[release/11.0] Correct HTTP/2 stream window cap test expectations - #134038
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Fixes failure in System.Net.Http.Functional.Tests.SocketsHttpHandler_Http2FlowControl_Test.MaxStreamWindowSize_WhenSet_WindowDoesNotScaleAboveMaximum observed e.g. in https://helixr18s23ayyejvk1x8qcc.blob.core.windows.net/dotnet-runtime-refs-heads-main-599d096511a54659b1/System.Net.Http.Functional.Tests/1/console.a3d71edc.log?helixlogtype=result (no tracking issue yet) ## Summary Remove the stale expectation in `TestClientWindowScalingAsync` that RTT PINGs stop once observed stream credit exceeds 90% of its maximum. RTT estimation belongs to the connection, not an individual stream. The original implementation explicitly removed this optimization because it ignored other streams ([author explanation](#54755 (comment))). No product PING behavior changes are included. The current assertion fails in the remote child before `maxCredit <= MaxWindow` is evaluated; examples include [Windows](https://helixr18s23ayyejvk1x8qcc.blob.core.windows.net/dotnet-runtime-refs-heads-main-599d096511a54659b1/System.Net.Http.Functional.Tests/1/console.a3d71edc.log?helixlogtype=result) and [macOS](https://helixr1107v0xdeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-heads-main-be1a20d5b78e45c39c/System.Net.Http.Functional.Tests/1/console.7bbcc8f9.log?helixlogtype=result) in main build 1590723. These failures do not establish a receive-window overflow. Retain the existing maximum-credit, payload-length, unexpected-frame and PING-flood checks. Add a focused theory that sends exactly one update threshold of nonfinal DATA, stops sending, then checks the target stream's WINDOW_UPDATE restores credit to exactly 654321. Initial windows 327161 and 654321 cover one-byte-over-cap doubling and replenishment at the cap. A zero scaling multiplier removes dependence on bandwidth; the complete response bytes are also verified. ## Validation Windows x64, CoreCLR Release and libraries/tests Debug, using a short `subst` path: - `build.cmd clr+libs -rc release`: succeeded, zero warnings/errors. - Full `SocketsHttpHandler_Http2FlowControl_Test` class with `/p:Outerloop=true`: **11 passed, 0 failed, 0 skipped**, after restoring all diagnostic changes. - New exact-credit theory repeated ten times: **20 passed, 0 failed, 0 skipped**. - Controlled stale-assertion reproduction: temporarily start the original helper at the cap. The old heuristic fails with the CI child `Assert.Null` signature; the corrected helper passes the identical setup. This diagnostic setup is not included in the commit. - Broken-cap negative control: temporarily remove `Math.Min` and its adjacent product `Debug.Assert` (so the assertion does not preempt the test oracle). The new growth case fails with **expected 654321, actual 654322**; the at-cap case passes. Both product changes were restored, the product rebuilt, and the full class rerun successfully. Targeted command from the repository root: ```powershell .\.dotnet\dotnet.exe build src\libraries\System.Net.Http\tests\FunctionalTests\System.Net.Http.Functional.Tests.csproj /t:Test /p:RuntimeConfiguration=Release /p:Outerloop=true '/p:XUnitOptions=-class System.Net.Http.Functional.Tests.SocketsHttpHandler_Http2FlowControl_Test' ``` The unchanged original test passed once locally; its CI failure is intermittent. macOS execution and the broader HTTP functional suite were not run locally. No CI reruns or test disabling were used. > [!NOTE] > This PR and its description were generated with GitHub Copilot. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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Tagging subscribers to this area: @karelz, @dotnet/ncl |
ManickaP
approved these changes
Sep 16, 2026
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/ba-g test failure is #132059 |
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Test only change => tell mode, approved by Karel |
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Backport of #133942 to release/11.0
/cc @rzikm
Test-only change to clean up CI