http2: fix issues with aborted `respondWithFile()`s
Fixes: https://github.com/nodejs/node/issues/20824 Fixes: https://github.com/nodejs/node/issues/21560
@budarin @daaitch @ariran5 Are you in a position to try this patch and see whether it fully resolves the issues you were experiencing?
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines