[Test Failure] WinHTTP: System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds

This looks related to #126867 but that test is now disabled.

```
[FAIL] System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds(safeChar: 0x00a0, headerType: Request)
System.Net.Http.HttpRequestException : Error while copying content to a stream.
---- System.IO.IOException : The read operation failed, see inner exception.
-------- System.Net.Http.WinHttpException : Error 12030 calling WINHTTP_CALLBACK_STATUS_REQUEST_ERROR, 'The connection with the server was terminated abnormally'.
at System.Net.Http.HttpContent.LoadIntoBufferAsyncCore(Task, HttpContent.LimitArrayPoolWriteStream) in /_/src/libraries/System.Net.Http/src/System/Net/Http/HttpContent.cs:line 524
at System.Net.Http.HttpClient.g__Core|83_0(HttpRequestMessage, HttpCompletionOption, CancellationTokenSource, Boolean, CancellationTokenSource, CancellationToken) in /_/src/libraries/System.Net.Http/src/System/Net/Http/HttpClient.cs:line 556
```

## Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1564826
Build error leg or test failing: System.Net.Http.Functional.Tests.PlatformHandlerTest_Cookies_Http2.GetAsync_NoPathDefined_CookieAddedWithDefaultPath
Pull request: https://github.com/dotnet/runtime/pull/131526

## Error Message

**DO NOT USE JSON BELOW IF THIS IS A BUILD BREAK** otherwise build analysis will allow pull requests to merge that break the build worse. For a build break, do not use this issue form. Make a regular new issue.

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Build%20Analysis/KnownIssueJsonStepByStep.md).

```json
{
"ErrorMessage": ["System.Net.Http.Functional.Tests.PlatformHandler", "WINHTTP_CALLBACK_STATUS_REQUEST_ERROR"],
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1564826
**Error message validated:** `[System.Net.Http.Functional.Tests.PlatformHandler WINHTTP_CALLBACK_STATUS_REQUEST_ERROR`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 8/24/2026 9:25:03 PM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1596674](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596674)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596674&view=ms.vss-test-web.build-test-results-tab&runId=44077378&resultId=150584)|dotnet/runtime#133763|
|[1596513](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596513)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596513&view=ms.vss-test-web.build-test-results-tab&runId=44076878&resultId=128366)||
|[1596323](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596323)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596323&view=ms.vss-test-web.build-test-results-tab&runId=44076826&resultId=136038)||
|[1596641](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596641)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596641&view=ms.vss-test-web.build-test-results-tab&runId=44076662&resultId=174545)|dotnet/runtime#133416|
|[1596321](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596321)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596321&view=ms.vss-test-web.build-test-results-tab&runId=44069020&resultId=151547)||
|[1596300](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596300)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596300&view=ms.vss-test-web.build-test-results-tab&runId=44069142&resultId=155528)|dotnet/runtime#133890|
|[1596241](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596241)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596241&view=ms.vss-test-web.build-test-results-tab&runId=44068078&resultId=139973)|dotnet/runtime#133884|
|[1595734](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595734)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandlerTest_Cookies_Http2.GetAsync_ReceiveSetCookieHeader_CookieAdded](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595734&view=ms.vss-test-web.build-test-results-tab&runId=44061176&resultId=127352)|dotnet/runtime#133854|
|[1595292](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595292)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595292&view=ms.vss-test-web.build-test-results-tab&runId=44050262&resultId=133308)||
|[1595348](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595348)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595348&view=ms.vss-test-web.build-test-results-tab&runId=44048730&resultId=170156)|dotnet/runtime#129683|
|[1595315](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595315)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595315&view=ms.vss-test-web.build-test-results-tab&runId=44047596&resultId=128086)|dotnet/runtime#133378|
|[1595259](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595259)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595259&view=ms.vss-test-web.build-test-results-tab&runId=44043308&resultId=132218)||
|[1595150](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595150)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandlerTest_Cookies_Http2.GetAsyncWithRedirect_ReceiveSetCookie_CookieSent](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595150&view=ms.vss-test-web.build-test-results-tab&runId=44042012&resultId=181915)|dotnet/runtime#133571|
|[1595201](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595201)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1595201&view=ms.vss-test-web.build-test-results-tab&runId=44042000&resultId=141769)||
|[1594919](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594919)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594919&view=ms.vss-test-web.build-test-results-tab&runId=44031060&resultId=137235)||
|[1594893](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594893)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594893&view=ms.vss-test-web.build-test-results-tab&runId=44030416&resultId=132261)|dotnet/runtime#133384|
|[1594801](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594801)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandlerTest_Cookies_Http2.GetAsync_Redirect_CookiesArePreserved](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594801&view=ms.vss-test-web.build-test-results-tab&runId=44028234&resultId=146598)||
|[1594812](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594812)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594812&view=ms.vss-test-web.build-test-results-tab&runId=44028248&resultId=159691)|dotnet/runtime#132534|
|[1594754](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594754)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594754&view=ms.vss-test-web.build-test-results-tab&runId=44026358&resultId=150731)|dotnet/runtime#133828|
|[1594695](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594695)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594695&view=ms.vss-test-web.build-test-results-tab&runId=44024546&resultId=168388)|dotnet/runtime#133827|
|[1594664](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594664)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594664&view=ms.vss-test-web.build-test-results-tab&runId=44023822&resultId=141107)||
|[1594658](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594658)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594658&view=ms.vss-test-web.build-test-results-tab&runId=44023264&resultId=137290)|dotnet/runtime#133819|
|[1594564](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594564)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594564&view=ms.vss-test-web.build-test-results-tab&runId=44019738&resultId=125617)||
|[1594550](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594550)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594550&view=ms.vss-test-web.build-test-results-tab&runId=44018462&resultId=172399)||
|[1594344](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594344)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandlerTest_Cookies_Http2.GetAsync_SetCookieContainer_CookieSent](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594344&view=ms.vss-test-web.build-test-results-tab&runId=44013120&resultId=142873)||
|[1594316](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594316)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandlerTest_Cookies_Http2.GetAsync_ReceiveSetCookieHeader_CookieAdded](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594316&view=ms.vss-test-web.build-test-results-tab&runId=44011784&resultId=153530)||
|[1594346](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594346)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594346&view=ms.vss-test-web.build-test-results-tab&runId=44011812&resultId=151031)|dotnet/runtime#133800|
|[1594333](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594333)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594333&view=ms.vss-test-web.build-test-results-tab&runId=44010994&resultId=147667)||
|[1594314](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594314)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594314&view=ms.vss-test-web.build-test-results-tab&runId=44010142&resultId=134796)||
|[1594067](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594067)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandlerTest_Cookies_Http2.GetAsync_SetCookieContainerMultipleCookies_CookiesSent](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594067&view=ms.vss-test-web.build-test-results-tab&runId=44004194&resultId=124405)||
|[1594044](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594044)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594044&view=ms.vss-test-web.build-test-results-tab&runId=44000780&resultId=159331)||
|[1593988](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593988)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593988&view=ms.vss-test-web.build-test-results-tab&runId=44000346&resultId=190429)|dotnet/runtime#130050|
|[1593985](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593985)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593985&view=ms.vss-test-web.build-test-results-tab&runId=43998440&resultId=163471)|dotnet/runtime#133773|
|[1593538](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593538)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593538&view=ms.vss-test-web.build-test-results-tab&runId=43991050&resultId=127294)||
|[1593527](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593527)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandlerTest_Cookies_Http2.GetAsync_ReceiveSetCookieHeader_CookieAdded](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593527&view=ms.vss-test-web.build-test-results-tab&runId=43989216&resultId=135993)||
|[1592919](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592919)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_MaxResponseHeadersLength_Http2_Test.SetAfterUse_Throws](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592919&view=ms.vss-test-web.build-test-results-tab&runId=43983472&resultId=142951)||
|[1593288](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593288)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1593288&view=ms.vss-test-web.build-test-results-tab&runId=43980936&resultId=190588)||
|[1592920](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592920)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592920&view=ms.vss-test-web.build-test-results-tab&runId=43972738&resultId=199908)||
|[1592834](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592834)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592834&view=ms.vss-test-web.build-test-results-tab&runId=43970092&resultId=154001)|dotnet/runtime#133699|
|[1592670](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592670)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592670&view=ms.vss-test-web.build-test-results-tab&runId=43966126&resultId=172602)|dotnet/runtime#133637|
|[1592301](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592301)|dotnet/runtime|[System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1592301&view=ms.vss-test-web.build-test-results-tab&runId=43963730&resultId=130535)||
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Displaying 100 of 180 results
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|15|70|180|

Start with the named PlatformHandler_HttpClientHandler_Http2_Test.SendAsync_RequestWithLatin1HeaderValue_Succeeds test and the failing build results. Review the repeated failures and linked pull requests; done means the WinHTTP failure is explained and the test or known-issue handling no longer leaves the build failure unresolved.

Written by the indexing model from the issue text.