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Document kernel-level response buffering in Windows HttpListener #52304

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BillWagner merged 1 commit into from
Mar 16, 2026
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Document kernel-level response buffering in Windows HttpListener #52304

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6 changes: 6 additions & 0 deletions docs/fundamentals/runtime-libraries/system-net-httplistener.md
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Expand Up @@ -44,3 +44,9 @@ An <xref:System.Net.HttpListener> can require client authentication. You can eit
The <xref:System.Net.HttpListener> class is built on top of `HTTP.sys`, which is the kernel mode listener that handles all HTTP traffic for Windows.
`HTTP.sys` provides connection management, bandwidth throttling, and web server logging.
Use the [HttpCfg.exe](/windows/win32/http/httpcfg-exe) tool to add SSL certificates.

Starting in .NET 11, the Windows `HTTP.sys` implementation of <xref:System.Net.HttpListener> supports enabling kernel-level response buffering. When enabled, response data is buffered by `HTTP.sys` before being sent to the client, which can improve throughput for high-latency connections. This can be enabled by calling the <xref:System.AppContext.SetSwitch%2A?displayProperty=nameWithType> method as follows:

```csharp
AppContext.SetSwitch("System.Net.HttpListener.EnableKernelResponseBuffering", true);
```
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