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Remove RequiresPreviewFeatures attribute for Lambda Response Streaming #2467

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1b4d82a
Remove RequiresPreviewFeatures attribute for Lambda Response Streamin…
normj Jul 8, 2026
92d4f08
Address PR comments
normj Jul 8, 2026
df49879
Address PR comments
normj Jul 8, 2026
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49 changes: 49 additions & 0 deletions .autover/changes/9e75413c-9cb6-4521-aaca-09b557fff2b3.json
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@@ -0,0 +1,49 @@
{
"Projects": [
{
"Name": "Amazon.Lambda.Core",
"Type": "Minor",
"ChangelogMessages": [
"Lambda response streaming is now available as GA. The RequiresPreviewFeatures attribute has been removed",
"The LambdaLogger.ConfigureStructuredLogging API has been deployed to the managed runtime. The RequiresPreviewFeatures attribute has been removed"
]
},
{
"Name": "Amazon.Lambda.Annotations",
"Type": "Minor",

@GarrettBeatty GarrettBeatty Jul 8, 2026

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i dont see any annotation changes in this pr but i see it in the changefile?

@normj normj Jul 8, 2026

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The csproj files have the project reference to Amazon.Lambda.Core. So when we do the release the project reference will cause the dependency version for the generated nuspec file to have the new version of Amazon.Lambda.Core. So there is nothing to change in the csproj file. If it was a package reference then you would see a csrpoj change.

"ChangelogMessages": [
"Updated Amazon.Lambda.Core dependency to include Lambda Response Streaming support."
]
},
{
"Name": "Amazon.Lambda.AspNetCoreServer",
"Type": "Minor",
"ChangelogMessages": [
"Removed RequiresPreviewFeatures attribute for Lambda Response Streaming.",
"Updated Amazon.Lambda.Core dependency to include Lambda Response Streaming support."
]
},
{
"Name": "Amazon.Lambda.AspNetCoreServer.Hosting",
"Type": "Minor",
"ChangelogMessages": [
"Removed RequiresPreviewFeatures attribute for Lambda Response Streaming.",
"Updated Amazon.Lambda.Core dependency to include Lambda Response Streaming support."
]
},
{
"Name": "Amazon.Lambda.PowerShellHost",
"Type": "Minor",
"ChangelogMessages": [
"Updated Amazon.Lambda.Core dependency to include Lambda Response Streaming support."

@GarrettBeatty GarrettBeatty Jul 8, 2026

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are you missing some csproj updates or somthing somewhere?

@normj normj Jul 8, 2026

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The csproj files have the project reference to Amazon.Lambda.Core. So when we do the release the project reference will cause the dependency version for the generated nuspec file to have the new version of Amazon.Lambda.Core. So there is nothing to change in the csproj file. If it was a package reference then you would see a csrpoj change.

]
},
{
"Name": "Amazon.Lambda.RuntimeSupport",
"Type": "Minor",
"ChangelogMessages": [
"Updated Amazon.Lambda.Core dependency to include Lambda Response Streaming support."
]
}
]
}
1 change: 0 additions & 1 deletion Libraries/src/Amazon.Lambda.AspNetCoreServer.Hosting/HostingOptions.cs
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Expand Up @@ -39,7 +39,6 @@ public class HostingOptions
/// <c>FunctionHandlerAsync</c> writes directly to the Lambda response stream and
/// returns <c>null</c>. Requires net8.0 or later.
/// </summary>
[System.Runtime.Versioning.RequiresPreviewFeatures(ParameterizedPreviewMessage)]
public bool EnableResponseStreaming { get; set; } = false;

/// <summary>
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1 change: 0 additions & 1 deletion Libraries/src/Amazon.Lambda.AspNetCoreServer/APIGatewayHttpApiV2ProxyFunction.cs
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Expand Up @@ -59,7 +59,6 @@ private protected override void InternalCustomResponseExceptionHandling(APIGatew
/// instead of <c>multiValueHeaders</c>. API Gateway HTTP API v2 expects the <c>headers</c>
/// format; using <c>multiValueHeaders</c> causes a 500 Internal Server Error.
/// </summary>
[System.Runtime.Versioning.RequiresPreviewFeatures(ParameterizedPreviewMessage)]
protected override Amazon.Lambda.Core.ResponseStreaming.HttpResponseStreamPrelude BuildStreamingPrelude(IHttpResponseFeature responseFeature)
{
var prelude = new Amazon.Lambda.Core.ResponseStreaming.HttpResponseStreamPrelude
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1 change: 0 additions & 1 deletion Libraries/src/Amazon.Lambda.AspNetCoreServer/APIGatewayProxyFunction.cs
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Expand Up @@ -113,7 +113,6 @@ private protected override void InternalCustomResponseExceptionHandling(APIGatew
/// </summary>
/// <param name="responseFeature">The ASP.NET Core response feature for the current invocation.</param>
/// <returns>A populated <see cref="Amazon.Lambda.Core.ResponseStreaming.HttpResponseStreamPrelude"/>.</returns>
[System.Runtime.Versioning.RequiresPreviewFeatures(ParameterizedPreviewMessage)]
protected override Amazon.Lambda.Core.ResponseStreaming.HttpResponseStreamPrelude BuildStreamingPrelude(IHttpResponseFeature responseFeature)
{
var prelude = new Amazon.Lambda.Core.ResponseStreaming.HttpResponseStreamPrelude
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10 changes: 0 additions & 10 deletions Libraries/src/Amazon.Lambda.AspNetCoreServer/AbstractAspNetCoreFunction.cs
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Expand Up @@ -24,12 +24,6 @@ namespace Amazon.Lambda.AspNetCoreServer
/// </summary>
public abstract class AbstractAspNetCoreFunction
{
internal const string ParameterizedPreviewMessage =
"Response streaming is in preview till a new version of .NET Lambda runtime client that supports response streaming " +
"has been deployed to the .NET Lambda managed runtime. Till deployment has been made the feature can be used by deploying as an " +
"executable including the latest version of Amazon.Lambda.RuntimeSupport and setting the \"EnablePreviewFeatures\" in the Lambda " +
"project file to \"true\"";

/// <summary>
/// Key to access the ILambdaContext object from the HttpContext.Items collection.
/// </summary>
Expand Down Expand Up @@ -206,7 +200,6 @@ public void RegisterResponseContentEncodingForContentEncoding(string contentEnco
/// buffering it and returning a typed response object (which will be <c>null</c>).
/// Requires net8.0 or later.
/// </summary>
[System.Runtime.Versioning.RequiresPreviewFeatures(ParameterizedPreviewMessage)]
public virtual bool EnableResponseStreaming { get; set; } = false;


Expand Down Expand Up @@ -678,7 +671,6 @@ protected virtual void PostMarshallResponseFeature(IHttpResponseFeature aspNetCo
/// </summary>
/// <param name="responseFeature">The ASP.NET Core response feature for the current invocation.</param>
/// <returns>A populated <see cref="Amazon.Lambda.Core.ResponseStreaming.HttpResponseStreamPrelude"/>.</returns>
[System.Runtime.Versioning.RequiresPreviewFeatures(ParameterizedPreviewMessage)]
protected abstract Amazon.Lambda.Core.ResponseStreaming.HttpResponseStreamPrelude BuildStreamingPrelude(IHttpResponseFeature responseFeature);

/// <summary>
Expand All @@ -689,7 +681,6 @@ protected virtual void PostMarshallResponseFeature(IHttpResponseFeature aspNetCo
/// </summary>
/// <param name="prelude">The HTTP response prelude containing status code and headers.</param>
/// <returns>A writable <see cref="System.IO.Stream"/> for the response body.</returns>
[System.Runtime.Versioning.RequiresPreviewFeatures(ParameterizedPreviewMessage)]
protected virtual System.IO.Stream CreateLambdaResponseStream(
Amazon.Lambda.Core.ResponseStreaming.HttpResponseStreamPrelude prelude)
{
Expand All @@ -701,7 +692,6 @@ protected virtual System.IO.Stream CreateLambdaResponseStream(
/// <see cref="EnableResponseStreaming"/> is <c>true</c>. Writes the response directly to a
/// <see cref="Amazon.Lambda.Core.ResponseStreaming.LambdaResponseStream"/>.
/// </summary>
[System.Runtime.Versioning.RequiresPreviewFeatures(ParameterizedPreviewMessage)]
private async Task ExecuteStreamingRequestAsync(InvokeFeatures features)
{
var responseFeature = (IHttpResponseFeature)features;
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1 change: 0 additions & 1 deletion Libraries/src/Amazon.Lambda.AspNetCoreServer/ApplicationLoadBalancerFunction.cs
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Expand Up @@ -225,7 +225,6 @@ private protected override void InternalCustomResponseExceptionHandling(Applicat
}

/// <inheritdoc/>
[System.Runtime.Versioning.RequiresPreviewFeatures(ParameterizedPreviewMessage)]
protected override HttpResponseStreamPrelude BuildStreamingPrelude(IHttpResponseFeature responseFeature) => throw new NotImplementedException();

private string GetSingleHeaderValue(ApplicationLoadBalancerRequest request, string headerName)
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2 changes: 0 additions & 2 deletions Libraries/src/Amazon.Lambda.AspNetCoreServer/Internal/StreamingResponseBodyFeature.cs
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Expand Up @@ -3,7 +3,6 @@
using System;
using System.IO;
using System.IO.Pipelines;
using System.Runtime.Versioning;
using System.Threading;
using System.Threading.Tasks;

Expand All @@ -20,7 +19,6 @@ namespace Amazon.Lambda.AspNetCoreServer.Internal
/// <see cref="MemoryStream"/>; after <see cref="StartAsync"/> all writes go directly to the
/// <see cref="LambdaResponseStream"/> obtained from the stream opener delegate.
/// </summary>
[RequiresPreviewFeatures(AbstractAspNetCoreFunction.ParameterizedPreviewMessage)]
internal class StreamingResponseBodyFeature : IHttpResponseBodyFeature
{
private readonly ILogger _logger;
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6 changes: 3 additions & 3 deletions Libraries/src/Amazon.Lambda.Core/LambdaLogger.cs
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@@ -1,6 +1,7 @@
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

using System;
using System.Reflection.Emit;
using System.Runtime.Versioning;
using System.Text;

namespace Amazon.Lambda.Core
Expand Down Expand Up @@ -139,7 +140,6 @@ public static void Log(string level, Exception exception, string message, params
/// When structured logging is enabled this method will allow overriding the default configuration the Lambda runtime uses for structured logging.
/// </summary>
/// <param name="options">The options to use for configuring structured logging.</param>
[RequiresPreviewFeatures("This method is in preview until the latest changes of the .NET Lambda runtime client have been deployed to the Lambda managed runtimes")]
public static void ConfigureStructuredLogging(StructuredLoggingOptions options) => _configureStructuredLoggingAction(options);

internal static void SetConfigureStructuredLoggingAction(Action<StructuredLoggingOptions> configureStructuredLoggingAction)
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2 changes: 0 additions & 2 deletions Libraries/src/Amazon.Lambda.Core/ResponseStreaming/HttpResponseStreamPrelude.cs
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Expand Up @@ -4,7 +4,6 @@
using System;
using System.Collections.Generic;
using System.Net;
using System.Runtime.Versioning;
using System.Text.Json;

namespace Amazon.Lambda.Core.ResponseStreaming
Expand All @@ -15,7 +14,6 @@ namespace Amazon.Lambda.Core.ResponseStreaming
/// headers, and cookies for the response. The prelude must be sent as the first chunk of the response stream, followed by the response body chunks.
/// This allows you to set the status code and headers for the response before sending any of the response body.
/// </summary>
[RequiresPreviewFeatures(LambdaResponseStreamFactory.PreviewMessage)]
public class HttpResponseStreamPrelude
{
/// <summary>
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2 changes: 0 additions & 2 deletions Libraries/src/Amazon.Lambda.Core/ResponseStreaming/LambdaResponseStream.cs
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Expand Up @@ -4,7 +4,6 @@

using System;
using System.IO;
using System.Runtime.Versioning;
using System.Threading;
using System.Threading.Tasks;

Expand All @@ -15,7 +14,6 @@ namespace Amazon.Lambda.Core.ResponseStreaming
/// to the Lambda Runtime API. Returned by <see cref="LambdaResponseStreamFactory.CreateStream"/>.
/// Integrates with standard .NET stream consumers such as <see cref="System.IO.StreamWriter"/>.
/// </summary>
[RequiresPreviewFeatures(LambdaResponseStreamFactory.PreviewMessage)]
public class LambdaResponseStream : Stream
{
private readonly ILambdaResponseStream _responseStream;
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8 changes: 0 additions & 8 deletions Libraries/src/Amazon.Lambda.Core/ResponseStreaming/LambdaResponseStreamFactory.cs
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Expand Up @@ -3,22 +3,14 @@
#if NET8_0_OR_GREATER
using System;
using System.IO;
using System.Runtime.Versioning;

namespace Amazon.Lambda.Core.ResponseStreaming
{
/// <summary>
/// Factory to create Lambda response streams for writing streaming responses in AWS Lambda functions. The created streams are write-only and non-seekable.
/// </summary>
[RequiresPreviewFeatures(LambdaResponseStreamFactory.PreviewMessage)]
public class LambdaResponseStreamFactory
{
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internal const string PreviewMessage =
"Response streaming is in preview till a new version of .NET Lambda runtime client that supports response streaming " +
"has been deployed to the .NET Lambda managed runtime. Till deployment has been made the feature can be used by deploying as an " +
"executable including the latest version of Amazon.Lambda.RuntimeSupport and setting the \"EnablePreviewFeatures\" in the Lambda " +
"project file to \"true\"";

internal const string UninitializedFactoryMessage =
"LambdaResponseStreamFactory is not initialized. This is caused by mismatch versions of Amazon.Lambda.Core and Amazon.Lambda.RuntimeSupport. " +
"Update both packages to the current version to address the issue.";
Expand Down
3 changes: 0 additions & 3 deletions Libraries/test/Amazon.Lambda.AspNetCoreServer.Hosting.Tests/ResponseStreamingHostingTests.cs
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@@ -1,8 +1,6 @@
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0


using System.Runtime.Versioning;
using Amazon.Lambda.AspNetCoreServer.Hosting.Internal;
using Amazon.Lambda.AspNetCoreServer.Test;
using Amazon.Lambda.Core;
Expand All @@ -16,7 +14,6 @@ namespace Amazon.Lambda.AspNetCoreServer.Hosting.Tests;
/// <summary>
/// Tests for response streaming integration in hosting (Requirement 10).
/// </summary>
[RequiresPreviewFeatures]
public class ResponseStreamingHostingTests
{
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[Fact]
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3 changes: 0 additions & 3 deletions ...aries/test/Amazon.Lambda.AspNetCoreServer.Hosting.Tests/ResponseStreamingPropertyTests.cs
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

using System.Runtime.Versioning;

using Amazon.Lambda.AspNetCoreServer.Hosting.Internal;
using Amazon.Lambda.Core;
using Amazon.Lambda.RuntimeSupport;
Expand All @@ -14,7 +12,6 @@

namespace Amazon.Lambda.AspNetCoreServer.Hosting.Tests;

[RequiresPreviewFeatures]
public class ResponseStreamingPropertyTests
{
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private static IServiceProvider BuildServiceProvider(HostingOptions hostingOptions)
Expand Down
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