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Don't block on cancellation in Http1ServerStage #5118

merged 2 commits into from Aug 29, 2021


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In Cats-Effect 3, cancellation applies backpressure on completion of the finalizer. If a response can't be canceled, the cancellation task does not complete. Beginning in http4s-0.23, we started running this cancellation token synchronously in Http1ServerStage. The result is that an uncancelable response can lock up the TickWheelExecutor's scheduler thread. Unhandled scheduled events may continue to pile up until OOM.

This runs cancellation asynchronously, as was done before http4s-0.23. The test demonstrates that scheduling continues even after the cancellation of an uncancelable request.

Fixes #5116.

@rossabaker rossabaker added bug Determined to be a bug in http4s module:blaze-server labels Aug 28, 2021
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Oh good I made another flaky Blaze test.

It went red-to-green, reliably, on my laptop.

@rossabaker rossabaker merged commit d1988cd into series/0.23 Aug 29, 2021
@rossabaker rossabaker deleted the issue-5116 branch August 29, 2021 21:45
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bug Determined to be a bug in http4s module:blaze-server
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