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wadepickett merged 5 commits into from
Apr 14, 2026
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Update "What's new in ASP.NET Core in .NET 11" for Preview 3 #36991

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Copilot Apr 13, 2026
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Add What's New include files for ASP.NET Core .NET 11 Preview 3
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Rename preview3 include files to preview-3 to fix build warnings
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6 changes: 5 additions & 1 deletion aspnetcore/release-notes/aspnetcore-11.md
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Expand Up @@ -5,7 +5,7 @@ author: wadepickett
description: Learn about the new features in ASP.NET Core in .NET 11.
ms.author: wpickett
ms.custom: mvc
ms.date: 03/13/2026
ms.date: 04/13/2026
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uid: aspnetcore-11
---
# What's new in ASP.NET Core in .NET 11
Expand Down Expand Up @@ -62,6 +62,10 @@ This section describes miscellaneous new features in .NET 11.

[!INCLUDE[](~/release-notes/aspnetcore-11/includes/performance-improvements-preview2.md)]

[!INCLUDE[](~/release-notes/aspnetcore-11/includes/zstandard-compression-preview3.md)]

[!INCLUDE[](~/release-notes/aspnetcore-11/includes/http3-early-request-processing-preview3.md)]

## Breaking changes

Use the articles in [Breaking changes in .NET](/dotnet/core/compatibility/breaking-changes) to find breaking changes that might apply when upgrading an app to a newer version of .NET.
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3 changes: 3 additions & 0 deletions ...release-notes/aspnetcore-11/includes/http3-early-request-processing-preview3.md
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### HTTP/3 starts processing requests earlier

Kestrel now starts processing HTTP/3 requests without waiting for the control stream and SETTINGS frame first, which reduces first-request latency on new connections.
19 changes: 19 additions & 0 deletions aspnetcore/release-notes/aspnetcore-11/includes/zstandard-compression-preview3.md
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### Zstandard response compression and request decompression

ASP.NET Core now supports [Zstandard (zstd)](https://facebook.github.io/zstd/) for both response compression and request decompression. This adds zstd support to the existing response-compression and request-decompression middleware and enables it by default.

```csharp
var builder = WebApplication.CreateBuilder(args);

builder.Services.AddResponseCompression();
builder.Services.AddRequestDecompression();
builder.Services.Configure<ZstandardCompressionProviderOptions>(options =>
{
options.CompressionOptions = new ZstandardCompressionOptions
{
Quality = 6 // 1-22, higher = better compression, slower
};
});
```

Thank you [@manandre](https://github.com/manandre) for this contribution!
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