ]
+}

.autover/changes/f0d5a912-bcfa-4244-96cb-ac3c847f877c.json

@@ -0,0 +1,27 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Lambda.AspNetCoreServer",
+      "Type": "Major",
+      "ChangelogMessages": [
+        "[Breaking] Update build targets from .NET 6 and 8 to .NET 8 and 10",
+		"[Preview] Add support for Lambda Response Streaming enabled by setting the EnableResponseStreaming property from the base class AbstractAspNetCoreFunction"
+      ]
+    },
+    {
+      "Name": "Amazon.Lambda.AspNetCoreServer.Hosting",
+      "Type": "Major",
+      "ChangelogMessages": [
+        "[Breaking] Update build targets from .NET 6 and 8 to .NET 8 and 10",
+		"[Preview] Add support for Lambda Response Streaming enabled by setting the EnableResponseStreaming property on the HostingOptions object passed into the AddAWSLambdaHosting method"
+      ]
+    },
+    {
+      "Name": "Amazon.Lambda.Logging.AspNetCore",
+      "Type": "Major",
+      "ChangelogMessages": [
+        "[Breaking] Update build targets from .NET 6 and 8 to .NET 8 and 10"
+      ]
+    }	
+  ]
+}

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @aws/aws-sdk-dotnet-team

.gitignore

@@ -4,6 +4,8 @@
 *.suo
 *.user
 
+**/.kiro/
+
 ####################
 # Build/Test folders
 ####################

CHANGELOG.md

@@ -1,3 +1,23 @@
+## Release 2026-04-14
+
+### Amazon.Lambda.TestTool.BlazorTester (0.17.1)
+* Minor fixes to improve the testability of the package
+### Amazon.Lambda.RuntimeSupport (1.14.3)
+* Minor fixes to improve the testability of the package
+### Amazon.Lambda.Annotations (1.13.0)
+* Added [FunctionUrl] attribute for configuring Lambda functions with Function URL endpoints, including optional CORS support
+
+## Release 2026-04-13 #2
+
+### Amazon.Lambda.Annotations (1.12.0)
+* treat warnings as errors and fix unshipped.md
+* Added [S3Event] annotation attribute for declaratively configuring S3 event-triggered Lambda functions with support for bucket reference, event types, key prefix/suffix filters, and enabled state.
+
+## Release 2026-04-08
+
+### Amazon.Lambda.Annotations (1.11.0)
+* Added [ALBApi] attribute for configuring Lambda functions as targets behind an Application Load Balancer
+
 ## Release 2026-03-27
 
 ### Amazon.Lambda.Annotations (1.10.0)

Libraries/Amazon.Lambda.Annotations.slnf

@@ -16,7 +16,10 @@
       "test\\TestCustomAuthorizerApp.IntegrationTests\\TestCustomAuthorizerApp.IntegrationTests.csproj",
       "test\\TestServerlessApp.IntegrationTests\\TestServerlessApp.IntegrationTests.csproj",
       "test\\TestServerlessApp.NET8\\TestServerlessApp.NET8.csproj",
-      "test\\TestServerlessApp\\TestServerlessApp.csproj"
+      "src\\Amazon.Lambda.ApplicationLoadBalancerEvents\\Amazon.Lambda.ApplicationLoadBalancerEvents.csproj",
+      "test\\TestServerlessApp\\TestServerlessApp.csproj",
+      "test\\TestServerlessApp.ALB\\TestServerlessApp.ALB.csproj",
+      "test\\TestServerlessApp.ALB.IntegrationTests\\TestServerlessApp.ALB.IntegrationTests.csproj"
     ]
   }
 }

Libraries/Amazon.Lambda.RuntimeSupport.slnf

@@ -14,12 +14,13 @@
       "src\\SnapshotRestore.Registry\\SnapshotRestore.Registry.csproj",
       "test\\Amazon.Lambda.RuntimeSupport.Tests\\Amazon.Lambda.RuntimeSupport.IntegrationTests\\Amazon.Lambda.RuntimeSupport.IntegrationTests.csproj",
       "test\\Amazon.Lambda.RuntimeSupport.Tests\\Amazon.Lambda.RuntimeSupport.UnitTests\\Amazon.Lambda.RuntimeSupport.UnitTests.csproj",
+      "test\\Amazon.Lambda.RuntimeSupport.Tests\\AspNetCoreStreamingApiGatewayTest\\AspNetCoreStreamingApiGatewayTest.csproj",
       "test\\Amazon.Lambda.RuntimeSupport.Tests\\CustomRuntimeAspNetCoreMinimalApiCustomSerializerTest\\CustomRuntimeAspNetCoreMinimalApiCustomSerializerTest.csproj",
       "test\\Amazon.Lambda.RuntimeSupport.Tests\\CustomRuntimeAspNetCoreMinimalApiTest\\CustomRuntimeAspNetCoreMinimalApiTest.csproj",
       "test\\Amazon.Lambda.RuntimeSupport.Tests\\CustomRuntimeFunctionTest\\CustomRuntimeFunctionTest.csproj",
-      "test\\SnapshotRestore.Registry.Tests\\SnapshotRestore.Registry.Tests.csproj",
       "test\\HandlerTestNoSerializer\\HandlerTestNoSerializer.csproj",
-      "test\\HandlerTest\\HandlerTest.csproj"
+      "test\\HandlerTest\\HandlerTest.csproj",
+      "test\\SnapshotRestore.Registry.Tests\\SnapshotRestore.Registry.Tests.csproj"
     ]
   }
 }

Libraries/Libraries.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
-VisualStudioVersion = 17.0.31717.71
+# Visual Studio Version 18
+VisualStudioVersion = 18.3.11512.155
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{AAB54E74-20B1-42ED-BC3D-CE9F7BC7FD12}"
 EndProject
@@ -151,6 +151,14 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TestCustomAuthorizerApp.Int
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TestCustomAuthorizerApp", "test\TestCustomAuthorizerApp\TestCustomAuthorizerApp.csproj", "{3BFA4B73-BA61-4578-833B-C5B3A16EDA9E}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TestServerlessApp.ALB", "test\TestServerlessApp.ALB\TestServerlessApp.ALB.csproj", "{8F7C617D-C611-4DC6-A07C-033F13C1835D}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TestServerlessApp.ALB.IntegrationTests", "test\TestServerlessApp.ALB.IntegrationTests\TestServerlessApp.ALB.IntegrationTests.csproj", "{80594C21-C6EB-469E-83CC-68F9F661CA5E}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ResponseStreamingFunctionHandlers", "test\Amazon.Lambda.RuntimeSupport.Tests\ResponseStreamingFunctionHandlers\ResponseStreamingFunctionHandlers.csproj", "{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AspNetCoreStreamingApiGatewayTest", "test\Amazon.Lambda.RuntimeSupport.Tests\AspNetCoreStreamingApiGatewayTest\AspNetCoreStreamingApiGatewayTest.csproj", "{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -941,6 +949,54 @@ Global
 		{3BFA4B73-BA61-4578-833B-C5B3A16EDA9E}.Release|x64.Build.0 = Release|Any CPU
 		{3BFA4B73-BA61-4578-833B-C5B3A16EDA9E}.Release|x86.ActiveCfg = Release|Any CPU
 		{3BFA4B73-BA61-4578-833B-C5B3A16EDA9E}.Release|x86.Build.0 = Release|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Debug|x64.Build.0 = Debug|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Debug|x86.Build.0 = Debug|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Release|x64.ActiveCfg = Release|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Release|x64.Build.0 = Release|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Release|x86.ActiveCfg = Release|Any CPU
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D}.Release|x86.Build.0 = Release|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Debug|x64.Build.0 = Debug|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Debug|x86.Build.0 = Debug|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Release|x64.ActiveCfg = Release|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Release|x64.Build.0 = Release|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Release|x86.ActiveCfg = Release|Any CPU
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E}.Release|x86.Build.0 = Release|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Debug|x64.Build.0 = Debug|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Debug|x86.Build.0 = Debug|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Release|x64.ActiveCfg = Release|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Release|x64.Build.0 = Release|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Release|x86.ActiveCfg = Release|Any CPU
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9}.Release|x86.Build.0 = Release|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Debug|x64.Build.0 = Debug|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Debug|x86.Build.0 = Debug|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Release|x64.ActiveCfg = Release|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Release|x64.Build.0 = Release|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Release|x86.ActiveCfg = Release|Any CPU
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -1015,6 +1071,10 @@ Global
 		{8D03BDF3-7078-4B46-A3F1-C73BE6D6CE0D} = {1DE4EE60-45BA-4EF7-BE00-B9EB861E4C69}
 		{8EEDD576-7FC4-4FAC-A5A2-F58562753A53} = {1DE4EE60-45BA-4EF7-BE00-B9EB861E4C69}
 		{3BFA4B73-BA61-4578-833B-C5B3A16EDA9E} = {1DE4EE60-45BA-4EF7-BE00-B9EB861E4C69}
+		{8F7C617D-C611-4DC6-A07C-033F13C1835D} = {1DE4EE60-45BA-4EF7-BE00-B9EB861E4C69}
+		{80594C21-C6EB-469E-83CC-68F9F661CA5E} = {1DE4EE60-45BA-4EF7-BE00-B9EB861E4C69}
+		{E404A7AC-812B-BC03-CA76-02C0BC2BA7F9} = {B5BD0336-7D08-492C-8489-42C987E29B39}
+		{0768FA72-CF49-2B59-BC4C-E4CE579E5D93} = {B5BD0336-7D08-492C-8489-42C987E29B39}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {503678A4-B8D1-4486-8915-405A3E9CF0EB}

Libraries/src/Amazon.Lambda.Annotations.SourceGenerator/Amazon.Lambda.Annotations.SourceGenerator.csproj

@@ -20,7 +20,8 @@
     <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
     <IncludeBuildOutput>false</IncludeBuildOutput>
 
-    <Version>1.10.0</Version>
+    <Version>1.13.0</Version>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <!-- Delay setting the package id till after resolving dependencies to avoid ambigious errors. -->

Libraries/src/Amazon.Lambda.Annotations.SourceGenerator/Diagnostics/AnalyzerReleases.Unshipped.md

@@ -16,3 +16,8 @@ AWSLambda0128 | AWSLambdaCSharpGenerator | Error | Authorizer Payload Version Mi
 AWSLambda0129 | AWSLambdaCSharpGenerator | Error | Missing LambdaFunction Attribute
 AWSLambda0130 | AWSLambdaCSharpGenerator | Error | Invalid return type IAuthorizerResult
 AWSLambda0131 | AWSLambdaCSharpGenerator | Error | FromBody not supported on Authorizer functions
+AWSLambda0132 | AWSLambdaCSharpGenerator | Error | Invalid ALBApiAttribute
+AWSLambda0133 | AWSLambdaCSharpGenerator | Error | ALB Listener Reference Not Found
+AWSLambda0134 | AWSLambdaCSharpGenerator | Error | FromRoute not supported on ALB functions
+AWSLambda0135 | AWSLambdaCSharpGenerator | Error | Unmapped parameter on ALB function
+AWSLambda0136 | AWSLambdaCSharpGenerator | Error | Invalid S3EventAttribute

Libraries/src/Amazon.Lambda.Annotations.SourceGenerator/Diagnostics/DiagnosticDescriptors.cs

@@ -242,5 +242,44 @@ public static class DiagnosticDescriptors
             category: "AWSLambdaCSharpGenerator",
             DiagnosticSeverity.Error,
             isEnabledByDefault: true);
+
+        public static readonly DiagnosticDescriptor InvalidAlbApiAttribute = new DiagnosticDescriptor(
+            id: "AWSLambda0132",
+            title: "Invalid ALBApiAttribute",
+            messageFormat: "Invalid ALBApiAttribute encountered: {0}",
+            category: "AWSLambdaCSharpGenerator",
+            DiagnosticSeverity.Error,
+            isEnabledByDefault: true);
+
+        public static readonly DiagnosticDescriptor AlbListenerReferenceNotFound = new DiagnosticDescriptor(
+            id: "AWSLambda0133",
+            title: "ALB Listener Reference Not Found",
+            messageFormat: "The ALBApi ListenerArn references '@{0}', but no resource or parameter named '{0}' was found in the CloudFormation template. Add the listener resource to the template or correct the reference name.",
+            category: "AWSLambdaCSharpGenerator",
+            DiagnosticSeverity.Error,
+            isEnabledByDefault: true);
+
+        public static readonly DiagnosticDescriptor FromRouteNotSupportedOnAlb = new DiagnosticDescriptor(
+            id: "AWSLambda0134",
+            title: "FromRoute not supported on ALB functions",
+            messageFormat: "[FromRoute] is not supported on ALB functions. ALB does not support route path template parameters. Use [FromHeader], [FromQuery], or [FromBody] instead.",
+            category: "AWSLambdaCSharpGenerator",
+            DiagnosticSeverity.Error,
+            isEnabledByDefault: true);
+
+        public static readonly DiagnosticDescriptor AlbUnmappedParameter = new DiagnosticDescriptor(
+            id: "AWSLambda0135",
+            title: "Unmapped parameter on ALB function",
+            messageFormat: "Parameter '{0}' on ALB function has no binding attribute. Use [FromHeader], [FromQuery], [FromBody], or [FromServices], or use the ApplicationLoadBalancerRequest or ILambdaContext types.",
+            category: "AWSLambdaCSharpGenerator",
+            DiagnosticSeverity.Error,
+            isEnabledByDefault: true);
+
+        public static readonly DiagnosticDescriptor InvalidS3EventAttribute = new DiagnosticDescriptor(id: "AWSLambda0136",
+            title: "Invalid S3EventAttribute",
+            messageFormat: "Invalid S3EventAttribute encountered: {0}",
+            category: "AWSLambdaCSharpGenerator",
+            DiagnosticSeverity.Error,
+            isEnabledByDefault: true);
     }
 }

Libraries/src/Amazon.Lambda.Annotations.SourceGenerator/Extensions/ParameterListExtension.cs

@@ -17,14 +17,20 @@ public static bool HasConvertibleParameter(this IList<ParameterModel> parameters
                     return false;
                 }
 
+                // ALB request types are forwarded to lambda method if specified, there is no parameter conversion required.
+                if (TypeFullNames.ALBRequests.Contains(p.Type.FullName))
+                {
+                    return false;
+                }
+
                 // ILambdaContext is forwarded to lambda method if specified, there is no parameter conversion required.
                 if (p.Type.FullName == TypeFullNames.ILambdaContext)
                 {
                     return false;
                 }
 
                 // Body parameter with target type as string doesn't require conversion because body is string by nature.
-                if (p.Attributes.Any(att => att.Type.FullName == TypeFullNames.FromBodyAttribute) && p.Type.IsString())
+                if (p.Attributes.Any(att => att.Type.FullName == TypeFullNames.FromBodyAttribute || att.Type.FullName == TypeFullNames.ALBFromBodyAttribute) && p.Type.IsString())
                 {
                     return false;
                 }

Libraries/src/Amazon.Lambda.Annotations.SourceGenerator/Models/Attributes/ALBApiAttributeBuilder.cs

@@ -0,0 +1,68 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+using Amazon.Lambda.Annotations.ALB;
+using Microsoft.CodeAnalysis;
+using System;
+using System.Linq;
+
+namespace Amazon.Lambda.Annotations.SourceGenerator.Models.Attributes
+{
+    /// <summary>
+    /// Builder for <see cref="ALBApiAttribute"/>.
+    /// </summary>
+    public class ALBApiAttributeBuilder
+    {
+        public static ALBApiAttribute Build(AttributeData att)
+        {
+            if (att.ConstructorArguments.Length != 3)
+            {
+                throw new NotSupportedException($"{TypeFullNames.ALBApiAttribute} must have constructor with 3 arguments.");
+            }
+
+            var listenerArn = att.ConstructorArguments[0].Value as string;
+            var pathPattern = att.ConstructorArguments[1].Value as string;
+            var priority = (int)att.ConstructorArguments[2].Value;
+
+            var data = new ALBApiAttribute(listenerArn, pathPattern, priority);
+
+            foreach (var pair in att.NamedArguments)
+            {
+                if (pair.Key == nameof(data.MultiValueHeaders) && pair.Value.Value is bool multiValueHeaders)
+                {
+                    data.MultiValueHeaders = multiValueHeaders;
+                }
+                else if (pair.Key == nameof(data.HostHeader) && pair.Value.Value is string hostHeader)
+                {
+                    data.HostHeader = hostHeader;
+                }
+                else if (pair.Key == nameof(data.HttpMethod) && pair.Value.Value is string httpMethod)
+                {
+                    data.HttpMethod = httpMethod;
+                }
+                else if (pair.Key == nameof(data.ResourceName) && pair.Value.Value is string resourceName)
+                {
+                    data.ResourceName = resourceName;
+                }
+                else if (pair.Key == nameof(data.HttpHeaderConditionName) && pair.Value.Value is string httpHeaderConditionName)
+                {
+                    data.HttpHeaderConditionName = httpHeaderConditionName;
+                }
+                else if (pair.Key == nameof(data.HttpHeaderConditionValues) && !pair.Value.IsNull)
+                {
+                    data.HttpHeaderConditionValues = pair.Value.Values.Select(v => v.Value as string).ToArray();
+                }
+                else if (pair.Key == nameof(data.QueryStringConditions) && !pair.Value.IsNull)
+                {
+                    data.QueryStringConditions = pair.Value.Values.Select(v => v.Value as string).ToArray();
+                }
+                else if (pair.Key == nameof(data.SourceIpConditions) && !pair.Value.IsNull)
+                {
+                    data.SourceIpConditions = pair.Value.Values.Select(v => v.Value as string).ToArray();
+                }
+            }
+
+            return data;
+        }
+    }
+}

Libraries/src/Amazon.Lambda.Annotations.SourceGenerator/Models/Attributes/ALBFromHeaderAttributeBuilder.cs

@@ -0,0 +1,28 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+using Amazon.Lambda.Annotations.ALB;
+using Microsoft.CodeAnalysis;
+
+namespace Amazon.Lambda.Annotations.SourceGenerator.Models.Attributes
+{
+    /// <summary>
+    /// Builder for <see cref="ALB.FromHeaderAttribute"/>.
+    /// </summary>
+    public class ALBFromHeaderAttributeBuilder
+    {
+        public static ALB.FromHeaderAttribute Build(AttributeData att)
+        {
+            var data = new ALB.FromHeaderAttribute();
+            foreach (var pair in att.NamedArguments)
+            {
+                if (pair.Key == nameof(data.Name) && pair.Value.Value is string value)
+                {
+                    data.Name = value;
+                }
+            }
+
+            return data;
+        }
+    }
+}