http: don't emit 'readable' after 'close'
An edge case could emit 'readable' after 'close' and 'close' before 'end'.
Refs: #28710 (closed)
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines