GH-420: avoid spurious exceptions on closing forwarded channel #422
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Fix Nio2Session.doCloseGracefully(): before calling AsynchronousSocketChannel.shutdownOutput(), check that the socket is still open, and if we get an IOException all the same, log it with TRACE level. See also comments in doShutdownOutputStream(). Bug: apache#420
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Fix
Nio2Session.doCloseGracefully(): before callingAsynchronousSocketChannel.shutdownOutput(), check that the socket is still open, and if we get anIOExceptionall the same, log it with TRACE level. See also comments indoShutdownOutputStream().Fixes #420.