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Add rate-limiting RetryAfter fixes to What's New for .NET 11 Preview 4 #37151

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Add rate-limiting RetryAfter fixes to What's New for .NET 11 Preview 4 #37151

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Add rate-limiting fixes include file for preview4
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Add code sample from source release notes to rate-limiting include file
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4 changes: 3 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: 05/13/2026
ms.date: 05/14/2026
uid: aspnetcore-11
---
# What's new in ASP.NET Core in .NET 11
Expand Down Expand Up @@ -80,6 +80,8 @@ This section describes miscellaneous new features in .NET 11.

[!INCLUDE[](~/release-notes/aspnetcore-11/includes/runtime-async-shared-framework-preview4.md)]

[!INCLUDE[](~/release-notes/aspnetcore-11/includes/rate-limiting-retry-after-preview-4.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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11 changes: 11 additions & 0 deletions ...ore/release-notes/aspnetcore-11/includes/rate-limiting-retry-after-preview-4.md
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### Rate-limiting middleware returns accurate `Retry-After` headers

The <xref:System.Threading.RateLimiting.FixedWindowRateLimiter> now reports a <xref:System.Threading.RateLimiting.MetadataName.RetryAfter> metadata value that accurately reflects the next window boundary. The rate-limiting middleware uses this metadata to set the `Retry-After` response header, so clients that exceed the rate limit automatically receive a meaningful retry interval without any extra configuration.

Previously, the `RetryAfter` metadata wasn't reliably set, which meant rejected responses either lacked the header or contained an unhelpful value. With this fix, any app that uses the rate-limiting middleware with a <xref:System.Threading.RateLimiting.FixedWindowRateLimiter> benefits from correct `Retry-After` headers automatically.
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Additional fixes in `System.Threading.RateLimiting` resolve an issue where <xref:System.Threading.RateLimiting.TokenBucketRateLimiter> mishandled partial token refills during zero-permit acquisition, and improve `System.Threading.RateLimiting.ChainedRateLimiter` to correctly forward idle-duration and replenishment behavior from its inner limiters.

For more information, see [Rate limiting middleware in ASP.NET Core](/aspnet/core/performance/rate-limit).

Thank you [@asbjornvad](https://github.com/asbjornvad) and [@apoorvdarshan](https://github.com/apoorvdarshan) for these contributions!
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